LAB GRUPPEN 3000 Watt Two Channel Amplifier with DSP Control User Guide

LAB GRUPPEN 3000 Watt Two Channel Amplifier with DSP Control User Guide

 **Quick Start Guide**

PDX3000
3000 Watt Two Channel Amplifier with DSP Control

Important Safety Instructions

Terminals marked with this symbol carry electrical current of sufficient magnitude to constitute risk of electric shock. Use only high-quality professional speaker cables with ¼” TS or twist-locking plugs pre-installed. All other installation or modification should be performed only by qualified personnel.

This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure – voltage that may be sufficient to constitute a risk of shock.

This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read the manual.

Caution To reduce the risk of electric shock, do not remove the top cover (or the rear section). No user serviceable parts inside. Refer servicing to qualified personnel.

Caution To reduce the risk of fire or electric shock, do not expose this appliance to rain and moisture. The apparatus shall not be exposed to dripping or splashing liquids and no objects filled with liquids, such as vases, shall be placed on the apparatus.

Caution These service instructions are for use by qualified service personnel only. To reduce the risk of electric shock do not perform any servicing other than that contained in the operation instructions. Repairs have to be performed by qualified service personnel.

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Use only attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
15. The apparatus shall be connected to a MAINS socket outlet with a protective earthing connection.
16. Where the MAINS plug or an appliance coupler is used as the disconnect device, the disconnect device shall remain readily operable.
17. Correct disposal of this product: This symbol indicates that this product must not be disposed of with household waste, according to the WEEE Directive (2012/19/EU) and your national law. This product should be taken to a collection center licensed for the recycling of waste electrical and electronic equipment (EEE). The mishandling of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the efficient use of natural resources. For more information about where you can take your waste equipment for recycling, please contact your local city office, or your household waste collection service.
18. Do not install in a confined space, such as a book case or similar unit.
19. Do not place naked flame sources, such as lighted candles, on the apparatus.
20. Please keep the environmental aspects of battery disposal in mind. Batteries must be disposed-of at a battery collection point.
21. Use this apparatus in tropical and/or moderate climates.

LEGAL DISCLAIMER

Music Tribe accepts no liability for any loss which may be suffered by any person who relies either wholly or in part upon any description, photograph, or statement contained herein. Technical specifications, appearances and other information are subject to change without notice. All trademarks are the property of their respective owners. Midas, Klark Teknik, Lab Gruppen, Lake, Tannoy, Turbosound, TC Electronic, TC Helicon, Behringer, Bugera, Auratone and Coolaudio are trademarks or registered trademarks of Music Tribe Global Brands Ltd. © Music Tribe Global Brands Ltd.

2019 All rights reserved.

LIMITED WARRANTY

For the applicable warranty terms and conditions and additional information regarding Music Tribe’s Limited Warranty, please see complete details online at musictribe.com/warranty.

Zhongshan Eurotec Electronics Limited

No. 10 Wanmei Road, South China Modern Chinese
Medicine Park, Nanlang Town, 528451, Zhongshan City,
Guangdong Province, China

1. Introduction

1.1 Welcome

Thank you for choosing a Lab. grippe PDX Series product. This manual provides a comprehensive guide to the features and functionality of PDX Series model PDX3000andPDX2000amplifiers.We highly recommend you read through this manual in its entirety to become fully acquainted with configuration options and protection circuitry. As you become thoroughly familiar with all aspects of operation, you may learn of features or options that will affect your choices on amplifier modes or loudspeaker system configuration.

Lab.gruppen PDX Series power amplifiers are designed and built with competitive price and good performance and protection features in mind. Although the PDX Series features a competitive price, each amplifier draws on the engineering that has made Lab. grippe the benchmark of quality for touring concert systems: exceptional sonic performance, rugged construction, proven reliability, and protection features that anticipate every un welcome possibility – that is the core of the “Show must go on” design philosophy that every Lab.gruppen product is created with, with a well matched feature set per product range depending on the expected application. This manual was created for the PDX Series 3000 and 2000 amplifier models. Any references to “PDX Series” in this manual refer to all models in the range.

1.2 Features

Your new PDX Series amplifier incorporates a number of sophisticated technologies – many of them proprietary to Lab.gruppen – that ensure the best
possible performance and years of reliable operation. Familiarizing yourself with these technologies will prove invaluable in setting up and optimizing your
loudspeaker system.

1.3 Class D output stage

All PDX Series amplifiers employ our unique IDEEA Class D output stage that is ideally matched to the rated power output. To provide flexibility, each channel offers sufficient voltage swing and current capacity to drive loads in any impedance without any additional configuration. In order to have low thermal losses as well as a high voltage swing, the design is based on a permanently bridged output.

1.4 Protection and performance optimization

Appropriate and reliable power amplification is vital to any audio system. Inadequate or faulty power amplifiers could cause damage to loudspeakers, or in some cases to the power amplifiers themselves. To prevent damage or service interruptions, PDX Series amplifiers offer advanced features to protect both internal circuits and connected loads. These features are part of the Lab.gruppen philosophy “Show must go on”.

Standard on the PDX Series protection features include:

• CPL (Current Peak Limiter) ensures that the amplifier’s output does not exceed the safe current handling parameters of the amplifier components.
• Temperature protection ensures that the amplifier will not be damaged by exceeding thermal limits. The RDY LED flashes orange when the amplifier approaches thermal limits to allow user action before protective muting engages.
• DC protection ensures destructive DC signals will not appear at the amplifier outputs. If such conditions occur an internal fuse opens.
• RSL (Rail Sensing Limiter) is applied to avoid distortion at the selected voltage limit threshold and to avoid hitting the rail if it has sagged below the configured threshold. Limiting also may be applied when maximum output current has been reached or when the mains voltage is too low to maintain required rail voltage. Limiting activity is shown by the front panel Limiter LED

1.5 DSP features and PDX controller software

PDX series feature a comprehensive DSP functions such as crossover, parametric EQ, delay, limiter, dynamic EQ and input mixing, making the PDX series suitable for a broad range of installed and touring applications. The PDX series can be controlled through the usage of front panel or PDX Controller software by connecting to a PC with USB.

1.6 Unpacking and visual checks

Every Lab.gruppen amplifier is carefully tested and inspected before leaving the factory and should arrive in perfect condition. If any damage is discovered, please notify the shipping carrier immediately. Save the packing materials for the carrier’s inspection and for any future shipping.

1.7 Cooling

The PDX Series devices use a forced-air cooling system with front to rear airflow, allowing high continuous power levels without thermal problems. Please ensure that there is sufficient space in the front and rear of each amplifier to allow free flow of air, no doors or covers should be mounted either in the front or rear of the amplifiers.
Amplifiers may be stacked directly on top of each other with no spacing, though some spacing may enable more convenient installation of rear cabling. Fit solid blanks (not ventilation blanks) to unused rack spaces to ensure effective air circulation. Leaving gaps in between items of equipment degrades the effectiveness of forced-air cooling.

1.8 Operating voltage

Always connect your PDX amplifier to the voltage specified on the rear of the device. Connecting the amp to an incorrect voltage can permanently damage your amp.

• USA / Canada / Japan = 100-120 V~, 50/60 Hz
• UK / Australia / Europe / Korea / China 220-240 V~, 50/60 Hz

The locking IEC receptacle on the rear panel accepts the supplied IEC cord which terminates in a connector appropriate for the country of sale.

2. Control

2.1 Front Panel

The following indicators and controls are available on the front panel (Fig. 1):

• (1) RACK EARS secure the unit into a rack using four attaching screws and washers (fasteners not included). The height requires two rack units.
• (2) VENTILATION openings allow front-to-rear air circulation to prevent overheating.
• (3) INPUT CONTROLS adjust the input level for each channel. To attenuate the input signal, rotate the knobs counter-clockwise.
• (4) PROCESS button steps through the DSP processing modules.
• (5) SETUP button accesses basic device configuration functions such as presets, panel lock, device name and screen contrast.
• (6) LEVEL LEDs display the signal level for each channel. Reduce the input gain if a channel’s red LIM LED lights up continuously.
• (7) LCD SCREEN displays the current DSP module and parameter settings.
• (8) UP/DOWN buttons navigates through menus by stepping up/down through parameters.
• (9) EXIT button acts as a “back” button and takes you back one step in the menu hierarchy per press.
• (10) SELECT encoder knob toggles between Graphic and Edit modes (when pressed) and changes parameter values (when rotated).
• (11) POWER button turns the amplifier on and off.

2.2 Rear Panel

The following connectors are available on the rear panel (Fig. 2):

• (12) BREAKER (automated fuse) acts in place of common discard able fuses. After eliminating the cause of faulty operation, simply depress the BREAKER and power
  up the unit again.
  BREAKER WARNING: Take the following actions BEFORE resetting the breaker:
  • Unplug the AC main cable
  • Press the POWER button to the extended “OFF” position
  • Turn all input gain control elements down
  • And then, reset the breaker, connect the unit to the mains, switch ON and slowly increase the gain to the target volume.

• (13) POWER SOURCE locking connector accepts the included IEC power cord.

• (14) VENTILATION FAN speed adjusts automatically depending on temperature to ensure trouble-free operation.

• (15) SPEAKER OUTPUTS connect the amplifier to the speakers using professional speaker cables with twist-locking speak ON plugs. Both output channels are available by using a 4-pole connector and cable with the CHANNEL A output. CHANNEL B is available separately on the right-hand CHANNEL B output.
  WARNING! Bridge Mode is not supported!
  WARNING! Do not connect any output connector poles to ground!

• (16) BALANCED INPUTS (¼ ” connections) accept audio inputs for each channel from audio cables with ¼ ” TRS connectors (balanced) or ¼ ” TS connectors (unbalanced).

• (17) BALANCED INPUTS (XLR connections) accept balanced audio inputs for each channel from audio cables with XLR connectors.
  NOTE : The XLR and ¼ ” connections in the BALANCED INPUTS section are physically linked, and users can use this physical connection to route a copy of the input
  signal to an additional amplifier. For example, a signal coming in to Channel A through the XLR connection can be split and routed back out over Channel A’s ¼ ” TRS connection.

• (18) USB connection enables firmware updates and control over parameters via computer. Please visit labgruppen.com to download the PDX Controller software for your computer.

3. DSP Configuration

3.1 Default configuration

PDX Series amplifiers are shipped with default DSP settings that allow immediate use in many common applications with no need for further DSP configuration.
The default mode is suited for use with stereo program material into full range loudspeakers.

3.2 Signal flow block diagram

The block diagrams below (Fig. 3) show the available signal-flow configurations from inputs to outputs

All of these configurations are available through both the Front Panel interface (see pg. 14) and the PDX Controller software (see pg. 22).

3.3 Front panel configuration

Input mixing and routing, as well as all DSP parameters, may be configured using the PROCESS button, SETUP button, UP/DOWN buttons, EXIT button and the SELECT
rotary encoder. The following menu tree (Fig. 4) is keyed to points in the signal flow.

Fig. 4: Front Panel Menu Tree

4. DSP Processor

4.1 Processor Functionality

The PDX DSP processor manipulates your signal in the digital domain, offering tremendous flexibility and control. You may control and program the DSP processor via either the PDX amplifier’s front panel or remotely by computer using the PDX Controller software (available for download from labgruppen.com).
By using the DSP processor, you can program all amplifier functions and parameters—except for the CH A and CH B input attenuation settings, which can only be
controlled using the CH A / CH B knobs on the amplifier’s front panel.

4.2 Front Panel control

The following material describes the DSP’s screen organization and how to program the processor’s various functions by manipulating your PDX amplifier’s front panel controls.
Main top-level screen
The top-level screen displays the model name for your specific unit..

4.3 SETUP screens

The SETUP screens access the preset, panel lock, device naming, and LCD screen contrast functions. To access these functions, press the SETUP button, and then move up and down through the top-level screens by pressing either the SETUP button or the UP / DOWN arrow buttons.

4.3.1 SETUP 1/4: Load Preset

The top-level Load Preset screen displays the current Preset name (up to 10 characters) and Preset number (1–20). Subsidiary screens offer options for loading, saving, and naming Presets

Below the Preset name, this screen displays the “Load Preset” option by default. Rotate the SELECT encoder clockwise to access the “Save Preset” option.

Note : Preset #1:INIT_DATA cannot be overwritten. Select this preset any time you want to restore the amp’s default settings.

Loading a Preset

1. Make sure the “Load Preset” option appears on the screen. (Rotate the SELECT encoder to toggle between “Load Preset” and “Save Preset.”)

2. Press the SELECT encoder knob to access the DSP’s internal Preset list on the next sub-screen. The correct sub-screen will display the LOAD PRESET option in the upper right-hand corner of the screen.

3. Scroll up and down through the Preset list by rotating the SELECT encoder knob. As you scroll, the Preset number will appear to the left below the disk icon.

4. To load the selected Preset, you may either press the SELECT encoder or press the UP arrow button.

Saving a preset

1. Make sure the “Save Preset” option appears on the screen. (Rotate the SELECT encoder to toggle between “Load Preset” and “Save Preset.”)

2. Press the SELECT encoder knob to access the DSP’s internal Preset list on the next sub-screen. The correct sub-screen will display the EDIT TITLE and SAVE PRESET
   options on the right-hand side of the screen.

3. Scroll through the list until you find an EMPTY Preset slot or another Preset you wish to overwrite.

4. If you wish to edit your Preset title before saving, press the UP arrow button to choose the EDIT TITLE option.

5. Edit the Preset title (see “Editing the Preset” title below).

6. Select the SAVE PRESET option by pressing the DOWN arrow key.

Editing a Preset title

1. Make sure the “Save Preset” option appears on the screen. (Rotate the SELECT encoder to toggle between “Load Preset” and “Save Preset.”)

2. Press the SELECT encoder knob to access the DSP’s internal Preset list on the next sub-screen. The correct sub-screen will display the EDIT TITLE and SAVE PRESET options on the right-hand side of the screen.

3. Scroll through the Preset list by rotating the SELECT encoder knob.

4. Select a Preset slot as a save destination by pressing the SELECT encoder knob.

5. Press the UP arrow button to select the EDIT TITLE function. The EDIT TITLE window will appear, with alphanumeric characters in a row at the top and the current title directly below with the editing cursor.

6. Select the backward arrow from the row of characters by rotating the SELECT knob until the backward arrow is highlighted.

7. Press the SELECT encoder knob to erase characters. The cursor will erase characters from right to left across the existing title.

8. Rotate the SELECT encoder to select new characters from the row above the current Preset title.

9. Insert selected characters into the Preset title by pressing the SELECT encoder knob. Once you select and insert a character, the editing cursor will change direction and advance from left to right.

10. Save the new Preset title by pressing the DOWN arrow key to activate the SAVE PRESET function.

4.3.2 SETUP 2/4: Panel Lock

The Panel Lock function uses a 4-character alphanumeric access code to lock the front panel controls and prevent unauthorized changes to DSP settings. Current settings can still be viewed while the unit is locked, but the parameters cannot be changed. The amplifier can only be locked or unlocked from the Panel Lock screen.

Locking the amplifier

1. Go to the Panel Lock screen by pressing the SETUP button.

2. Press the SELECT encoder knob to access the password screen.

3.  et an access code by using the SELECT encoder knob. Rotate the knob to scroll through the character list, and then select characters by pressing. With each press on the SELECT encoder knob, the password cursor will advance left to right by one space.

4. The amplifier will automatically lock when you select the final character for the access code. The display will flash a brief confirmation message: “Device Locked!”

5. The status displayed on the Panel Lock screen will state “LOCKED!”

Unlocking the amplifier

1. Go to the Panel Lock screen by pressing the SETUP button.
2. Press the SELECT encoder knob to access the password screen.
3. Enter the access code by using the SELECT encoder knob. Rotate the knob to scroll through the character list, and then select characters by pressing. With each press on the SELECT encoder knob, the password cursor will advance left to right by one space.
4. The amplifier will automatically unlock when you select the final character for the access code. The display will flash a brief confirmation message: “Unlocked.”
5. The status displayed on the Panel Lock screen will state “OFF.”

NOTE: Connecting the amplifier to a PC via USB allows the user to unlock the device should the password be forgotten. This function is performed through the PDX
Controller software.

4.3.3 SETUP 3/4: Device Name

Each PDX DSP amplifier can be individually named for easy identification within a rack or remotely via the PDX Controller software.

Naming the amplifier

1. Access the Device Name screen by pressing the SETUP button.
2. Press the SELECT encoder knob to access the editing screen.
3. Choose the backwards arrow by turning the SELECT knob and press it to delete the existing characters of the current preset name.
4. Rotate the SELECT encoder to select new characters from the row above the current amplifier name.
5. Insert selected characters into the new amplifier name by pressing the SELECT encoder knob. Once you select and insert a character, the editing cursor will change direction and advance from left to right.
6. Save the new amplifier name by pressing the DOWN arrow key to activate the SAVE TITLE function.

4.3.4 SETUP 4/4: Contrast

The Contrast screen allows you to adjust the LCD screen’s contrast level. The Contrast parameter ranges from 1–30, with 30 representing maximum contrast. Rotate the SELECT encoder knob to adjust the Contrast setting.

4.4 PROCESS screens

Pressing the PROCESS button opens up the various screens that determine the signal path setup and that control processing parameters for the DSP modules: I/O, PEQ, XOVER, DEQ, DELAY, and LIMIT.
You can move between top-level module screens by pressing the PROCESS button.

4.4.1 I/O

The I/O module sets up the signal routing inside the DSP from input to output. Press and rotate the SELECT encoder knob to choose between dual mono, stereo, or bi-amped options.

DUAL

DUAL (dual mono) mode routes each channel input, A and B, through completely separate parallel signal paths with independent outputs for each channel. Each channel may be processed with its own unique filter, equalization, signal delay, and limiter settings.

STEREO

STEREO mode routes the signal from both the A and B inputs through a single series of DSP modules. The parallel DSP modules process the A and B signals with identical, linked settings (only module “A” parameter settings appear on subsequent DSP module screens).

BIAMP1

BIAMP1 mode splits the Channel A input signal at a programmable frequency point, and then routes the resulting high and low frequency signals through a parallel chain of DSP modules with independent equalization, signal delay, and limiter settings. In BIAMP1 mode, Output A routes low frequencies to a low- range speaker, while Output B connects to a high-frequency transducer.

BIAMP2

BIAMP2 mode operates identically to BIAMP1 mode, except that the output signals are swapped between Outputs A and B (i.e., Output B handles low frequencies while Output A handles high frequencies). The swapped A and B output routing allows the user to quickly correct reversed high/low speaker connections without having to physically access the amplifier’s back panel and manually change the speaker connection.

4.4.2 PEQ

The PEQ module deploys up to eight EQ bands for precise sound sculpting. The EQ bands can each be switched between low shelving, high shelving, and parametric modes. For the high shelving and low shelving EQ bands, the LS12 and HS12 settings provide steeper equalization curves than the LS6 and HS6 settings. The main PEQ screen displays the composite equalization curve across the frequency spectrum

Programming equalizers

1. Choose individual equalizers by rotating the SELECT encoder knob. As you rotate the SELECT encoder knob, dotted vertical lines will appear at different points within the frequency spectrum, and the EQ band name will appear in the lower-left corner of the screen (e.g., A#1, A#2, B#1, B#2, and so on).

2. Press the SELECT encoder knob to enter the parameter screens for your chosen EQ band.

3. Press the UP / DOWN arrow keys to switch between parameters. The chosen parameter will appear highlighted.

4. Rotate the SELECT encoder knob to change parameter values.

5. Choose the equalizer type (Type): OFF, PEQ (parametric), low shelving (LS6, LS12), or high shelving (HS6, HS12).

6. Set the frequency (Freq) for each EQ band by rotating the SELECT encoder knob. The programmed frequency can represent either the center frequency for parametric mode, or the cutoff frequency for low and high shelving modes.

7. Set the EQ band’s cut or boost (Gain) by rotating the SELECT encoder knob.

8. For parametric mode, control the width of the parametric curve by tweaking the Q parameter. High Q values produce a narrow, steep curve, while low Q values create a wide curve with a gentle slope.

9. Press the SELECT encoder knob or the EXIT button to return to the top-level PEQ screen.

4.4.3 XOVER

The XOVER module offers programmable pairs of high- and low-pass filters. STEREO mode offers only one filter set (A#1). DUAL, BIAMP1, and BIAMP2 modes use two filter sets (A#1 and B#1), and in BIAMP1 and BIAMP2 modes, these two sets of filters may be linked. On the top-level screen, vertical dotted lines indicate the threshold point for each filter.

Each low-pass and high-pass filter also offers multiple options for filter type and slope: OFF, Butterworth (BUT6, BUT12, BUT18, BUT24, BUT48), Bessel (BES12, BES24), or Lackwits-Riley (LR12, LR24, LR48).

Programming filters/bi-aping crossover

1. Choose between filter sets A#1 and B#1 by rotating the SELECT encoder knob (DUAL, BIAMP1, and BIAMP2 modes only).

2. Press the SELECT encoder knob to enter the parameter screens.

3. Move up or down between parameters by pressing the UP / DOWN arrow buttons.

4. Choose between filter types for high-pass (HP type) and low-pass (LP type) by rotating the SELECT encoder knob.

5. Set the filter thresholds for high-pass (HP freq) and low-pass (LP freq) by rotating the SELECT encoder knob.

6. Set the filter’s overall signal gain (Gain) by rotating the SELECT encoder knob.

7. Set the link parameter (Link AB) to ON or OFF by rotating the SELECT encoder knob (BIAMP1 and BIAMP2 modes only).

8. Press the SELECT encoder when finished to return to the top-level XOVER screen.

4.4.4 DEQ

The DEQ module deploys a dynamic EQ that is triggered by a programmable signal threes old. For example, you can program the dynamic EQ to cut or boost increasing amounts of mid frequencies as the signal gets louder beyond your preferred threshold.

STEREO mode features one set of dynamic EQs (A#1 and A#2), while DUAL, BIAMP1, and BIAMP2 modes feature two sets of dynamic EQs (A#1, A#2, B#1, and B#2). Each dynamic EQ may be set to OFF, band-pass (BP), low-pass (LP6, LP12), and high-pass (HP6, HP12).

Programming dynamic EQs

1. Choose between dynamic EQ sets by rotating the SELECT encoder knob.

2. Press the SELECT encoder knob to enter the parameter screens.

3. Move up or down between parameters by pressing the UP / DOWN arrow buttons.

4. Choose between EQ types (Type) by rotating the SELECT encoder knob.

5. Set the frequency (Freq) for each EQ by rotating the SELECT encoder knob. The programmed frequency can represent either the center frequency for band-pass mode, or the threshold frequency for low- and high-pass modes.

6. For band-pass mode, control the width of the band-pass curve by tweaking the Q parameter. High Q values produce a narrow, steep curve, while low Q values create a wide curve with a gentle slope.

7. Set the dynamic equalizer’s cut or boost (Gain) by rotating the SELECT encoder knob.

8. Set the signal threshold (Thresh) by rotating the SELECT encoder knob.

9. Program your desired ratio (Ratio). Similar to a compressor, higher ratio values yield a more intense equalization effect.

10. Adjust attack (A time) and release (R time) to your preferred values.

11. Press the SELECT encoder when finished to return to the top-level DEQ screen.

4.4.5 DELAY

The DELAY DSP module digitally slows the final signal output from the amplifier by a programmable amount (expressed as either distance or time). This signal delay helps prevent phase and synchronization problems caused by sound traveling through air over long distances, e.g., between speaker arrays separated by long distances or between a performance stage and distant sound reinforcement speakers.

Programming signal delay

1. Choose between signal paths (A#1, B#1) by rotating the SELECT encoder knob.

2. Press the SELECT encoder knob to enter the parameter screens.

3. Move up or down between parameters by pressing the UP / DOWN arrow buttons.

4. Choose between 0° and 180° phase (PHASE) by rotating the SELECT encoder knob.

5. Choose your amount of signal delay (Delay) by rotating the SELECT encoder button.

6. Fine tune the Delay value using the (fine) parameter.

7. Change the delay’s unit of measure (Unit), if necessary, by rotating the SELECT encoder knob. The delay value can be expressed in milliseconds (MS), meters (m), or feet (ft.).

8. Press the SELECT encoder when finished to return to the top-level DELAY screen.

4.4.6 LIMIT

The LIMIT DSP module controls the unit’s output limiter, with programmable parameters for threshold (Thresh), release (R time), and hold (Hold).
The top-level LIMIT screen always displays the threshold (Thresh) setting for quick reference.

Programming the output limiter

1. Choose between signal paths (A#1, B#1) by rotating the SELECT encoder knob.
2. Press the SELECT encoder knob to enter the parameter screens.
3. Move up or down between parameters by pressing the UP / DOWN arrow buttons.
4. Choose a threshold (Threes) setting by rotating the SELECT encoder knob.
5. Choose a release time (R time) by rotating the SELECT encoder knob.
6. Choose a hold (Hold) setting by rotating the SELECT encoder knob.
7. Press the SELECT encoder when finished to return to the top-level LIMIT screen.

5. PDX Controller Software

The PDX Controller software allows the user to control all PDX DSP settings remotely from a computer via the USB connection located on the PDX rear panel.

5.1 Meters

Monitor input and output levels by using the virtual meters on the right hand side of the control software screen. Adjust input levels using the knobs on the amplifier’s front panel.

5.1.1 Input / Output Meters

The input meters show the signal level at the CH A and CH B inputs. If the input signal exceeds the 0 dB level, the red Clip indicator will light over the channel experiencing an overload.
The input level can only be controlled by using the CH A and CH B knobs on the front panel of the PDX amplifier. The PDX Controller software does not control the input level.

5.2 Connection Status

5.3 Function Tabs

The PDX Controller window allows the user to access DSP functions via embedded tabs accessible near the top of the software window.

The software window includes these tabbed screens:

• Setup —manages presets and networking options.
• Configuration —controls the amplifier Mode setting for Dual Mono, Stereo, and other routing options, as well setting controls for output delay and limiting.
• Filter/Crossover —offers control over adjustable hi-pass and lo-pass filters. In Bi-Amp 1 and Bi-Amp 2 configuration, this tab controls the crossover point for splitting the blended, mono input signal into separate high- and low-frequency mono signals for beaming.
• Parametric EQ —controls up to 8 adjustable parametric and shelving EQs for each channel.
• Dynamic EQ —adjusts parameters for 2 bands of level-dependent, dynamic equalization per channel.

5.3.1 Setup

The Setup tab allows you to manage connections and settings for your PDX amps. Amp presets may be stored either on the PDX DSP or on the PC (presets stored on your PC may then be loaded onto any PDX amplifier).

PC Presets

The PC Presets section allows you to store PDX DSP presets on your computer instead of the PDX amp’s internal memory. The Load function allows you to upload presets from the computer, while the Save function stores the current PDX DSP settings to the computer (these fi les use apex filename extension).

Amp Presets

The Amp Presets section allows you to access and manage presets stored in the PDX amp’s internal memory. The amp’s internal memory holds up to 20 presets, and these 20 preset slots appear in the Amp Presets section as a numbered, double-column list showing the preset name and the preset’s signal routing configuration (DUAL, STEREO, BIAMP1, and so on). The preset currently in use will display an illuminated dot immediately to the preset’s left.
Note : Preset #1:INIT_DATA cannot be overwritten. Select this preset any time you want to restore the amp’s default settings

Recalling a preset stored in the amp’s internal memory

1. Click on the desired preset in the Amp Presets list. The dot to the immediate left of the selected preset will light up.
2. Click on the Recall button in the upper left of the Amp Presets section. The selected preset’s name will appear in the text box next to the Recall button. All settings contained in the preset will automatically deploy.

Saving a preset to the amp’s internal memory

1. Select a destination for the preset by clicking on a slot in the preset list. (If you save your preset to a slot already holding a stored preset, the stored preset will be replaced by your new preset.)
2. Type your new preset’s name into the text box to the right of the Recall button.
3. Click on the Store button to store your preset in the selected slot in the preset list. Your new preset’s name will appear in the selected slot in the preset list.

Amp Connection

The Amp Connection section tells you which PDX amplifier you have connected to the software, as well as options for naming your PDX amp and for setting up a code to lock the amplifier’s front panel and prevent tampering (the amp can still be edited from your laptop using the PDX Controller software). For the current edition of the PDX Controller software, only one PDX amplifier can appear at any one time in the amplifier list and be recognized by the software.

Connecting to an amplifier
◊ this procedure assumes you already have an PDX amplifier connected to your computer, and that you are switching to another PDX amplifier. Usually, the PDX Controller software will automatically detect a USB-connected PDX amp and then ask if you wish to connect to the detected amplifier.

1. Click on the Connect button near the bottom of the Amp Connection section of the Setup tab. The software will disconnect from the current amplifier, clear the amplifier from the list in the Amp Connection section, and clear all presets from the Amp Presets list.
2. Press the Refresh button near the top of the Amp Connection section, above and to the left of the amplifier list window. When the software finds your newly connected PDX amp, the amplifier will appear in the amplifier list window, and the amp’s internal presets will populate the Amp Presets list. The software will also launch a confirmation window asking if you wish to connect to the detected amplifier.
3. Press the Connect button in the confirmation window to finalize the connection.

Renaming an amplifier

1. Type the new amplifier name directly into the text box to the left of the Rename Amp virtual button near the bottom of the Amp Connection section.
2. Click on the Rename Amp virtual button. The new amplifier name will appear in the Amp Name column of the amplifier list.

Locking the amplifier

1. Type a 4-character lock code of your choosing directly into the Lock Code window near the bottom of the Amp Connection section. The Lock function requires a new lock code every time you lock the amplifier.
2. Click on the Lock virtual button at the bottom right of the Amp Connection section. The Lock virtual button will turn red to indicate the amplifier front panel has been locked.
3. Clear the 4-character code from the Lock Code window if you desire extra security.

Unlocking the amplifier

1. Type the amplifier’s 4-character lock code into the Lock Code window near the bottom of the Amp Connection section.
2. Click on the Unlock virtual button located directly to the right of the Lock Code text box. The Unlock virtual button will light up blue to indicate the amplifier is unlocked, while the Lock button will change colors from red to gray. The characters in the Lock Code text box will disappear and be replaced by asterisks.

5.3.2 Configuration

The Configuration tab displays two main sets of software controls:

• ode —controls the amplifier configuration. Choose between Dual Mono, Stereo, Bi-Amp 1, and Bi-Amp2 configurations. Each configuration’s complete signal path appears in the display window, including the arrangement of internal DSP modules and speaker outputs.
• Delay/Peak Limiter —controls settings for the Delay and Limit DSP modules, as well as options for channel phase, Load settings (in Ohms) for the limiter wattage display, Hold and Release for the Limiter, and channel linking. The number of Delay/Peak Limiter controls change depending on the amplifier Mode configuration.

Mode

Changing amplifier mode
The amplifier mode can be changed by clicking on the button for your desired routing option along the left-hand side of the window. When you click on a mode button, the software will launch a confirmation window. Click “Yes” in the confirmation window to launch the new amplifier mode, and the new signal path will appear in the display.

Mode descriptions

Dual Mono

Dual Mono mode routes each channel input, A and B, through completely separate parallel signal paths with independent outputs for each channel. Each channel may be processed with its own unique filter, equalization, delay, and limiter settings. The Delay and Limit modules for A and B can be linked and programmed with identical settings by clicking on the Channel Link button below the Mode window.

Stereo

Stereo mode routes the signal from both the A and B inputs through a single series of DSP modules. Each DSP module processes both the A and B signals with identical, linked settings. The linked Delay and Limit parameters can be controlled from Stereo mode’s consolidated Channel A+B control window (which displays automatically when Stereo mode is selected).

Bi-Amp 1

Bi-Amp 1 mode splits the Channel A input signal in the X Over DSP module at a programmable frequency point, and then routes the resulting high and low frequency
signals through a parallel chain of DSP modules with independent equalization, delay, and limiter settings. The Delay and Limit modules for the split high and low frequency signals can be linked and programmed with identical settings by clicking on the Channel Link button below the Mode window. In Bi-Amp 1 mode, Output A routes low frequencies to a low-range speaker, while Output B connects to a high-frequency transducer.

Bi-Amp 2

Bi-Amp 2 mode operates identically to Bi-Amp 1 mode, except that the signals are swapped between Outputs A and B (i.e., Output B handles low frequencies while Output A handles high frequencies). The swapped A and B output routing allows the user to quickly correct reversed high/low speaker connections without having to physically access the amplifier’s back panel and manually change the speaker connection

Delay/Peak Limiter

Channel Link
In Dual Mono, Bi-Amp 1, and Bi-Amp 2 modes, the Channel Link virtual button will appear just above the Delay and Peak Limiter controls. When you click on the Channel Link virtual button, the button will light up, and the Delay and Peak Limiter controls for both channels will display identical values.

Delay
The Delay function digitally slows the final signal output from the amplifier by a programmable amount (expressed as either distance or time). This signal delay helps prevent phase and synchronization problems caused by sound traveling through air over long distances, e.g., between speaker arrays separated by long distances or between a performance stage and distant sound reinforcement speakers. The Delay controls also simultaneously display the amount of signal delay in milliseconds (MS), meters (m), and feet (ft.), which can be useful if you already know the precise distance between speakers.

Programming signal delay

1. Program the signal delay by using either of these two methods:
   a) Rotate the Delay virtual knob clockwise until you achieve a suitable amount of signal delay. The MS, m, and ft. text boxes will each display equivalent values as you rotate the virtual knob.
   b) Type a delay value directly into one of the text boxes below the Delay virtual knob (MS, m, or ft., depending on your preference). The Delay virtual knob will rotate to a position matching the delay value you have entered.

2. Choose between 0° and 180° phase either by clicking on the Phase virtual button or by clicking directly on 0° or 180° directly below the virtual button. When the Phase virtual button is engaged, the virtual button will light blue and the indicator next to 180° will light up.

Peak Limiter
The Peak Limiter helps protect your speakers by preventing signal spikes at the amplifier’s output stage.
The Peak Limiter controls include a dedicated virtual knob with matching numerical displays in dBs (decibels relative to full scale), VIP (Voltage(peak)), as well as a rating in Watts, which appears only when you choose an Ohm setting from the Load pulldown menu.
The PDX Controller software also allows you to see the amplifier’s total output as a rating in Watts. This Watt rating allows you to connect speakers with lower power ratings and then adjust the limiter to match the speakers’ maximum Watt rating.

Note: the PDX Controller software does not automatically detect or show the total speaker load connected to the amplifier.
Controls for Hold and Release times appear near the bottom of the window, each with a matching numerical display.

Programming the output limiter

1. Program the output limiter by using either of these two methods:
   a) Rotate the Peak Limiter virtual knob counter-clockwise until you find an adequate limiter setting for your sound system. The dBs (decibels relative to full scale) and VIP (Voltage [peak]) text boxes will each display equivalent values as you rotate the virtual knob.
   b) Type a limiter value directly into one of the text boxes below the Peak Limiter virtual knob (dBs or VIP). The Peak Limiter virtual knob will rotate to a position matching the delay value you have entered.

2. Choose a Load value from the Load pulldown menu (none, 2, 4, 8, or 16 Ohms) that matches the total combined load of all speakers connected to the amplifier’s outputs. If your combined speaker load in Ohms does not exactly match 2, 4, 8, or 16 Ohms, choose the next lower Ohm setting from the Load pulldown menu. When you select a Load setting, an additional Watt rating for the limiter will appear above the Load pulldown menu.

3. Choose a Hold value either by rotating the Hold virtual knob or by entering a value (in milliseconds) into the matching text box below the knob.

4. Choose a Release value either by rotating the Release virtual knob or by entering a value (in milliseconds) into the matching text box below the knob.

5.3.3 Filter/Crossover

The Filter/Crossover tab displays and controls Filter/X Over module settings in two formats:

• Frequency Curve —displays the filter curves in visual form, and allows click-and-drag manipulation of filter threshold points.
• Control View —allows parameter tweaks via virtual controls, as well as pull-down menus for filter type and slope.

The Frequency Curve and Control View interact with each other and simultaneously shift as you change parameters in either view.

Filter/Crossover Frequency Curve Display

The Frequency Curve displays a frequency range from 20 Hz to 20 kHz, with 15 dB of cut/boost displayed on the vertical axis. Within this graphic field, the filter curve appears as a solid, colored line running from left to right. The line shifts and moves to reflect changing parameter values entered using the virtual controls and pull-down menus. Dotted vertical lines indicate frequency threshold points for the various filters, numbered 1 through 4, and these threshold points can be selected and moved through the frequency spectrum using the mouse or trackpad.

Moving filter thresholds via click-and-drag

1. Click and hold on the numbered box at the top of the desired filter threshold line.
2. Drag the threshold line to the desired location on the frequency spectrum.
3. The filter curve shown by the solid line will move and adjust as you shift the threshold line. The virtual knob and frequency displayed in the Control View will also simultaneously change as you move the threshold line in the Frequency Curve.

Filter/Crossover Control View

The Control View of the Filter/Crossover tab contains virtual knob controls for Gain, High Pass filter, and Low Pass filter. Exact parameter values appear in boxes below each virtual knob. These parameters may be altered by either adjusting the virtual knobs or by entering values directly in the parameter boxes. Pull-down menus contain filter options for Type (Butterworth, Bessel, Lackwits-Riley) and Slope (6–48 dB/Octave).

X-Over option for beaming
In Bi-Amp 1 and Bi-Amp 2 modes, the X-Over button appears on the Filter/Crossover tab. Activating the X-Over button links the Low Pass 2 and High Pass 3 filter controls and automatically creates a synchronized crossover point for bi-amped low frequency and high frequency signals.

Setting a linked crossover frequency

1. Activate the Bi-Amp 1 or Bi-Amp 2 settings on the Configuration tab.

2. Click on the Filter/Crossover tab.

3. Click on the X-Over button on the Filter/Crossover tab. The X-Over button will light up and overlapping filter curves will appear in the Frequency Curve.

4. Set the crossover frequency by any of these methods:
   a) drag the Low Pass 2/High Pass 3 threshold line to the desired frequency in the Frequency Curve by clicking and dragging;
   b) adjust the Low Pass 2 or High Pass 3 virtual knobs;
   c) Enter the desired frequency directly into the Freq. text box.

5. Select a filter curve from the Type dropdown menu below either the Low Pass 2 or High Pass 3 virtual knobs.

6. Select the desired curve steepness from the Slope dropdown menu.

5.3.4 Parametric EQ

The Parametric EQ tab displays and controls PEQ DSP module settings in two formats (similar to the Filter/Crossover tab):

• Control View —allows parameter tweaks via virtual controls, as well as pull-down menus for EQ type (parametric, low shelving, and high shelving).
• Frequency Curve —displays the filter curves in visual form, and allows click-and-drag manipulation of EQ frequencies and gain.

The Frequency Curve and Control View interact with each other and simultaneously shift as you change parameters in either view.

Parametric EQ Control View

The Control View of the Parametric EQ tab contains virtual knob controls for Gain, Frequency, Q (parametric EQ only). Exact parameter values appear in boxes below
each virtual knob. These parameters may be altered by either adjusting the virtual knobs or by entering values directly in the parameter boxes.
To activate an EQ band, click the button (Filter 1, Filter 2, and so on) at the top of each channel strip. The channel button will light up to indicate the EQ is active.
Pull-down Type menus for each EQ band contain these additional options:

• PEQ (parametric EQ)
• LS6 (low shelving EQ, with a 6 dB/Octave slope)
• LS12 (low shelving EQ, with a 12 dB/Octave slope)
• HS6 (high shelving EQ, with a 6 dB/Octave slope)
• HS12 (high shelving EQ, with a 12 dB/Octave slope)

Parametric EQ Frequency Curve Display

The Frequency Curve displays a frequency range from 20 Hz to 20 kHz, with 15 dB of cut/boost displayed on the vertical axis. Within this graphic field, the EQ curve appears as a solid fill above and below the 0 dB center line and running from left to right. The curve shifts and moves to reflect changing parameter values. Dotted vertical lines indicate frequency points for the various EQ bands, numbered 1 through 8, and these frequency points can be selected and moved through the frequency spectrum using the mouse or trackpad. The gain for each EQ band may also be adjusted by using the frequency lines.

Adjusting Parametric EQ frequency via click-and-drag

1. Click and hold on the numbered box at the top of the desired EQ band frequency line.
2. Drag the frequency line to the desired location on the frequency spectrum.
3. The EQ curve shown by the solid blue fill will move and adjust as you shift the frequency line. The virtual knob and frequency displayed in the Control View will also simultaneously change as you move the frequency line in the Frequency Curve.

Adjusting Parametric EQ gain via click-and-drag

1. Click and hold over the numbered box at the top of the desired EQ band’s frequency line.
2. Move the cursor vertically up or down the frequency line to the desired gain level.
3. The EQ curve shown by the solid blue fill will re-size and adjust as you move the cursor up and down the frequency line. The virtual gain knob and gain dB displayed in the Control View will also simultaneously change as you move the cursor up and down frequency line in the Frequency Curve.

5.3.5 Dynamic EQ

The Dynamic EQ tab displays and controls DEQ DSP module settings in two formats (similar to the Filter/Crossover and Parametric EQ tabs):

• Frequency Curve —displays the layered dynamic EQ curves in visual form, and allows click-and-drag manipulation of dynamic EQ/filter frequencies and gain.
• Control View —allows parameter tweaks via virtual controls, as well as pull-down menus for EQ/filter type (Type) and gain reduction/boost ratio (Ratio).

The Frequency Curve and Control View interact with each other and simultaneously shift as you change parameters in either view.

Dynamic EQ Frequency Curve Display

The Frequency Curve displays a frequency range from 20 Hz to 20 kHz, with layered dynamic EQ curves. Within this graphic field, the dynamic EQ curves appear as solid
blue lines that appear at every 10 dB (0 to -50 dB) threshold on the vertical axis. The curves shift and move to reflect changing parameter values. Dotted vertical lines indicate frequency points for the various dynamic EQ bands, numbered 1 and 2 (per channel), and these frequency points can be selected and moved through the frequency spectrum using the cursor. The gain for each dynamic EQ band may also be adjusted by using the frequency lines.

Adjusting dynamic EQ frequency via click-and-drag

1. Click and hold on the numbered box at the top of the desired dynamic EQ band frequency line.
2. Drag the frequency line to the desired location on the frequency spectrum.
3. The layered dynamic EQ curves shown by the layered blue lines will move and adjust as you shift the frequency line. The virtual knob and frequency displayed in the Control View will also simultaneously change as you move the frequency line in the Frequency Curve.

Adjusting dynamic EQ gain via click-and-drag

1. Click and hold on the numbered box at the top of the desired dynamic EQ band frequency line.
2. Move the cursor vertically up or down the frequency line to the desired gain level.
3. The layered EQ curves shown by the solid blue line will adjust as you move the cursor up and down the frequency line. The virtual gain knob and gain dB displayed in the Control View will also simultaneously change as you move the cursor up and down frequency line in the Frequency Curve.

Dynamic EQ Control View

The Control View of the Dynamic EQ tab contains virtual knob controls for Gain, Threshold, Frequency, Q (bandpass filter only). Exact parameter values appear in boxes below each virtual knob. These parameters may be altered by either adjusting the virtual knobs or by entering values directly in the parameter boxes.

Pull-down Type menus for each dynamic EQ band contain these additional options:

• BP (bandpass filter)
• LP6 (lo-pass filter, with a 6 dB/Octave slope)
• LP12 (lo-pass filter, with a 12 dB/Octave slope)
• HP6 (hi-pass filter, with a 6 dB/Octave slope)
• HP12 (hi-pass filter, with a 12 dB/Octave slope)

The Ratio pulldown menu offers four options:

• 1:2.0
• 1:3.0
• 1:5.0
• 1:10

Gain vs. Ratio
Positive gain settings result in a frequency boost at low signal levels and a nearly flat EQ response at high levels. Negative gain settings yield opposite results: at low signal levels, the EQ response is nearly flat, while higher signal levels receive increasing amounts of cut from the equalizer. The higher the Ratio setting, the more the equalizer will cut or boost the signal at different signal levels.

Programming a dynamic EQ

1. Choose an EQ type from the Type pulldown menu.
2. Set the dynamic EQ’s band frequency by rotating the Frequency virtual knob. The programmed frequency can represent either the center frequency for band-pass (BP) mode, or the threshold frequency for low- (LP) and high-pass modes (HP).
3. For band-pass BP mode, control the width of the band-pass curve by rotating the Quality virtual knob parameter. High Quall values produce a narrow, steep curve, while low Quall values create a wide curve with a gentle slope.
4. Set the dynamic EQ’s band cut or boost by rotating the Gain virtual knob.
5. Set the signal threshold by rotating the Threshold knob.
6. Program your desired ratio by selecting from the Ratio pulldown menu. Similar to a compressor, higher ratio values yield a more intense equalization effect.
7. Adjust the attack (Attack) and release (Release) values by rotating each parameters respective virtual knob.

6. Applications

Refer to the application documentation available for download at labgruppen.com.

6.1 Bi-amping

Bi-amping splits a mono signal into upper and lower frequency bands, and then assigns each frequency band to separate speaker cabinets or separate drivers within a cabinet. A subwoofer typically takes the low frequency range. By splitting the signal this way, the speakers work more efficiently, and you can achieve a cleaner overall sound.

Setting up hardware for bi-amping

1. Run a 4-pole speaker cable with professional twist-locking connectors from OUTPUT CH A to the subwoofer (the subwoofer receives its low-frequency signal from Channel B using poles 2+ and 2-, while the middle and upper frequency ranges use Channel A via poles 1+ and 1-).
2. Set the subwoofer into BIAMPING mode.
3. Run a 2-pole speaker cable with professional twist-locking connectors from the subwoofer to the other speaker.

Programming DSP parameters for bi-amping using the front panel

1. Choose the BIAMP2 setting on the Amp Mode screen.
2. Go to the XOVER screen using the UP/DOWN buttons to set appropriate high/low crossover frequencies.
3. In Channel A#1, choose your high-pass filter type (HP type: BUT6, BUT12, BES12, etc.) and set the cutoff frequency (HP freq) to approximately 100 Hz. Deactivate the low-pass filter (LP type: OFF) on this channel and set the gain level (Gain) to suit your system.
4. In Channel B#1, choose your low-pass filter type (LP type : BUT6, BUT12, BES12, etc.) and set the cutoff frequency (LP freq) to approximately 100 Hz. Deactivate the high-pass filter (HP type: OFF) on this channel and set the gain level (Gain) to suit your system.

Programming PDX Controller Software for bi-amping

1. Select the Configuration tab.

2. Choose the BIAMP2 signal path in the Configuration tab. A confirmation window will pop up.

3. Click “Yes” on the Amp Mode confirmation window.

4. Select the Filter/Crossover tab.

5. Select the X-Over button below the Frequency Curve display. A confirmation window will up up asking if you wish to set a Default Crossover.

6. Click “Yes” in the confirmation window. The X-Over button will illuminate, and default crossover settings will appear in the Frequency Curve and Control View.

7. Choose a filter type from either the Low Pass 2 or High Pass 3 Type pulldown menus (the software defaults to a Butterworth filter). Any changes to the Low Pass 2 or High Pass 3 settings will also automatically appear in both filter’s Control View settings.

8. Choose a filter slope setting from the Slope pulldown menu under either Low Pass 2 or High Pass 3 (the software defaults to a Butterworth filter). Again, matching parameters will automatically appear in both filter’s Control View settings.

9. Set the crossover frequency by using any of these three methods:
   a) Rotate the Low Pass 2 or High Pass 3 virtual Freq knobs in the Control View. The crossover frequency displayed in the Freq box below the virtual knob will change simultaneously for both filters.
   b) Select the text box below either Freq virtual knob, and type your desired frequency directly into the text box.
   c) Go to the Frequency Curve display, click on the frequency line marked “2,” and drag the frequency line to the desired area of the Frequency Curve. Parameter settings and virtual knobs in the Control View will automatically move and change as you drag the crossover frequency through the Frequency Curve window.

10. If necessary, adjust the Gain settings for Channel A and Channel B by rotating the respective Gain virtual knobs.

6.2 Hookup Diagrams

One side sub and linked passive top, Turbo sound NuQ102 and NuQ118B together with Lab.gruppen PDX3000

Two passive full range tops in stereo, Turbo sound NuQ102 together with Lab.gruppen PDX3000

Full range monitor in bi-amp mode, Turbo sound TFM122M together with Lab.gruppen PDX3000

Two passive full range monitors, two Turbo sound TFM122M together with Lab.gruppen PDX3000

Two tops in bi-amp mode, two subs in passive mode, two Turbo sound NuQ152 and NuQ118B together with three Lab.gruppen PDX3000

7. Installation

7.1 Rack mounting

Your PDX amplifier fits into a 19” rack and requires two rack units. Install into the rack using four attaching screws and washers for the front panel. Consider reinforcing the back panel using rack accessories (supplied with rack), especially if you will be taking the PDX on the road. Make sure enough cool air reaches the rack, especially when other rack equipment emanates a lot of heat. The PDX amplifiers circulate heat from the front to the rear vents to relieve heat inside the rack enclosure.

If you are installing multiple power amplifiers into a 19″ rack, add filled panels in the empty rack spaces to avoid circulation of hot air.

Fan speed adjusts automatically to assure safe operation. Never block ventilation openings. Should internal temperature reach extreme values, the unit will shut down automatically, and resume operation when cooled down.

7.2 Connections

Audio inputs

Each channel input uses either XLR or ¼ ” jacks. The XLR jacks can accept balanced XLR connections, while the ¼” jacks can accept both balanced ¼” TRS connectors and unbalanced ¼” TS connectors. To deploy XLR connectors for unbalanced signals, bridge pins 1 and 3; mono ¼” TS connectors do not require any alteration to carry unbalanced signals.

When working with balanced signals, please make sure to exclusively use balanced cables. One unbalanced cable in the signal chain can change a balanced signal into an unbalanced signal.

Outputs
Your PDX amplifier requires speak ON twist-locking professional speaker connectors. These professional speaker connectors were developed specially for driving
high-powered speakers. The connectors snap in securely, prevent electric shock, and ensure correct polarity.
The CHANNEL A output contains output pins for both CHANNEL A (1+/1-) and CHANNEL B (2+/2-), so that both channels, if desired, can be sent out simultaneously on a single 4-pole speaker cable.

The CHANNEL B output, on the other hand, has pin outs for CHANNEL B only (1+/1-).

◊ Whenever possible, use thick and short speaker cables to minimize power loss.

7.3 Connecting to mains

Always connect your PDX amplifier to the voltage specified on the rear of the device. Connecting the amp to an incorrect voltage can permanently damage your amp. Before powering up the amplifier, double-check all connections and fully lower the gain setting.

8. Specifications

Other important information

1. Register online. Please register your new Music Tribe equipment right after you purchase it by visiting labgruppen.com. Registering your purchase using our simple online form helps us to process your repair claims more quickly and efficiently. Also, read the terms and conditions of our warranty, if applicable.
2. Malfunction. Should your Music Tribe Authorized Reseller not be located in your vicinity, you may contact the Music Tribe Authorized Fulfiller for your country listed under “Support” at labgruppen.com. Should your country not be listed, please check if your problem can be dealt with by our “Online Support” which may also be found under “Support” at labgruppen.com. Alternatively, please submit an online warranty claim at labgruppen.com BEFORE returning the product.
3. Power Connections. Before plugging the unit into a power socket, please make sure you are using the correct mains voltage for your particular model. Faulty fuses must be  replaced with fuses of the same type and rating without exception.

FEDERAL COMMUNICATIONS COMMISSION COMPLIANCE INFORMATION

Lab Gruppe PDX3000

Responsible Party Name:  Music Tribe Commercial NV Inc.
Address:   5270 Procyon Street Las Vegas, NV 89118 USA
Phone Number: +1 702 800 8290

PDX3000

complies with the FCC rules as mentioned in the following paragraph: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
• Consult the dealer or an experienced radio/TV technician for help This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.

Important information:
Changes or modifications to the equipment not expressly approved by Music Tribe can void the user’s authority to use the equipment.

LAB.GRUPPEN

References

• Lab Gruppen | Home
• Music Tribe

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