thomann D4-500 Digital Power Amplifier User Manual

thomann D4-500 Digital Power Amplifier User Manual

General information

This manual contains important instructions for the safe operation of the unit. Read and follow the safety instructions and all other instructions. Keep the manual for future reference. Make sure that it is available to all those using the device. If you sell the unit please make sure that the buyer also receives this manual.

Our products are subject to a process of continuous development. Thus, they are subject to change.

Further information

On our website (www.thomann.de) you will find lots of further information and details on the following points:

topics of interest for you quickly.
Online guides| Our online guides provide detailed information on technical basics and terms.
Personal consultation| For personal consultation please contact our technical hotline.
Service| If you have any problems with the device the customer service will gladly assist you.

Notational conventions

This manual uses the following notational conventions:

Letterings

The letterings for connectors and controls are marked by square brackets and italics. Examples: [VOLUME] control, [Mono] button

Cross-references

References to other locations in this manual are identified by an arrow and the specified page number. In the electronic version of the manual, you can click the cross-reference to jump to the specified location.

Example: See Ä ‘Cross-references’ on page 6.

Symbols and signal words

In this section you will find an overview of the meaning of symbols and signal words that are used in this manual.

immediate dangerous situation that will result in death or serious injury if it is not avoided.
CAUTION!| This combination of symbol and signal word indicates a pos‐ sible dangerous situation that can result in minor injury if it is not avoided.
NOTICE!| This combination of symbol and signal word indicates a pos‐ sible dangerous situation that can result in material and environmental damage if it is not avoided.
Warning signs| Type of danger
---|---
| Warning – high-voltage.
| Warning – danger zone.

Safety instructions

Intended use

This device amplifies electric audio frequency signals to operate passive speakers. Use the device only as described in this user manual. Any other use or use under other operating con‐ ditions is considered to be improper and may result in personal injury or property damage. No liability will be assumed for damages resulting from improper use.

This device may be used only by persons with sufficient physical, sensorial, and intellectual abilities and having corresponding knowledge and experience. Other persons may use this device only if they are supervised or instructed by a person who is responsible for their safety.

Safety

DANGER!
Danger for children
Ensure that plastic bags, packaging, etc. are disposed of properly and are not within reach of babies and young children. Choking hazard!

Ensure that children do not detach any small parts (e.g. knobs or the like) from the unit. They could swallow the pieces and choke!

Never let children unattended use electrical devices

DANGER!
Electric shock caused by high voltages inside
Within the device there are areas where high voltages may be present. Never remove any covers.

There are no user-serviceable parts inside.

Do not use the device if covers, protectors or optical components are missing or damaged.

DANGER!
Electric shock caused by short-circuit
Always use proper ready-made insulated mains cabling (power cord) with a pro‐ tective contact plug. Do not modify the mains cable or the plug. Failure to do so could result in electric shock/death or fire. If in doubt, seek advice from a regis‐ tered electrician.

CAUTION!
Possible hearing damage
The device can produce volume levels that may cause temporary or permanent hearing impairment. Over an extended period of time, even levels that seem to be uncritical can cause hearing damage.

Decrease the volume level immediately if you experience ringing in your ears or hearing impairment. If this is not possible, keep a greater distance or use suffi‐ cient ear protectors.

NOTICE!
Risk of fire
Do not cover the device nor any ventilation slots. Do not place the device near any direct heat source. Keep the device away from naked flames.

NOTICE!
Operating conditions
This device has been designed for indoor use only. To prevent damage, never expose the device to any liquid or moisture. Avoid direct sunlight, heavy dirt, and strong vibrations.

NOTICE!
Power supply
Before connecting the device, ensure that the input voltage (AC outlet) matches the voltage rating of the device and that the AC outlet is protected by a residual current circuit breaker. Failure to do so could result in damage to the device and possibly injure the user.

Unplug the device before electrical storms occur and when it is unused for long periods of time to reduce the risk of electric shock or fire.

NOTICE!
Magnetic fields
The device generates strong magnetic fields that can interfere with the function of poorly shielded devices. The strongest magnetic fields are directly above and below the power amplifier. Therefore, never place sensitive devices such as preamplifiers, radio transmission systems, or tape decks directly above or below the power amplifier. When installing the power amplifier into a rack, you should place it in the lowest position, and further equipment such as pre-amplifiers in the highest position.

NOTICE!
Possible staining
The plasticiser contained in the rubber feet of this product may possibly react with the coating of your parquet, linoleum, laminate or PVC floor and after some time cause permanent dark stains.

In case of doubt, do not put the rubber feet directly on the floor, but use felt-pad floor protectors or a carpet.

Features

• Output power
  • 4 × 500 W @ 4 W
  • 4 × 250 W @ 8 W
• 4 inputs, 4 outputs
• Frequency response 20 Hz to 20 kHz
• 19″ rack able (1 RU, installation depth 240 mm)

Installation and operation

NOTICE!
Possible staining
The Plasticine contained in the rubber feet of this product may possibly react with the coating of your parquet, linoleum, laminate or PVC floor and after some time cause permanent dark stains.
In case of doubt, do not put the rubber feet directly on the floor, but use felt-pad floor protectors or a carpet.

Unpack and carefully check that there is no transportation damage before using the unit. Keep the equipment packaging. To fully protect the device against vibration, dust and moisture during transportation or storage use the original packaging or your own packaging material suitable for transport or storage, respectively.

Create all connections while the device is off. Use the shortest possible high-quality cables for all connections. Take care when running the cables to prevent tripping hazards.

Connections and controls

Front panel

1. [ON | OFF]
   Main switch to turn the device on and off.

2. LED [Power]
   This LED indicates, that the unit is operational and lights up constantly as soon as the device is switched on.

3. LED [–10 dB] and [–20 dB]
   These LEDs indicate the intensity of the input signal (–10 dB or –20 dB). If none of the LEDs lights up, increase the signal level with the controls CH-A to CH-D and -if required- check the wiring.
   If these LEDs are lit without an input signal is present, there is an error. In this case, disconnect the speakers from the power amplifier and turn the controls for the input gain of channels CH-A to CH-D down to minimum. If the LEDs still light up, the device must be inspected by an authorized service centre.

4. LED [Clip]
   Overload indicator for channels CH-A to CH-D. These LEDs light up when the distortion of the output signal increases 1 %.

5. LED [Fault]
   Error indication for channels CH-A to CH-D. These LEDs light up when one of the protective circuits triggers (see

6. Chapter 7 ‘Technical specifications’ on page 21).
   When turning the device on, the LEDs light up for three seconds. During this time, there is no signal present at the output yet. Once the LEDs turn off, the device is operational.

7. LED [Thermal]
   Over temperature indicator for the channels CH-A to CH-D. These LEDs light up when the respective heat sink exceeds a certain temperature.
   When turning the device on, the LEDs light up for three seconds. During this time, there is no signal present at the output yet. Once the LEDs turn off, the device is operational.

8. [CH-A …-D]
   Controls for input gain of channels CH-A to CH-D.
   Rear panel
   

9. [INPUT CH-A …-D]
   Lockable combo XLR/¼-inch connectors for signal inputs.

10. [OUTPUT CH-A …-D]
    Lockable NL4 mounting connectors for signal outputs.

11. [Stereo | Bridge] selector switch
    Switch for operating modes ‘Stereo’ (channels operate independently of each other) and ‘Bridge’ (two channels are interconnected to form one channel with double output).
    [Lift | Ground] selector switch
    The Ground/Lift switch allows you to interrupt the connection between the device’s protective earth terminal and signal ground in order to prevent hum loops (Lift/unpressed state: disconnected. Ground position / switch pressed: Earth pin and signal ground are electrically connected).

Current consumption

The following table contains information on the typical current consumption depending on the output power level (root mean square value ARMS). All values based on a 230 V mains voltage and a 1 kHz input signal at 0 dB (sine).

Technical specifications

Undervoltage, overcurrent, lim‐ iter
Operating voltage supply| AC 230 V            , 50/60 Hz
Power consumption| see  Chapter 6 ‘Current consumption’ on page 20
Dimensions| 1 RU in a 19″ rack, installation depth 240 mm
Weight| 4.6 kg

Plug and connection assignment

Introduction

This chapter will help you select the right cables and plugs to connect your valuable equip‐ ment in such a way that a perfect sound experience is ensured.
Please note these advice, because especially in ‘Sound & Light’ caution is indicated: Even if a plug fits into the socket, an incorrect connection may result in a destroyed power amp, a short circuit or ‘just’ in poor transmission quality!

Balanced and unbalanced trans‐ mission

Unbalanced transmission is mainly used in semi-professional environment and in hifi use.
Instrument cables with two conductors (one core plus shielding) are typical representatives of the unbalanced transmission. One conductor is ground and shielding while the signal is trans‐ mitted through the core.

Unbalanced transmission is susceptible to electromagnetic interference, especially at low levels, such as microphone signals and when using long cables.

In a professional environment, therefore, the balanced transmission is preferred, because this enables an undisturbed transmission of signals over long distances. In addition to the conduc‐ tors ‘Ground’ and ‘Signal’, in a balanced transmission a second core is added. This also transfers the signal, but phase-shifted by 180°.

Since the interference affects both cores equally, by subtracting the phase- shifted signals, the interfering signal is completely neutralized. The result is a pure signal without any noise inter‐ ference.

1/4″ TS phone plug (mono, unbalanced)

1. Signal
2. Ground, shielding

1/4″ TRS phone plug (mono, bal‐ anced)

1. Signal (in phase, +)
2. Signal (out of phase, –)
3. Ground

1/4″ TRS phone plug (stereo, unbalanced)

1. Signal (left)
2. Signal (right)
3. Ground

XLR plug (balanced)

1. Ground, shielding
2. Signal (in phase, +)
3. Signal (out of phase, –)
   

NL4 mounting connectors

1, + Signal 1 (in phase)
1, – Signal 1 (180 degree phase shift)
2, + Signal 2 (in phase)
2, – Signal 2 (180 degree phase shift)

Cleaning

Fan grids

The fan grids of the device must be cleaned on a regular basis to remove dust and dirt. Before cleaning, switch off the device and disconnect AC-powered devices from the mains. Use a lintfree damp cloth for cleaning. Never use solvents or alcohol for cleaning.

Protecting the environment

Disposal of the packaging mate‐ rial

For the transport and protective packaging, environmentally friendly materials have been chosen that can be supplied to normal recycling.

Ensure that plastic bags, packaging, etc. are properly disposed of.

Do not just dispose of these materials with your normal household waste, but make sure that they are collected for recycling. Please follow the notes and markings on the packaging.

Disposal of your old device

This product is subject to the European Waste Electrical and Electronic Equipment Directive (WEEE). Do not dispose with your normal household waste.

Dispose of this device through an approved waste disposal firm or through your local waste facility. When discarding the device, comply with the rules and regulations that apply in your country. If in doubt, consult your local waste disposal facility.

Musikhaus Thomann · Hans-Thomann-Straße 1 · 96138 Burgebrach · Germany · www.thomann.de

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