OMNITRONIC EM-650B MK2 Entertainment Mixer User Manual

OMNITRONIC EM-650B MK2 Entertainment Mixer

Product Information

The product is an audio mixer with various features and controls. It is designed for professional use and can be connected to different audio devices. The mixer has multiple input and output options, including XLR, 6.3mm jacks, and stereo cinch connectors. It also has a built-in talkover function and recording output.

Product Features

• 7 level controls
• 8 time controls
• Power switch
• Input selector switch
• Signal indicator
• Channel fader
• Cue buttons
• LED level indicators
• Output volume control
• Tone controls (low, mid, high)
• Assignment buttons
• Recording output
• Talkover function controls
• Headphone output
• Power switch
• Power connector

Technical Specifications

• Distortion: Less than specified gain level
• Power: 230 V AC, 50 Hz, 9 W
• Input Connectors: Combination XLR/6.3mm jack (symmetrical), stereo cinch
• Output Connectors: Stereo cinch, stereo XLR, 6.3mm stereo jack (8 ohms)
• Input Sensitivity: 0.75 V/1.5 V RMS (switchable)

Product Usage Instructions

Safety Instructions
Ensure that the product is connected to a power source with the correct voltage and frequency as indicated on the product label. Use a fault current protection switch (FI) for added safety. If the power plug has a grounding pin, connect it to a socket with a protective ground. Never disable the protective ground of a power cable.

Environmental Protection:
Dispose of the product in accordance with local environmental regulations to minimize environmental impact.

Front Panel Controls:
The front panel of the mixer contains various controls and indicators:

• Level controls (DB)
• Time controls
• Power switch (ON)
• Input selector switch
• Signal indicator
• Channel fader
• Cue buttons
• LED level indicators
• Output volume control (VOL)
• Tone controls (LOW, MID, HI)
• Assignment buttons
• Recording output (REC)
• Talkover function controls
• Cue/PGM control
• Headphone output (PHONES)

Rear Panel Connections:
The rear panel of the mixer has various input and output connectors:

• Power switch (ON/OFF)
• Power connector
• Recording output (REC)
• Input jacks (PHONO/AUX 1/2)
• Ground connection (GND)

Setup and Connection:
Before using the mixer, perform the following steps:

1. Ensure the power switch is in the OFF position.
2. Connect the included power cable to the power connector on the rear panel.
3. Connect audio devices to the appropriate input jacks on the rear panel (PHONO/AUX 1/2).
4. If necessary, connect a ground wire to the ground connection (GND).

Power On:
To turn on the mixer, set the power switch (ON/OFF) to the ON position.

Operation:
Use the various controls and indicators on the front panel to adjust and mix audio signals. Refer to the user manual for detailed instructions on using each control.

Cleaning and Maintenance:
Clean the mixer regularly with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials that may damage the surface. Refer to the user manual for specific cleaning instructions. Regular maintenance is not required, but ensure proper storage and protection of the mixer when not in use.

Introduction

• Welcome to Omnitronic! Thank you for choosing one of our products.
• This user manual will show you how to install and operate the mixer. Users of this product are recommended to carefully read all warnings in this manual and on the unit in order to protect yourself and others from damage.
• Please save this document for future needs and pass it on to further owners.
• This user manual is valid for item number: 10007113. Please save this document for future needs and pass it on to further owners.

Product features

• 5 input channels with recessed gain controls on the rear panel, signal LED and super smooth dual-rail channel faders
• 2 separate microphone channels with level control, 3-way equalizer and talkover button
• Talkover level and response time adjustable
•  Prefader listening (CUE) to the stereo input channels via adjustable headphone output
• 2 adjustable master outputs with 3-way equalizer and 10-digit stereo LED level meter
• 2 record outputs (independent of the master channels) with on/off switch for microphone signals
• 9 line inputs and 2 line/phono inputs via RCA jacks
• 2 microphone inputs via combo jacks (XLR/ 6.3 mm)
• 3 master outputs (optionally XLR/RCA) and 2 record outputs via RCA jacks
• 19″ dimensions for rack installation, 2 U

Safety Instructions

Caution!
Keep this device away from rain and moisture!
Caution!
Be careful with your operations. With a dangerous voltage you can suffer a dangerous electric shock when touching the wires!

This device has left our premises in absolutely perfect condition. In order to maintain this condition and to ensure a safe operation, it is absolutely necessary for the user to follow the safety instructions and warning notes written in this user manual. Damages caused by the disregard of this user manual are not subject to warranty. The dealer will not accept liability for any resulting defects or problems.

• Unpacking

  • Please make sure that there are no obvious transport damages. Should you notice any damages, do not take the device into operation and immediately consult your local dealer.
  • Save the package and all packing materials. In the event that a fixture must be returned to the factory, it is important that the fixture be returned in the original factory box and packing.

• Protection Class
  This device falls under protection-class II and features a protective insulation. The voltage and frequency must exactly be the same as stated on the device. Wrong voltages or power outlets can lead to the destruction of the device and to mortal electrical shock.

• Power Cord

  • Always plug in the power plug least. The power plug must always be inserted without force. Make sure that the plug is tightly connected with the outlet.
  • Never let the power cord come into contact with other cables! Handle the power cord and all connections with the mains with particular caution! Never touch them with wet hands, as this could lead to mortal electrical shock.
  •  Never modify, bend, strain mechanically, put pressure on, pull or heat up the power cord. Never operate next to sources of heat or cold. Disregard can lead to power cord damages, fire or mortal electrical shock.
  • The cable insert or the female part in the device must never be strained. There must always be sufficient cable to the device. Otherwise, the cable may be damaged which may lead to mortal damage.
  • Make sure that the power cord is never crimped or damaged by sharp edges. Check the device and the power cord from time to time.
  • If extension cords are used, make sure that the core diameter is sufficient for the required power consumption of the device. All warnings concerning the power cords are also valid for possible extension cords.
  • Always disconnect from the mains, when the device is not in use or before cleaning it. Only handle the power cord by the plug. Never pull out the plug by tugging the power cord. Otherwise, the cable or plug can be damaged leading to mortal electrical shock. If the power plug or the power switch is not accessible, the device must be disconnected via the mains.
  • If the power plug or the device is dusty, the device must be taken out of operation, disconnected and then be cleaned with a dry cloth. Dust can reduce the insulation which may lead to mortal electrical shock. More severe dirt in and at the device should only be removed by a specialist.

• Liquids
  There must never enter any liquid into power outlets, extension cords or any holes in the housing of the device. If you suppose that also a minimal amount of liquid may have entered the device, it must immediately be disconnected. This is also valid, if the device was exposed to high humidity. Also if the device is still running, the device must be checked by a specialist if the liquid has reduced any insulation. Reduced insulation can cause mortal electrical shock.

• Foreign Objects
  There must never be any objects entering into the device. This is especially valid for metal parts. If any metal parts like staples or coarse metal chips enter into the device, the device must be taken out of operation and disconnected immediately. Malfunction or shortcircuits caused by metal parts may cause mortal injuries.

Operating

• Determinations
  This device is used to mix audio sources. It has been specially designed for professional applications.

• Power Supply
  Only connect the device to a properly installed mains outlet. The outlet must be protected by residual current breaker (RCD). The voltage and frequency must exactly be the same as stated on the device. If the mains cable is equipped with an earthing contact, then it must be connected to an outlet with a protective ground. Never deactivate the protective ground of a mains cable. Failure to do so could possibly injure the user.

• Installation

  • Do not shake the device. Avoid brute force when installing or operating the device. When choosing the installation spot, please make sure that the device is not exposed to extreme heat, moisture or dust. There should not be any cables lying around. You endanger your own and the safety of others! Taking into Operation
  • Operate the device only after having familiarized with its functions. Do not permit operation by persons not qualified for operating the device. Most damages are the result of unprofessional operation!

• Ambient Conditions

  • The ambient temperature must always be between -5° C and +45° C. Keep away from direct insulation (particularly in cars) and heaters. The relative humidity must not exceed 50 % with an ambient temperature of 45° C.
  • This device must only be operated in an altitude between -20 and 2000 m over NN.
  • Never use the device during thunderstorms. Over voltage could destroy the device. Always disconnect the device during thunderstorms.
  • This device must never be operated or stockpiled in surroundings where splash water, rain, moisture or fog may harm the device. Moisture or very high humidity can reduce the insulation and lead to mortal electrical shocks.
  • When using smoke machines, make sure that the device is never exposed to the direct smoke jet and is installed in a distance of 0.5 meters between smoke machine and device.

• Transport
  Please use the original packaging if the device is to be transported.

• Cleaning and Service

  • Disconnect from mains before cleaning! Never use solvents or aggressive detergents in order to clean the device! Rather use a soft and damp cloth.
  • There are no serviceable parts inside the device. Maintenance and service operations are only to be carried out by authorized dealers! Should you need any spare parts, please use genuine parts.

• Modifications and Guarantee

  • Please consider that unauthorized modifications on the speaker system are forbidden due to safety reasons!
  • If this device will be operated in any way different to the one described in this manual, the product may suffer damages and the guarantee becomes void. Furthermore, any other operation may lead to dangers like short-circuit, burns, electric shock, etc.

Potecting the environment
When to be definitively put out of operation, take the product to a local recycling plant for a disposal which is not harmful to the environment. Devices marked with this symbol must not be disposed of as household waste. Contact your retailer or local authorities for more information. Remove any inserted batteries and dispose of them separately from the product.

Operating Elements and Connections

Front panel

1. MIC 1/2 inputs Balanced inputs for connecting microphones via XLR or 6.3 mm jack plug.
2. Assignment switches 1-3 Use these switches (with LED), to assign the microphone channels MIC 1/2 individually to three master channels.
3. VOL controls Level controls for the microphone channels MIC 1/2. If the PEAK LED lights permanently, the corresponding channel is overloaded.
4. LED level indicators 10-digit LED level indicators for the microphone channels MIC 1/2 within the range of -20 dB to +9 dB.
5. LOW, MID, HI controls 3-way equalizer for the microphone channels MIC 1/2: HI, MID, LOW.
6. ON AIR selectors On/off switches with LED for the microphone channels MIC 1/2. The LEDs will verify which microphone is switched on.
7. DB level control Adjusts the attenuation level of the talkover function.
8. TIME control Adjusts the response time of the talkover function.
9. ON selector On/off switch with LED for the talkover function. With the button is pressed (LED lights), the levels of the channels 1-5 are attenuated when announcements are made with the microphone.
10. Input selectors For selecting the input source for channels 1-5. The LEDs will verify which input is active.
11. Signal indicators Light when a signal is present in channels 1-5.
12. Channel faders Level controls for channel 1-5.
13. CUE buttons Buttons for prefader listening of the input channels 1-5 ahead of the respective channel fader via headphones. With the button pressed, the adjacent LED lights to immediately indicate that the channel is monitored.
14. LED level indicators 10-digit LED level indicators for stereo master signal within the range of -20 dB to +9 dB.
15. Output level controls Adjust the level for master channel 1-3.
16. LOW, MID, HI controls 3-way equalizer for the master channels 1-3: HI, MID, LOW.
17. Assignment switches 1-3 Use these switches (with LED), to assign the master channels 1-3 individually to both recording outputs.
18. Recording output REC Stereo output (RCA) for connecting a recording unit. The recording level is independent of the position of the output level controls.
19. CUE/PGM control For selecting and crossfading the monitoring signal for the headphones output:
    • Left position CUE: the prefader level of the input channel of which the button CUE is pressed is monitored.
    • Right position PGM: the music program currently playing is monitored ahead of the output controls.
    • In mid-position, a mixed signal consisting of prefader level and of the current music program can be heard.
20. VOL control Volume control for the headphones output.
21. Headphones jack 6.3 mm jack for connecting stereo headphones.
    **Rear panel

**

22. Power switch Turns the unit on and off.
23. Power input Plug in the supplied power cable here.
24. Recording output REC Stereo output (RCA) for connecting a recording unit. The recording level is independent of the position of the output level controls.
25. MASTER 1-3 outputs Stereo outputs (optionally 3-pin XLR or RCA) for master channels 1 – 3 for connecting an amplifier or other units with line level inputs (e.g. a further mixer, active speakers). Use the adjacent selector to switch the level between 0.75 V and 1.5 V.
26. LINE 1-8 inputs Stereo inputs LINE (RCA) for channel 1-5 for connecting units with line level outputs (e. g. CD player).
27. Gain controls Trimming controls for adjusting the input amplification of channel 1-5.
28. PHONO/AUX 1/2 inputs Stereo inputs (RCA) for channel 1/2 for connecting turntables with magnetic system. With the corresponding selector the inputs can be switched to line level (AUX).
29. GND Ground clamping screws for turntables.

Setup

Installation
Install the unit on a plane surface or in your rack. For 19″ (483 mm) rack installation, 2 units are required. When mounting the unit into the rack, please make sure that there is enough space around the device so that the heated air can be passed on. Steady overheating will damage your device. You can fix the unit with four screws M6 in the rack.

Cable connections
The mixer offers numerous, highly flexible possibilities for balanced or unbalanced connection of professional audio equipment. To avoid interfering noise, switch off the mixer or set the output controls to minimum prior to connecting and disconnecting equipment. Be sure to use only short, high-grade cables. The illustrations below show the wiring of these cables.
Note
If the mixer is connected to both a computer and to a unit grounded via the mains cable (e.g. amplifier), noise interference may occur due to ground loops. To eliminate this interference, a ground isolator (e. g. OMNITRONIC LH-082) may be used to connect the mixer to the unit.

Powering up
To protect your audio equipment, specifically your speakers, follow this power-up sequence: Set all output volume controls of any equipment to minimum. Switch on your audio sources first, then the mixer. Always switch on amplifiers last. Then turn up the volume control on your sources (if provided) and set the output volume of the mixer to a low level. Turn up the volume controls of your amplifier(s) slowly. Make adjustments to all volume settings as needed. For switching off, follow the inverse sequence: always switch off amplifiers first, then the mixer and then the audio sources.

Operation

• Basic adjustment of the input channels

1. Set all rear gain controls TRIM to mid-position with an appropriate tool e.g. a screw driver.
2. Set all tone controls to mid-position.
3. Use the input selector to select the input to which the audio source is connected.
4. Feed an audio signal (test signal or music piece) to the channel. Switch off the units which are to play on the other channels or set them to pause.
5. Advance the channel fader to approx. 2/3 of its maximum.
6. Use one of the assignment switches (LED lights) to switch the input channel to the master channel which is to be used for level control.
7. Advance the volume control of the master channel used to approx. 2/3 of its maximum.
8. Via the LED level indication of the master channel used, control the level of the input channel with its gain control. An optimum level control is obtained if level values in the 0 dB range are shown at average volume. If the red LEDs of the level indication light up, there is an overload of the channel.
9. Repeat the steps for the other connected input channels as described above.

• Basic adjustment of the output channels

1. Use the assignment switches (LEDs light) to assign the input channels to the three master channels as desired.
2. For mixing several audio sources to one master channel, adjust the desired volume ratio of the audio sources to one another with the channel faders or level controls of the corresponding input channels.
3. Via its LED level indication, control the level of each master output with the master control. Usually an optimum level control is obtained if the level indication shows values in the 0 dB range at average volume. However, if the output level at the master outputs is too high for the following unit, the master signal must be controlled to a corresponding lower level. If the output level is too low for the following unit, set the rear level selector switch for the master outputs to »1.5 V«.
4. In each master channel, use the 3-way tone control to attenuate or boost the high frequencies (control HI), the midrange frequencies (control MID), and the low frequencies (control LO) and readjust the master level if necessary.
5. The recording signal at the recording outputs REC is taken off ahead of the output controls, i.e. it is not affected by the master controls.

• Microphone announcements

1. Switch on the corresponding microphone with the button ON AIR of the channel (LED lights) and use one of the assignment switches (LED lights) to switch the microphone channel to one of the master channels.
2. To improve the audibility of an announcement during the current music program, press the button ON (LED lights) to activate the talkover function. With the function activated, the levels of the channels 1-5 are automatically attenuated when announcements are made with the microphone. To switch off the talkover function, unlock the button ON (LED off). Use the DB and TIME controls to adjust the attenuation level and response time.

• Prefader listening to the channels
  The cue function allows to monitor each of the channels 1-5 via headphones, even if the corresponding channel fader is set to minimum. Thus, it is possible, e. g. to time the moment for fading in an audio source. Alternatively it is also possible to monitor the current music program ahead of the output controls.

1. For prefader listening to a channel, set the corresponding CUE switch (LED lights) and turn the CUE/PGM control to the left position »CUE«. To monitor the current music program ahead of the output controls, turn the CUE/PGM control to the right position »PGM« and select the desired master channel with the buttons REC SELECT 1 to 3.
2. Adjust the desired headphones volume with the level control.

Cleaning and Maintenance

• Disconnect from mains before starting maintenance operation! We recommend a frequent cleaning of the device. Please use a soft lint-free and moistened cloth. Never use alcohol or solvents!
• There are no serviceable parts inside the device. Maintenance and service operations are only to be carried out by authorized dealers.
• Should you need any spare parts, please use genuine parts. If the power supply cable of this device becomes damaged, it has to be replaced by a special power supply cable available at your dealer.
• Should you have further questions, please contact your dealer.

Technical Specifications

• Power supply: 230 V AC, 50 Hz
• Power consumption: 9 W
• Inputs:
  • Microphone 1/2 : combined XLR/6.3 mm jack (bal.)
  • Line 1-8, MP3: stereo RCA
  • Phono/Aux 1/2: stereo RCA (switchable)
• Outputs:
  • Master 1-3: stereo RCA, stereo XLR
  • Output voltage: 0.75 V/1.5 V RMS (switchable)
  • Record: stereo RCA
  • Headphones: 6.3 mm stereo jack (min. 8 Ω)
• Tone control microphone 1/2:
  • High: ±6 dB/ 12 KHz
  • Mid: ±6 dB/ 1.2 KHz
  • Low: ±6 dB/ 80 Hz
• Tone control master 1-3:
  • High: ±12 dB/ 12 KHz
  • Mid: ±12 dB/ 1.2 KHz
  • Low: ±12 dB/ 80 Hz
• Frequency range: 20-20,000 Hz (mic/line/phono)
• S/N ratio:

  • 70 dB (mic/phono)

  • 60 dB (line)

• Distortion: <0.02 % (line/phono)
• Gain :
  • 52 dB (mic)
  • 17 dB (line)
  • 53 dB (phono)
• Max. output level: +20 dBu (XLR)
• Dimensions (WxHxD): 483 x 148 x 89 mm (19″, 2 U)
• Weight: 3 kg
  Specifications are subject to change without notice due to product improvements

ABOUT COMPANY

• For product updates, documentation, software and support please visit www.omnitronic.de. You can find the latest version of this user manual in the product’s download section.
• © 2023 OMNITRONIC. All rights reserved.
• No part of this document may be reproduced in any form without the written permission of the copyright owner. The contents of this document are subject to revision without notice due to continued progress in methodology, design, and manufacturing.
• All trademarks mentioned herein are the property of their respective owners.
• www.omnitronic.de

References

• Omnitronic: Ihr Hersteller und Großhändler für Audioequipment

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