OMNITRONIC TRM-422 4-Channel Rotary Mixer User Manual

: June 6, 2024
: OMNITRONIC

Table of Contents

Introduction
Product features
Safety Instructions
Operating Elements and Connections
Setup
Technical Specifications
References
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TRM-422 4-Channel Rotary Mixer
User Manualhttp://eshop.steinigke.de/Omnitronic/

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.
© 2021 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.
D00137130, version 1.0, publ. 21/02/2022

Introduction

Welcome to Omnitronic! Thank you for choosing one of our products.
This user manual will show you how to install and operate the mixing console. Users of this product are recommended to carefully read all warnings in this manual and on the unit in order to protect themselves and others from damage.
This user manual is valid for item number: 10355931. Please save this document for future needs and pass it on to further owners.

Product features

Classic rotary mixer with 4+2 input channels and integrated frequency isolator for DJs
High-grade components ensure long life and excellent sound quality
4 stereo input channels with gain control, clip LED, 3-way equalizer, and phono/line switching
2 microphone input channels with gain control, 2-way equalizer on-air switch
3-band master frequency isolator with vintage ALPS potentiometers (Blue Velvet RK27)
Kill cut feature allows DJs to completely remove low, mid, and high frequencies for amazing mixing
Filter section with HPF, BPF, LPF, resonance, and sweep control for creative sound shaping
16-digit stereo LED level meter, switchable between master and booth outputs
Booth output with a separate 2-way equalizer and level control
PFL section with 16-digit stereo LED level meter, level control, PFL/master mix control, and cue mix/split option
Fully assignable VCA crossfader with adjustable curve
2 effects send/return paths
4 direct outputs for Timecode applications
Inputs: 8 x line and 4 x phono (RCA L/R), 1 x front aux (mini jack)
Outputs: master and booth (XLR/RCA L/R) and record (RCA L/R)

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.

Intended Use

This device is used to mix line and phone signal sources. It has been specially designed for DJs.

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 I. The power plug must only be plugged into a protection class I outlet. 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.
Disregarding 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.
The occupation of the connection cables is as follows: Cable| Pin| International
---|---|---
Brown| Live| L
Blue| Neutral| N
Yellow/Green| Earth|

The earth has to be connected! If the device will be directly connected with the local power supply network, a disconnection switch with a minimum opening of 3 mm at every pole has to be included in the permanent electrical installation. The device must only be connected with an electric installation carried out in compliance with the IEC standards. The electric installation must be equipped with a Residual Current Device.

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 short-circuits caused by metal parts may cause mortal injuries.

Ambient Conditions

The ambient temperature must always be between -5° C and +45° C. Keep away from from irect 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 at an altitude between -20 and 2000 m over NN.
Never use the device during thunderstorms.
Overvoltage 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 at a distance of 0.5 meters between the smoke machine and the device.

Setup
Operate the device only after having familiarized it with its functions. Do not permit operation by persons not qualified for operating the device.
Most damages are the result of unprofessional operation!

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 except for the fuse. Maintenance and service operations are only to be carried out by authorized dealers! Should you need any spare art, 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.

WEEE Directive
If the unit is to be put out of operation definitively, take it to a local recycling plant for disposal that is not harmful to the environment. Do not dispose of as municipal waste. Contact your retailer or local authorities for more information.

Operating Elements and Connections

Rear panel

OMNITRONIC TRM 422 4 Channel Rotary Mixer - figure 1

Top panel

OMNITRONIC TRM 422 4 Channel Rotary Mixer - figure 2

Front panel

OMNITRONIC TRM 422 4 Channel Rotary Mixer - figure 3

No.| Element|

Function

---|---|---
1| EXT FX OUT/IN connectors| The FX OUT jack routes the post-fader signal of the individual channels to an external effects processor. The FX IN jack accepts the effects mix return. Both jacks are on unbalanced 6.3 mm jacks. Alternatively, the FX OUT socket can be used to connect another amplifier, e.g. for the PA application in a secondary room.
2| Balanced MASTER output| Balanced stereo XLR output carrying the master output signal controlled by the main output level control (30); for connecting a power amplifier.
Note: Always use the balanced master output for cables that runs greater than 5 meters.
3| Unbalanced MASTER output| Unbalanced RCA output carrying the same signal as output (2).
4| Balanced BOOTH output| Balanced stereo XLR output carrying the booth output signal controlled by the booth output level control (31); for connecting a further amplifier e.g. for the monitoring system.
5| Unbalanced BOOTH output| Unbalanced RCA output carrying the same signal as output (4).
6| Record output| Unbalanced stereo RCA output carrying the master bus signal independent of the master level control (30).
7| Effect path Send/Return connectors| With these connections, it is possible to route the master signal out of the mixing console, loop it through an external effects device and return it to the mixing console. Connect the input of the effects device to the SEND sockets and the output to the RETURN sockets. Use the switch (37) to send the effect signal to the master bus.
Note: If these connections are not used, utilize the jumper cable to prevent signal drop outs in case of accidental operation of the switch (37) for the effect path.
8| LINE 1 to 7 / PHONO 1 to 4 inputs| Stereo inputs (RCA) for channels 1-4 for connecting units with line-level outputs such as CD players or turntables with a magnetic system. Set the line/phono switch (9) according to the source used. The front input selector switches (18) must be set to the left to select these inputs.
Note: The short-circuit plugs on the phono inputs prevent noise from getting inside unused inputs. The plugs must not be connected to the outputs, otherwise, there will be a short circuit and there is no output signal.
9| Line/phono switch| Input source selector switch for channel 1-4: button pressed = line level, button released = phono level.
Note: Switch off the unit before changing the position of a switch.
10| TIMECODE outputs| Unbalanced stereo RCA outputs for channels 1-4 carrying the signal of the inputs (8) above; specifically designed for Timecode applications. Connect the input of the Timecode system here. The inputs below (11) accept the Timecode return signal.
11| LINE 2 to 6 inputs| Unbalanced stereo RCA inputs for channels 1-4; specifically
designed for Timecode applications. Use these inputs to connect the outputs of the Timecode system. The front input selector switches (18) must be set to the right to select these inputs. Alternatively, you may use the inputs for connecting additional line-level units.
12| MIC 1 and 2 inputs| Balanced XLR jack connectors for microphones. Switch on the microphones with the corresponding input selector switch (45). Adjust the microphone volume with the VOL control (44) and the sound with the HIGH/LOW controls (46).
Please note that no phantom power is available for these inputs, so they can only be used with dynamic microphones.
13| Ground clamping screws| Ground clamping screws for turntables.
14| Power switch| Turns the unit on and off. The power indicator lights up when the unit is turned on.
15| Power input with fuse holder| Used to plug in the supplied power cable. Only replace the fuse when the device is disconnected from mains. Only use fuses of the same rating and power. The correct fuse value is specified on the rear panel.
16| CLIP LED| Indicates when the level after the gain control (16) reaches 0 dB, to allow proper input gain setting depending on the connected audio source.
17| GAIN control| Allows compensating for different source levels in channels 1-4. To facilitate proper setting of gain levels, each channel has an additional CLIP LED (16) which illuminates at 0 dB to give an indication when a suitable gain value is set.
18| Input selector switch| Select one of the rear-panel sources to be used with the respective input channel.
19| HIGH/MID/LOW tone controls| Allows the adjustment of the tonal balance for each of the inputs separately in three music-specific frequency bands with an adjustment range of ±10 dB.
20| FILTER assign switches with LED| When this button is pressed, the channel signal (post-fader) is routed through the filter section (LED lights up).
21| Crossfader assignment switch| Allows to send the respective channel’s signal either directly to the master bus, or to the left side of the crossfader (39) when set to position “A”, or to the right side of the crossfader when set to the position “B”. When all input channels are assigned directly to the master bus, the crossfader is disabled and the desired volume ratio can be set with the channel controls.
22| CUE assign switch with LED| Assigns the respective channel to the headphone bus for pre-faderlistening (PFL) by means of the headphone output (47). The LED indicates the pressed position.
23| Channel controls| To set the volume for each stereo input channel 1-4.
24| Stereo VU meter CUE LEVEL| Displays the output level of the monitor (PFL) signal at the
headphone output (47) within the range of -32 dB to +13 dB.
25| AUX input for channel 4| 3.5 mm jack input for connecting additional audio sources like smartphones or portable MP3 players etc. To activate this input, press the adjacent on/off switch (26) and set the input selector switch (18) of channel 4 accordingly.
26| On/off switch with LED| When the button is pressed, the AUX signal is switched to channel 4 (LED lights up). The input selector switch (18) in channel 4 must be set to the right to select the AUX input.
27| Power indicator| Lights up when the unit is turned on.
28| VU meter assign switch| Selects either the master or booth signal to be displayed on the main level meter (29).
29| Stereo VU meter
MASTER LEVEL| Displays the output level (within the range of -32 dB to +13 dB) of either the master or booth signal, depending on the setting of the display selector switch (28).
30| MASTER volume control| This control sets the signal level at the master outputs (2 and 3). Note: Prior to switching on, turn the master control to a minimum to avoid a possible switching-on noise.
31| BOOTH volume control| Sets the signal level at the booth outputs (4 and 5).
32| HIGH/LOW tone controls| Allows the adjustment of the high and low range for the booth outputs with an adjustment range of ±10 dB.
33| RES control| Adjusts the resonance or intensity of the filter. The more the control is turned up, the more the frequencies around the cutoff range are amplified and a change of timbre is created that makes the audio signal seem synthetic. The sound varies according to the filter type selected. To avoid unexpected results it is best to start experimenting with the control set to a low position.
k| Filter type selector switch| Selects the filter type:
• HP (high-pass filter): low frequencies are attenuated.
• BP (band-pass filter): low and high frequencies are attenuated and only a narrow band in the mid-frequency range remains.
• LP (low-pass filter): high frequencies are attenuated.
35| FQ sweep control| Sweeps the filter frequency from low to high. The more the control is turned up, the more higher the audio frequencies should be audible. Rotate the control during your performance to produce dynamic sweeping effects.
Tip: Take some time to experiment with the filter settings before your first live performance.
36| On/off switch for the filter| If the switch is set to the right, the filter is activated and the audio signal is processed.
37| On/off switch with LED| Pressing this switch will add the effects signal present at the effects Return jacks (7) to the master bus. Releasing this switch will remove the effects signal from the master bus. The LED indicates the status (lit when pressed).
38| HIGH/MID/BASS master isolator controls| Allow the adjustment of the high, mid, and low range for the master outputs. If control is turned to the left stop position, the corresponding frequency band is completely removed (kill cut). This feature can be used e.g. for acapella effects or to cut vocals and melody from the source material.
39| Crossfader| Determines the mix ratio between the stereo signals assigned to its left side and the stereo signals assigned to its right side (via switches 21). The crossfader can be disabled setting all switches to “THRU”.
40| PFL mode switch| This toggle switch offers two pre-listening modes. Flip to the right to select SPLIT mode: the master signal appears on one earcup of the headphones, the PFL signal on the other earcup. Flip to the left to select CUE MIX. In this mode, master and PFL signals are mixed with an adjustable ratio by means of control (42).
41| CUE VOL control| Determines the signal volume at the headphone output (47).
42| CUE MIX control| Allows the headphone signal to be a mix of the master output and the input(s) assigned to the PFL bus by means of switches (22). This control determines the mix ratio between the main and the PFL signal.
43| CUE switch with LED| Assigns the respective channel to the headphone bus for pre-faderlistening (PFL) by means of the headphone output (47). The LED indicates the pressed position.
44| VOL control| Volume controls for the MIC 1 and 2 microphone channels.
45| ON AIR switches| Flip to the right to enable the relative microphone channels.
46| HIGH/LOW tone controls| Allows the adjustment of the high and low range for the MIC 1 and 2 microphone channels with an adjustment range of ±18 dB
47| Headphones output| 3.5 mm/6.3 mm jacks for connecting stereo headphones. Turn the level control (41) down before plugging in any headphones, as the sudden high-volume impact may damage your ears.
48| CROSSFADER SLOPE control| Adjusts the characteristic of the crossfader. Turn counterclockwise for smooth crossfading (e.g. for long mixes) and clockwise for sharp crossfading (e.g. for scratching and cutting).

Setup

Cable connections
The console 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 channel fader and output controls to a minimum prior to connecting and disconnecting equipment. Be sure to use only high-grade cables. The illustrations below show the wiring of these cables.

OMNITRONIC TRM 422 4 Channel Rotary Mixer - figure 4

Powering up
To protect your audio equipment, specifically, your speakers, follow this power-up sequence: Set all output volume controls of any equipment to a 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.