OMNITRONIC MA Series PA Mixing Amplifier User Manual

OMNITRONIC MA Series PA Mixing Amplifier

OVERVIEW

PA mono mixing amplifier with 60-360 watts power and audio player
The amplifiers of the MA series have been specially designed for the use in 100 V PA systems. PA speakers with 70 V and 100 V audio transformers or 4-16 Ω speakers can be connected. It is possible to connect microphones and units with line level to the six inputs which can be mixed with each other. Microphone channel 1 is equipped with a priority function which reduces the volume of the other signal sources in case of an announcement. The PA amplifiers are provided with a built-in audio player for MP3 files from USB storage devices and SD(HC) cards as well as wireless music streaming from your Bluetooth devices such as smartphones, tablets and notebooks. An IR remote control is included for convenient control of the audio player. 100V PA installation must be made by skilled personnel only.

Overview of all features

• PA outputs for 70 V or 100 V PA speakers
• PA outputs for low-impedance speakers (4-16 ohms)
• Stream music wirelessly from your mobile devices (e.g. smartphone, tablet) via Bluetooth
• SD card slot and USB port
• Folder navigation and repeat functions (1, All)
• 3 microphone inputs with separate level controls
• Mic 1 with phantom power and priority circuit
• Mic 2 and 3 switchable mic/line
• 2 line inputs with separate level controls
• 1 line output
• Treble and bass and master controls for the output signal
• 5-digit LED level meter
• Chime, switchable
• Protection circuits with LED indication: overload, short circuit, clip limiter, overheat

Introduction

Welcome to Omnitronic! Thank you for choosing one of our products. This user manual will show you how to install and operate the PA amplifier. 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 numbers:

80709612, 80709622, 80709632, 80709646.

Please save this document for future needs and pass it on to further owners.

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!
• HEALTH HAZARD! By operating speaker systems with an amplifier, you can produce excessive sound pressure levels that may lead to permanent hearing loss.

This PA system 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 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. 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.

The occupation of the connection cables is as follows:

• 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 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.

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!
• Never install the amplifier next to highly sensitive devices like pre-amplifiers or tape decks, as the strong magnetic field of the amplifier can produce hum in these devices. The magnetic field is strongest directly above or below the amplifier. If a rack is used, the amplifier should be installed at the bottom and the highly sensitive devices at the top.

Commercial Use

• Operating an amplification system in public or industrial areas, a series of safety instructions have to be followed. The operator must therefore inform himself on the current safety instructions and consider them.

Setup

• 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!
• Before the unit is switched on all faders and volume controls have to be set to zero or minimum position. Turn the amplifier on last and off first!Only connect the device when the power switch is off. Never connect output to output. Never connect the inputs or outputs to any power source (batteries, etc.)

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 parts, please use genuine parts.

Modifications and Guarantee

• Never remove the serial barcode from the device as this would make the guarantee void.
• 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.

Maximum Power

• The given maximum power of the speaker system describes short-term peaks the system can handle as a maximum. The correspondent RMS power is -as of all comparable systems (also from other manufacturers) – significantly lower. The maximum power of the speaker system must never be exceeded. When operating the speaker system, please make sure that the loudspeakers always sound well. When distortions can be heard, either the amplifier or the loudspeaker is overloaded. Overloads can quickly lead to an amplifier or speaker damage. In order to avoid damage, please reduce the volume immediately when distortions can be heard. When speaker systems are destroyed by overload, the guarantee becomes void.

Batteries

• Do not try to short-circuit, recharge, disassemble or heat batteries (danger of explosion!). Remove the batteries if the device is not used for a longer period of time. Damaged/leaking batteries may cause harm to your skin–use safety gloves.

Intended Use

• The PA mono-mixing amplifiers of the MA series have been specially designed for use in 100 V PA systems.

Operating Elements and Connections

Front panel

MODE: selects the source (Bluetooth, SD card or USB)

•   PLAY/PAUSE: play/pause and confirm in folder mode

•   FOLDER: folder mode

•   REPEAT: selects random play and repeat functions

•   PREV and NEXT: previous/next title or folder (short actuation), fast rewind/forward (long actuation)

2| Infrared sensor for the remote control| When actuating a button, always direct the remote control towards the sensor. There must be no obstacles between remote control and the sensor.
3| CHIME button| For releasing the chime.
4| Status indicators| •   -15/-10/-6/-3/0: level indication for the audio signal

•   Clip: lights up in case of overload

•   Fault: lights up with activated protective circuit

•   Power: lights up when the amplifier is turned on

5| POWER switch| Turns the amplifier on and off.
6| MIC 1 control| Level control for microphone input 1. This input has a priority circuit which can be enabled with DIP switch 4 on the rear panel.
7| MIC 2/LINE 1 control| Level control for microphone input 2 or line input 1.
8| MIC 3/LINE 2 control| Level control for microphone input 3 or line input 2.
9| LINE 3 control| Level control for line input 3.
10| LINE 4 control| Level control for line input 4.
11| PLAYER control| Level control for the audio player.
12| BASS control| Tone control for the low frequencies of the mixed signal.
13| TREBLE control| Tone control for the high frequencies of the mixed signal.
14| MASTER control| Controls the volume of the mixed signal at the speaker outputs.
15| Air vents| The amplifiers use a forced-air cooling system, allowing high continuous power levels without thermal problems.

Rear panel

mains. Only use a fuse of the same rating and power. The correct fuse value is specified on the rear panel.
17| Mains cable| For connection to a mains outlet.
18| SPEAKER OUTPUT terminals| •   70V/100V: for connecting 70 V and 100 V speakers

•   4Ω/8Ω/16Ω: for connecting 4-16 Ω speakers

•   COM: common ground connection for all speakers

19| Line output| Stereo RCA output for connection to units with line level inputs (e.g. mixer, amplifier).
20| LINE 4 input| Stereo RCA inputs for connecting units with line level (e.g. CD player).
21| LINE 3 input| Stereo RCA inputs for connecting units with line level (e.g. CD player).
22| MIC 3/LINE 2 input| Unbalanced 6.3 mm jack for connecting a dynamic microphone or a line level audio device.
23| MIC 2/LINE 1 input| Unbalanced 6.3 mm jack for connecting a dynamic microphone or a line level audio device.
24| DIP switches| •   1 and 2: line level (upper position) or microphone level (lower position) at inputs MIC 3/LINE 2 or MIC 2/LINE 1

•   3: phantom power on (upper position) or off (lower position) at input MIC 1

•   4: priority circuit on (upper position) or off (lower position) at input MIC 1

25| MIC 1 input| Balanced XLR jack for connecting a microphone. For a phantom- powered microphone set DIP switch 3 to the upper position. To enable the priority circuit for this input, set DIP switch 4 to the upper position. Then the level of the other inputs is attenuated when an announcement is made via this input.

Installation

This amplifier is built for 19″ racks (483 mm) but can also be used as a tabletop unit. In order to ensure sufficient cooling of the amplifier, air must always be able to flow freely through all air vents. For rack installation, the amplifier requires 2 U. If several units are to be installed, make sure that you leave 1 unit space between the devices. Insert the heaviest units into the lower part of the rack. The hot air given off by the amplifier must be dissipated from the rack; otherwise, heat will accumulate in the rack which may not only damage the amplifier but also other units in the rack. In case of insufficient heat dissipation, install a ventilation unit into the rack.

Connections

Speakers

DANGER TO LIFE!

High voltage at terminals when using PA systems. Installation by skilled personnel only! Turn off the amplifier before connecting. Either PA speakers with 70 V and 100 V audio transformers or 4-16 Ω speakers or speaker groups can be connected. The total load must not exceed 60 WRMS (MA-60P), 120 WRMS (MA-120P), 240 WRMS (MA-240P) or 360 WRMS (MA-360P) otherwise the amplifier may be damaged by overload. When connecting, observe the correct polarity (positive and negative connections). The positive connection of the speaker cables is always specially marked

• 70/100 V: Connect PA speakers to the terminals “COM” (negative pole) and “70V” or “100V” (positive pole).
• 4-16 Ω: Connect low-impedance speakers to the terminals “COM” (negative pole) and “4Ω”, “8Ω” or “16 Ω” (positive pole). When interconnecting several low-impedance speakers, it is especially important to obtain the minimum impedance at the respective terminal. The input impedance of the speaker systems should at least be the same or even higher than the output impedance of the amplifier.

Example for the calculation number of speakers/impedance:

Audio units

• MIC 1: The rear panel provides a balanced XLR input for connecting a microphone. To enable a +48 V phantom power for condenser microphones set DIP switch 3 to the upper position. Alternatively, use the unbalanced 6.3 mm jack for connecting a dynamic microphone. The level is adjusted by the “MIC 1” control.
  Caution!
  If the phantom power is switched on, no microphone with unbalanced output must be connected. Otherwise this microphone may be damaged. To prevent switching noise, only switch on phantom power when the amplifier is switched off or when all output controls are set to minimum.
  To enable the priority circuit set DIP switch 4 to the upper position. In case of an announcement via this input, the level of the other channels is attenuated. After the announcement, the level of the other channels slowly returns to the original level.

• MIC 2-3/LINE 1-2: These unbalanced 6.3 mm jacks connect both dynamic microphones and units with line level. Set DIP switch 1 and/or 2 to the lower position for the microphone level or to the upper position for the line level. The level is adjusted by the front controls (8) and (9).

• LINE 3-4: Use these unbalanced RCA jacks to connect units with line level (e.g. CD players). The level is adjusted by the front controls (10) and (11).

• LINE OUT: This unbalanced RCA output provides the mixed signal to connect, e.g. an additional amplifier

Connection with the mains
Finally, connect the device to a mains outlet with the mains cable.

Operation

Amplifier

1. To prevent loud switching noise, first switch on all other units of the PA system.
2. Prior to switching on, turn the “MASTER” control and the level controls of the input channels to zero to avoid a high volume at the beginning. Then switch on the unit with the power switch. The “Power” indicator lights up.
3. Turn up the “MASTER” control so that the mixing ration of the signal sources can be adjusted in an optimum way.
4. Adjust the desired volume ratio with the level controls of the channels “MIC” and “LINE”. Turn the controls of the inputs not used to zero.
5. To improve the audibility of an announcement via microphone channel 1 set DIP switch 4 to the upper position. In case of an announcement via this input, the level of the other channels is attenuated. After the announcement, the level of the other channels slowly returns to the original level.
6. To release the chime prior to an announcement, press the button “CHIME”. Then the level of the channels is attenuated also.
7. Adjust the desired sound with the tone controls. By adjusting the tone controls, the high frequencies (control “TREBLE”) and the low frequencies (control “BASS”) can be boosted or attenuated. With the controls in mid-position, the frequency response is not affected.
8. Adjust the definite level of the total volume with the “MASTER” control. The 5-step LED row shows the output level. The red “Clip” LED lights up in case of overload. If it lights permanently, slightly turns back the master control.

Audio Player
The amplifier features an audio player for MP3 files from USB storage devices and SD cards as well as wireless music streaming from your Bluetooth devices such as smartphones, tablets, and notebooks. Use the “MODE” button to select the desired signal source. The audio player can either be operated via the buttons on the front panel or via the remote control. The level is adjusted by the “PLAYER” control.
Setting up a Bluetooth connection with mobile devices
Press the “MODE” button (repeatedly) until the display indicates “Bluetooth”. The audio player will enter the pairing mode. Now activate the Bluetooth function at the Bluetooth source and start the device scan. Select “OMNITRONIC” from the list and connect the devices. Then play music at the Bluetooth source as you normally would and the sound will come out of the speakers. You can operate the Bluetooth source with the remote control, too .

USB devices and memory cards
Insert a USB device into the USB port. Slide memory cards into the card slot with the contacts facing right. The display indicates the source selected. After loading a data carrier, it is selected as the playback medium and the playback will start automatically. To select folders on the player, first press the “FOLDER” button to activate folder selection mode. Then use the “PREV” and “NEXT” buttons to browse the folders. Press “PLAY/PAUSE“ to confirm a selection (highlighted) and start playback.
Remote control

Before first operation, pull out the insulating foil on the back. To change the battery, press the small latch with the notch to the right and pull out the battery holder. Insert a button cell type CR2025 into the holder with the positive pole facing upwards. Remove the battery when not in use for a longer period of time.

Protective circuits
The protective circuits prevent damage to the speakers and the amplifier. If activated, the speakers are electrically separated from the amplifier and the LED “Fault” lights up:

• for a few seconds after switching-on until the speaker outputs are ready for operation
• in case of overheating of the amplifier
• in case of a short-circuit at a speaker output
• in case of a DC voltage at a speaker output
• If the red LED “Fault” lights up during operation or if it does not extinguish after switching on, the amplifier has to be switched off and the cause of the fault has to be removed.

Problem Chart

and any extension cables.
No sound.| ·    The power cord of the respective device is not connected properly or not connected at all or is defective.

·    The connection socket or the plug is dirty.

| ·    Check the power cord and if the plugs are tightly connected with the sockets.

·    Clean the socket and/or the plug.

LED Fault lights up permanently.| ·    Inputs receive DC voltage.

·    Amplifier is overheated due to impurities or heat accumulation.

·    Impedance of speakers too low.

·    Short-circuit in speaker connection or in speakers.

·    Technical default of amplifier.

| ·    Switch amplifier off and have the device checked by a service- technician.

·    Clean the fan grille.

·    Provide for sufficient air circulation.

·    Connect other speakers.

·    Check speakers.

·    Switch amplifier off and have the device checked by a service technician.

Cleaning and Maintenance

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 except for the fuse. 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.
Replacing the fuse
If the fine-wire fuse of the device fuses, only replace the fuse by a fuse of same type and rating. Before replacing the fuse, unplug mains lead.
Procedure:

• Step 1: Open the fuseholder on the rear panel with a fitting screwdriver.
• Step 2: Remove the old fuse from the fuseholder.
• Step 3: Install the new fuse in the fuseholder.
• Step 4: Replace the fuseholder in the housing.

Technical Specifications

MA 60P I 120P I 240P I 360P

Power supply:| 230 V~ 50 Hz
Output power/power consumption:| MA-60P: 60 WRMS / 120 W

MA-120P: 120 WRMS / 240 W

MA-240P: 240 WRMS / 480 W

MA-360P: 360 WRMS / 720 W

Speaker outputs:| 70 V, 100 V, 4-16 W (screw connectors)
Line output:| RCA
Input Mic 1:| 6.3 mm jack and XLR (+48 V phantom power, switchable)
Input Mic 2, 3 / Line 1, 2:| 6.3 mm jack
Input Line 3, 4:| RCA
Frequency range:| 50 Hz – 18 kHz
Distortion:| 0.5 % (1 kHz)
S/N ratio:| 85 dB (line), 75 dB (mic)
Protection:| Over current, short circuit, turn-on delay
Indicators:| Power, fault, level
Dimensions:| 483 x 400 x 92 mm
Weight:| MA-60P: 9.5 kg

MA-120P: 10.2 kg

MA-240P: 12.8 kg

MA-360P: 14 kg

Audio player| Bluetooth, USB, SD(HC)
Playback format:| MP3
Available storage media:| USB devices and SD(HC) cards up to 32 GB
File system:| FAT32
Number of files:| max. 999
Remote control|
Battery:| CR2025

Battery: CR2025
Specifications are subject to change without notice due to product improvements.

Cable connections
The amplifier offers numerous, highly flexible possibilities for balanced or unbalanced connection of professional audio equipment. To avoid interfering noise, switch off the device or set the output controls to minimum prior to connecting and disconnecting equipment. Be sure to use only high-grade cables. The illustrations below show the wiring of these cables.

Protecting the Environment

Disposal of old equipment

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. You as the end user are required by law (Battery Ordinance) to return all used batteries/rechargeable batteries. Disposing of them in the household waste is prohibited. You may return your used batteries free of charge to collection points in your municipality and anywhere where batteries/ rechargeable batteries are sold. By disposing of used devices and batteries correctly, you contribute to the protection of the environment.

Omnitronic is a brand of Steinigke Showtechnic GmbH · Andreas-Bauer-Str. 5 · 97297 Waldbüttelbrunn Germany D00140942 Version 1.0 Publ. 11/07/2022

• www.oMNITRoNIC.DE
• TECHNOLoGY DESIGNED FOR PLEASURE

Documents / Resources

| OMNITRONIC MA Series PA Mixing Amplifier [pdf] User Manual
MA Series PA Mixing Amplifier, MA Series, PA Mixing Amplifier, Amplifier
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References

• Omnitronic: Ihr Hersteller und Großhändler für Audioequipment

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