OMNITRONIC EP-220PS Preamplifier User Manual
- June 5, 2024
- OMNITRONIC
Table of Contents
OMNITRONIC EP-220PS Preamplifier
EP-220PS PREAMPLIFIER
preamplifier with audio player, Bluetooth and FM radio
The EP-220PS is particularly suitable for permanent installations in
restaurants, gyms and retail locations which require quick-access music
playback control. It features 2-way tone control and offers four inputs for
audio units with line signal level (e.g. CD player, tuner, mixer). Stream your
music wirelessly from your smartphone, tablet or computer via Bluetooth to the
built-in audio player, which also offers an FM tuner and slots for USB storage
devices and SD(HC) memory cards. A remote control is included for convenient
control of the audio player. Via the input selector one of the sources can be
selected for playback. The preamplifier is also provided with an adjustable
microphone input. For better intelligibility of an announcement, a priority
function can be activated. Thanks to its separate master outputs the EP-220PS
can be directly connected to active speakers or amplifiers.
Overview of all features
- For quick-access music playback control in restaurants, fitness studios and retail locations
- Built-in audio player with Bluetooth receiver and IR remote control
- Stream music wirelessly from your mobile devices (e.g. smartphone, tablet) via Bluetooth
- USB 2.0 input and SD card slot
- FM tuner with auto scan
- 4 stereo line inputs
- 1 microphone input with controls for volume, bass and treble
- Phantom power and priority circuit switchable for the microphone input
- Controls for overall volume, bass and treble
- Audio source selector
- 5-fold LED level display
- 2 stereo master outputs
- 9.5” desktop console
- Incl. mounting brackets for single and dual rack installation or wall mounting
Introduction
Welcome to Omnitronic! Thank you for choosing one of our products. This user manual will show you how to install and operate the preamplifier. 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. This user manual is valid for item number: 10007081. 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!
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
- The preamplifier is suitable for general professional PA applications and was designed for indoor use only.
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 aprotection 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 allconnections 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 besufficient 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 follow: 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 powersupply 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 connectedwith 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 aminimal 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 coarsemetal 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!
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!
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 deviceexcept 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
- 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 operationmay lead to dangers like short-circuit, burns, electric shock, etc.
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.
Operating Elements and Connections
Front panel
| No. | Element | Function |
|---|---|---|
| 1 | POWER switch | Turns the unit on and off |
| 2 | Audio player with four operating buttons, USB port and SD card reader | • |
►11: play/pause and auto station memory
• V-/ ◄ and V+/ �: previous/next title (short actuation) and volume up/down (long actuation)
• MODE: selects the playback source (Bluetooth, SD card, USB or radio)
3| INPUT SELECT switch| Selects the signal source (LINE 1/2/3/4 or audio
player)
4| MUSIC VOL control| Adjusts the overall volume
5| LED level display| 5-digit level indication for the output signal
6| LOW and HIGH tone controls| Adjust the low and high frequencies for the
output signal
7| MIC VOL control| Adjusts the microphone volume
8| +48 V PHANTOM LED| Lights up when phantom power is activated
9| LOW and HIGH tone controls| Adjust the low and high frequencies for the
microphone signal
10| MIC IN input| Microphone input jack (6.3 mm jack)
Rear panel
| No. | Element | Function |
|---|---|---|
| 11 | EMC input | Line-level input (screw terminals) for important announcements. |
As soon as a signal is present at his input, the other signal sources will be
muted.
12| DIP switches for the microphone input| Switch 1: phantom power on (lower
position) or off (upper position) Switch 2: priority circuit on (lower
position) or off (upper position)
13| Antenna connection| Connection for the included antenna.
14| LINE 1‒4 INPUT jacks| Stereo RCA inputs for audio units with live level
(e.g. CD player, tuner).
15| OUTPUT jacks| Unbalanced and balanced stereo outputs (RCA and plug-in
screw terminals) for connection to units with line level inputs (e.g. mixer or
additional amplifier).
16| Power input| Used to plug in the supplied power cable.
Installation
The device can be used as a tabletop unit or can fastened to the wall and a
19″ (483 mm) rack using the mounting material provided. The screws should not
be longer than 8 mm. The safest way to avoid mistakes and damage to the device
is to use the provided screws. Delivery includes device feet that can be
fitted to the corners of the device. In order to ensure sufficient cooling,
air must always be able to flow freely through all air vents. Steady
overheating will damage the amplifier.
Rack installation
To mount a device in a rack, remove 2 screws from each side of the device and
screw the long brackets (type A) in place as shown. Slide the unit into the
rack and secure it with 4 M6 screws. 
Using a short bracket (type B) and two long brackets (type A), 2 devices can
be mounted side by side and installed in a rack. Start by removing 3 screws
from the sides of the first device (Fig. a) and attach the short bracket (Fig.
b). Then place both devices side by side upside-down. Remove the screws from
the bottom of the second unit (Fig. c), align the units and screw the short
bracket to the second unit. 
Finally, attach the long brackets (type A) as described above and mount the
connected devices in the rack (Fig. d). 
Surface mounting
Using the short brackets (type B) it is possible to mount the device
vertically on a wall or upside down under a table. In the latter case, simply
turn the brackets around (figure b). If the brackets are to be hidden under
the unit, refer to figure c. In each case, remove 3 screws from each side of
the device and attach the brackets. 
Using the connection plate C, 2 devices can be mounted on top of each other. To do this, remove 2 screws from each side of the unit and attach the connecting plate as shown.
Connections
- Four audio units with line level (e.g. CD player, tuner, mixer) can be connected to the stereo RCA jacks LINE INPUT 1 to 4. Always connect the left channel to the white jack and the right channel to the red jack.
- Use the MIC IN jack to connect a microphone via a 6.3 mm jack plug. To enable the priority circuit set DIP switch 1 to the lower position. In case of an announcement the level of the other signal sources is attenuated. After the announcement, the level of the other signal sources slowly returns to the original level. To enable a +48 V phantom power for condenser microphones set DIP switch 2 to the lower position. 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.
- Use the EMC INPUT screw terminals to connect a telephone system. As soon as a signal is applied to this input, the other signal sources are muted.
- For FM reception connect the included antenna to the FM ANT socket and put it in a vertical position.
- Active speakers, amplifiers or subsequent units with line level can be connected to the unbalanced RCA outputs and/or to the balanced plug-in screw terminals. Balanced signal transmission will improve interference suppression. For unbalanced use, connect the terminals “−“ and “G” of the corresponding output with each other. Then connect the signal conductor to the terminal “+” of the output and the ground conductor to the terminal “G”. To facilitate handling, it is possible to remove the screw terminals from their plug-in connections and to reinsert them after connection.
- Finally connect the preamplifier to a mains outlet with the mains cable. The device uses an auto-range power supply that accepts input voltages between 100 und 240 volts.
Operation
- Before switching on the preamplifier for the first time, set the two volume controls to zero to make sure that the initial volume will not be too high.
- Use the POWER switch to switch the preamplifier on and off.
- Use the INPUT SELECT switch to select signal source and adjust the desired volume with the MUSIC VOL control. The 5-step LED row shows the output level. The red LEDs lights up in case of overload. If they light permanently, slightly turn back the volume control.
- Adjust the desired sound with the tone controls. By adjusting the tone controls, the high frequencies (control) and the low frequencies (control LOW) can be boosted or attenuated. With the controls in mid-position, the frequency response is not affected.
- Mix the microphone signal to the master signal with the MIC VOL control and adjust the sound with the LOW and HIGH controls. If the priority function is activated, the volume of the other signal sources is automatically lowered when an announcement is made. After the announcement, the level of the other signal sources slowly returns to the original level.
Audio player
The preamplifier 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. The integrated FM tuner
provides automatic station memory. Use the MODE button to select the desired
signal source. Then set the INPUT SELECT switch to the PLAYER position to
assign the signal of the audio player to the outputs. The audio player can
either be operated via the buttons on the front panel or via the remote
control.
Setting up a Bluetooth connection with mobile devices
Press the MODE button (repeatedly) until the display indicates “BLUE“. 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. You can operate the Bluetooth source with the remote
control, too. 
USB devices and memory cards
Insert a USB device into the USB port and/or a memory card into the card slot.
The display indicates “USB“ or “SD“. After loading a data carrier, it is
selected as the playback medium and the playback will start automatically. Use
the remote control to operate the music conveniently from a distance.
Tuner mode
The button starts the automatic station memory (or U/SD on the remote
Control). The automatic station memory will be running forward and stores
stations with good reception. Stored stations can be called with the buttons
and . For direct selection of a station use the numerical keys [0-9] on the
remote control.
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.
Notes
- The remote control is supplied with a battery inserted. An insulating foil between the battery and the battery contacts prevents the battery from being discharged during storage. Prior to the first operation remove the foil from the battery support on the rear side of the remote control. Otherwise, the operation of the remote control is not possible.
- If the range of the remote control decreases, replace the battery. For this purpose, on the rear side of the remote control press the small bar with the groove to the right and at the same time remove the battery support. For operation, one 3 V button cell type CR 2025 is required. When inserting, pay attention that the positive pole of the button cell shows upwards in the support.
- Remove the battery from the remote control as a precaution if the device is not used for a longer period of time.
Cleaning and Maintenance
DANGER TO LIFE! Disconnect from mains before starting maintenance operation!
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
EP-220PS
Power supply:| 100-240 V AC, 50/60 Hz
Power consumption:| 8 W
Frequency range:| 20-20000 Hz, ± 0.5 dB
Distortion factor:| 0.1 %
S/N ratio:| 100 dB
Input impedance:| 20 kΩ (balanced), 10 kΩ (unbalanced)
Input sensitivity:| 1 V
Input connectors:|
Line 1-4:| RCA L/R
Mic:| 6.3 mm jack, bal. (+48 V phantom power, switchable)
EMC:| Plug-in screw connectors
Output connectors:| RCA L/R and plug-in screw connectors
Control elements:| Power switch, source selector, level/tone controls
LED indicators:| Output level, phantom power
Construction:| Steel chassis, aluminum front
Audio player:| Bluetooth, USB, SD(HC), FM tuner
Playback format:| MP3, WMA, WAV
Available storage media:| USB devices and SD(HC) cards up to 32 GB
File system:| FAT16/32
Tuner frequency range:| FM 87.5-108 MHz
Station memory:| 32
Bluetooth:|
Carrier frequency:| 2.4 GHz
Range:| approx. 10 m
Battery remote control:| CR2025
Dimensions (DxWxH):| 256 x 241 x 44 mm
Rack installation with 1 U with supplied mounting brackets
Weight:| 1.7 kg
Cable connections
The preamplifier offers various 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. 