Omnitronic MP-120P PA Mixer Amplifier User Manual

Introduction

Thank you for choosing the Omnitronic MP-120P PA Mixer Amplifier. This manual provides essential information for the safe and efficient operation of your device. Please read it thoroughly before initial use and keep it for future reference. The MP-120P is a versatile mono PA mixer amplifier designed for public address systems, featuring an integrated MP3 player, multiple input options, and flexible speaker outputs.

Safety Instructions

Important Safety Information:

• Read these instructions carefully.
• Keep these instructions for future reference.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with a dry cloth.
• Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
• Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

Product Overview

Figure 0: Omnitronic MP-120P PA Mixer Amplifier. This image provides a general view of the amplifier, showcasing its robust design and front panel layout.

Key Features

• Mono PA mixer amplifier with integrated MP3 player and IR remote control.
• Outputs for 70 V or 100 V PA speakers or low-impedance speakers (4-16 ohms).
• MP3 player with IR remote control and LCD screen with blue backlight.
• SD card slot and USB input for media playback.
• Folder navigation and repeat functions (single, all).
• Microphone inputs (6.3 mm jack, unbalanced) with separate level adjustments.
• Microphone input 3 features an adjustable priority circuit.
• Line inputs (stereo RCA) with separate level adjustments.
• Line output (stereo RCA) for connecting to external devices.
• Switchable chime function.
• Treble and bass controls for the output signal.
• LED level display.
• Master level control for output circuits.
• Fan-cooled design.
• Protection circuit with LED indication for over current, short circuit, and turn-on delay.

Front Panel Controls

The front panel provides access to all essential controls and the integrated MP3 player.

Figure 1: Front Panel Layout. This image displays the front of the Omnitronic MP-120P, highlighting the power switch, USB and SD card slots for the MP3 player, LCD display, master volume, treble and bass controls, and individual level controls for line and microphone inputs.

1. POWER Switch: Turns the unit on or off.
2. USB Port: Connect USB flash drives for MP3 playback.
3. SD CARD Slot: Insert SD cards for MP3 playback.
4. MP3 Player Controls & LCD Display: For navigating tracks, adjusting volume, and viewing playback information.
5. MASTER Volume: Adjusts the overall output volume.
6. TREBLE Control: Adjusts the high-frequency response of the output.
7. BASS Control: Adjusts the low-frequency response of the output.
8. LINE/MP3 Level Controls: Adjusts the volume for Line 1 and the MP3 player.
9. LINE 2, LINE 3 Level Controls: Adjusts the volume for respective line inputs.
10. MIC 1, MIC 2 Level Controls: Adjusts the volume for microphone inputs 1 and 2.
11. MIC 3 / PRIORITY MIC Level Control: Adjusts the volume for microphone input 3, which also features a priority function.
12. CHIME Button: Activates the chime sound.
13. LED Level Display: Indicates the output signal level.
14. FAULT Indicator: Lights up if a protection circuit is activated.

Rear Panel Connections

The rear panel houses all input and output connections for the amplifier.

Figure 2: Rear Panel Layout. This image shows the back of the Omnitronic MP-120P, detailing the speaker output terminals (100V, 70V, 4-16 Ohm, COM), fuse holder, AC power input, and various RCA and 6.3mm jack inputs for microphones and line-level devices.

1. PRIORITY MIC INPUT: 6.3mm jack input for Microphone 3, with priority function.
2. MIC 2 INPUT: 6.3mm jack input for Microphone 2.
3. MIC 1 INPUT: 6.3mm jack input for Microphone 1.
4. LINE 1, LINE 2, LINE 3 INPUTS: Stereo RCA inputs for connecting external audio sources like CD players, tuners, etc.
5. LINE OUTPUT: Stereo RCA output for connecting to another amplifier or recording device.
6. SPEAKER OUTPUTS: Terminals for connecting PA speakers (100V, 70V) or low-impedance speakers (4-16 ohms). Connect the common (COM) terminal to the negative (-) terminal of your speakers.
7. FUSE Holder: Contains the main fuse for protection.
8. AC INPUT: Power cord connection.
9. GROUND Terminal: For connecting to an external ground if necessary.

Setup

Speaker Connections

Before connecting speakers, ensure the amplifier is turned off and unplugged from the power outlet.

• For 70V/100V PA Systems: Connect the positive (+) terminal of your 70V or 100V speakers to the corresponding 70V or 100V terminal on the amplifier. Connect the negative (-) terminal of your speakers to the COM terminal on the amplifier. Ensure the total wattage of all connected speakers does not exceed the amplifier's output power.
• For Low-Impedance Speakers (4-16 ohms): Connect the positive (+) terminal of your speaker(s) to the 4-16 Ohm terminal on the amplifier. Connect the negative (-) terminal of your speaker(s) to the COM terminal on the amplifier. Ensure the total impedance of connected speakers is within the 4-16 ohm range.
• Always use appropriate speaker cables with sufficient gauge for the distance and power.

Input Connections

• Microphones: Connect dynamic microphones to the MIC 1, MIC 2, or PRIORITY MIC (MIC 3) 6.3mm jack inputs on the rear panel.
• Line-Level Devices: Connect audio sources like CD players, tuners, or media players to the LINE 1, LINE 2, or LINE 3 RCA inputs on the rear panel.
• External Amplifier/Recorder: Use the LINE OUTPUT RCA jacks to send the mixed audio signal to another amplifier or a recording device.

Power Connection

1. Ensure all connections (speakers, inputs) are securely made.
2. Connect the supplied power cord to the AC INPUT on the rear panel of the amplifier.
3. Plug the other end of the power cord into a suitable mains power outlet (230V AC, 50Hz).

Operating Instructions

Powering On and Basic Operation

1. Before turning on, ensure all volume controls (MASTER, LINE, MIC) are set to their minimum position.
2. Press the POWER switch on the front panel to turn on the amplifier. The power indicator will light up.
3. Gradually increase the MASTER volume control to a desired listening level.
4. Adjust the TREBLE and BASS controls to fine-tune the tonal characteristics of the output sound.

Using Microphone Inputs

1. Connect your microphone(s) to the MIC 1, MIC 2, or MIC 3 inputs on the rear panel.
2. Slowly increase the corresponding MIC level control (MIC 1, MIC 2, or MIC 3) on the front panel until the desired microphone volume is achieved.
3. Priority Function (MIC 3): When a signal is detected on MIC 3, it will automatically attenuate the volume of other active inputs. The level of attenuation can usually be adjusted internally or via a dedicated control if available (refer to detailed product diagram or specific model features for adjustment).

Using Line Inputs

1. Connect your line-level audio source to the LINE 1, LINE 2, or LINE 3 RCA inputs.
2. Increase the corresponding LINE level control on the front panel to adjust the volume of the connected device.

MP3 Player Operation

1. Insert a USB flash drive into the USB port or an SD card into the SD CARD slot on the front panel. The MP3 player will typically detect the media automatically.
2. Use the MP3 player controls (Play/Pause, Next/Previous Track, Mode, Repeat) and the LCD display to navigate and play audio files.
3. Adjust the LINE/MP3 level control to set the volume of the MP3 player.
4. The included IR remote control can also be used for convenient operation of the MP3 player from a distance.

Chime Function

Press the CHIME button on the front panel to activate a pre-set chime sound, often used for announcements.

Maintenance

• Cleaning: Disconnect the unit from the power supply before cleaning. Use a soft, dry cloth to wipe the exterior surfaces. Do not use liquid cleaners or solvents.
• Ventilation: Ensure that the ventilation openings are not blocked. Periodically check for dust accumulation and gently clean with a soft brush or vacuum cleaner if necessary.
• Storage: If the unit is to be stored for an extended period, disconnect it from power, clean it, and store it in a cool, dry place away from direct sunlight and excessive moisture.
• Fuse Replacement: If the unit does not power on, check the fuse in the fuse holder on the rear panel. Replace it only with a fuse of the same type and rating (T2A/250V). Always unplug the unit before replacing the fuse.

Troubleshooting

Specifications

Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official Omnitronic website. Keep your proof of purchase for any warranty claims.