Audiophony MX44 4-Channel Mixer/Preamplifier

1 - Safety Information

Important Safety Information

This unit is intended for indoor use only. Avoid use in wet or extreme temperature locations. Failure to follow safety instructions may result in fire, electric shock, injury, or damage.

The product contains non-isolated electrical components. Do not perform maintenance while the unit is switched on to avoid electric shock. All maintenance must be performed by authorized CONTEST technical service. Basic cleaning should follow safety instructions.

WARNING: This unit contains no user-serviceable parts. Do not open the housing or attempt self-maintenance. Contact your nearest dealer for service. To prevent electrical malfunction, avoid using multi-sockets, power cord extensions, or connecting systems that are not perfectly isolated or may be defective.

Risk of Electrocution

To prevent electric shock hazards, ensure metal parts are out of reach when using extension cords, multi-sockets, or other connection systems.

Sound Levels

The audio solutions can deliver high sound pressure levels (SPL) that may be harmful with prolonged exposure. Avoid staying in close proximity to operating speakers.

Recycling Your Device

HITMUSIC is committed to environmental responsibility and offers ROHS compliant products. At the end of its life, take this product to a designated collection point. Proper recycling helps conserve natural resources and protects health and the environment.

Symbols Used

2 - Instructions and Recommendations

1. Read Carefully: Understand safety instructions before operating the unit.
2. Keep Manual: Retain this manual with the unit for future reference.
3. Operate Carefully: Consider all safety instructions during operation.
4. Follow Instructions: Adhere to all safety instructions to prevent harm or damage.
5. Avoid Water: Do not use the product in rain or near wet locations.
6. Installation: Use only manufacturer-recommended fixation systems or supports. Follow installation instructions carefully and use appropriate tools. Ensure the unit is firmly fixed to prevent vibration and slipping.
7. Ceiling or Wall Installation: Consult your local dealer before attempting ceiling or wall installation.
8. Ventilation: Cooling vents are crucial for safe operation and to prevent overheating. Do not obstruct or cover vents, as this can lead to overheating, injury, or product damage. Avoid operating in closed, non-ventilated areas unless adequate cooling is provided.
9. Heat Exposure: Keep the product away from heat sources like heaters or amplifiers to prevent overheating and damage.
10. Electric Power Supply: Operate the product only at the specified voltage, indicated on the rear label.
11. Power Cords Protection: Route power cords to prevent them from being walked on or pinched.
12. Cleaning Precautions: Unplug the product before cleaning. Use only manufacturer-recommended accessories. Clean surfaces with a damp cloth; do not wash the product.
13. Long Periods of Non-Use: Disconnect the unit's main power during extended periods of non-use.
14. Liquids or Objects Penetration: Prevent objects or liquids from entering the product to avoid electric shock or fire.
15. Servicing: Contact qualified service personnel if the power cord/plug is damaged, objects/liquids have fallen into the unit, the unit has been exposed to rain/water, it does not operate normally, or it has been damaged.
16. Inspection/Maintenance: Do not attempt self-inspection or maintenance. Refer all servicing to qualified personnel.
17. Operating Environment: Operate within an ambient temperature of +5 to +35°C and relative humidity less than 85% (with unobstructed vents). Avoid non-ventilated, very humid, or warm places.

3 - Introduction

The MIX44 mixer/preamp is designed for professional installation, offering 2 mic/line inputs and 2 stereo inputs. Each input can be independently routed to any of the 4 zones, providing maximum flexibility.

4 - Features

• 2 balanced Mic/Line inputs on Euroblock connectors.
• 2 stereo or mono inputs on Euroblock connectors.
• 4 balanced mono or stereo outputs on Euroblock connectors.
• Microphone priority function.
• Phantom power supply on inputs 1 and 2.
• Gain and 3-band tone adjustment on channels 1 and 2.
• Gain adjustment on all inputs.
• RJ45 connector for microphone control panel.
• Mute contact for outputs 1 to 4.
• Zone assignment (1 to 4) for each input channel.
• Signal and Peak display for each input channel.
• Output level display per zone via 3 LEDs (Vu meter).

5 - Technical Data

6 - Presentation

Front Panel

The front panel features controls for input level setting, output channel selection, output level adjustment, and output LED indicators.

• 1. Input Level Setting: Adjusts levels for inputs 1 to 4, which can accept line or microphone sources. These inputs are mono.
• 2. Output Channel Selectors: Assign each input channel to one or more outputs.
• 3. Output Level Adjustment: Controls the output level for zones 1 to 4.
• 4. Output LED Indicators:
  • SIG: Indicates the presence of an output signal.
  • -10dB: Indicates a minimum output signal level.
  • CLIP: Indicates an excessively high output level. Brief flashes are recommended to prevent distortion.
• 5. Output Equalization:
  • HIGH: Adjusts treble frequencies (+/-15 dB at 12 kHz).
  • LOW: Adjusts bass frequencies (+/-15 dB at 100 Hz).
• 6. Power Switch: Turns the unit on and off. The power LED indicates when the unit is on.

7 - Rear Panel

• 1. Power Input: Connect the supplied IEC power cord here. Verify voltage before connecting to an outlet.
• 2. DC24V Connector: For a 24V back-up power supply, enabling use as an emergency alert center.
• 3. PRIORITY INPUT: This input mutes all other inputs when active.
• 4. REMOTE MIC: Connects to the MIC-DESK4 announcer for individual zone selection for public announcements.
• 5. Outputs STEREO/MONO Switches: Sum stereo inputs to two identical channels.
• 6. EXT. MUTE Connectors: Connect a contact to mute corresponding outputs.
• 7. Line Outputs: Connect amplifiers to power speakers. Signal levels are adjustable via front panel potentiometers.
• 8. 3 and 4 Input Connectors: Stereo line level inputs with adjustable volume via the front panel.
• 9. GAIN Potentiometer: Adjusts the incoming signal level for each input.
• 10. STEREO/MONO Inputs Switches: Route a mono input signal to both right and left output channels.
• 11. 1 and 2 Input Connectors: Connect line or microphone level signals.
• 12. PHANTOM Switches: Provide +15 V DC phantom power to microphone channels 1 and 2 for condenser microphones.
• 13. TALKOVER Switches: Attenuate line level signals when a signal is present on inputs 1 and 2.
• 14. 1 and 2 Channels Equalization: 3-way equalization (LOW, MID, HIGH) for microphone channels, adjustable from -15 to +15 dB at specific frequencies (LOW: 80 Hz, MID: 2.5 kHz, HIGH: 12 kHz).
• 15. MIC/LINE Switches for Inputs 1 and 2: Select the input level (line or microphone) for channels 1 and 2.

8 - Schematic Diagram of the Principle

The diagram illustrates the system configuration, including the MIC-DESK4 for announcements, a Webradio, a Multimedia player, the MX44 mixer/preamplifier, microphones, an amplifier (AMP480), and 100V line-level speakers.

System Connections:

• MIC-DESK4 connects to the MX44 for zone announcements.
• Webradio and Multimedia player connect to the MX44 inputs.
• Microphones connect to CH 1 / MIC and CH 2 / MIC inputs.
• MX44 outputs connect to an amplifier (e.g., AMP480).
• The amplifier powers speakers.