1. Introduction
Welcome to the user manual for the BST 95-1544 UPX4120 Mixer Amplifier Matrix. This professional audio device integrates a 5-way mixer, a 4-zone matrix, and a powerful 4-channel amplifier, delivering 4x120W output. It also includes an integrated MP3 player with support for SD cards and USB drives up to 32GB. This manual provides essential information for the safe installation, operation, and maintenance of your unit, ensuring optimal performance and longevity.
2. Safety Instructions
Please read and understand all safety instructions before operating this device. Retain this manual for future reference.
- Power Supply: Connect the unit only to an AC power source within the specified voltage range (220V-240V, 50Hz). Ensure the power cable is not damaged or pinched.
- Ventilation: Ensure adequate ventilation around the unit. Do not block ventilation openings. Avoid installing the unit in enclosed spaces or near heat sources.
- Moisture: Do not expose the unit to rain, moisture, or excessive humidity. Do not place objects filled with liquids on or near the unit.
- Servicing: Refer all servicing to qualified service personnel. Do not attempt to open or repair the unit yourself, as this may void the warranty and pose a safety risk.
- Placement: Install the unit on a stable, level surface or in a standard 19-inch equipment rack. Avoid placing it where it could be subject to strong vibrations or impacts.
- Cleaning: Disconnect the power before cleaning. Use a dry, soft cloth. Do not use liquid cleaners or aerosols.
3. Package Contents
Verify that all items are present upon unpacking:
- BST 95-1544 UPX4120 Mixer Amplifier Matrix Unit
- Power Cable
- User Manual (this document)
4. Product Overview
4.1 Front Panel
Image 1: Front panel of the BST 95-1544 UPX4120 Mixer Amplifier Matrix, showing input controls, tone adjustments, master volume, output level indicators, and power switch.
- Input Level Indicators: LED meters displaying the input signal level.
- Headphone Output: 6.35mm jack for monitoring audio.
- Input 1-5 Volume Controls: Rotary knobs to adjust the volume for each of the five input channels.
- Bass Control: Adjusts the low-frequency response.
- Treble Control: Adjusts the high-frequency response.
- Master Volume: Controls the overall output volume.
- Output Current Indicators: LEDs showing the output level for each amplifier channel/zone.
- Power Switch: Toggles the unit's power ON/OFF.
4.2 Rear Panel
Image 2: Rear panel of the BST 95-1544 UPX4120 Mixer Amplifier Matrix, displaying various input/output terminals, zone outputs, and control ports.
- Monitor Output: Audio output for external monitoring.
- Tel Paging Input: Priority input for telephone or paging systems.
- Line Out (Zones 1-4): Unamplified line-level outputs for each zone.
- Speaker Outputs (Zones 1-4): Terminals for connecting speakers to each of the four amplifier zones.
- Phantom Power Switches: Enable/disable phantom power for specific microphone inputs.
- USB Port: For connecting USB storage devices for MP3 playback.
- RS232 Port: For external control and integration with control systems.
- Remote Mic Input: Connection for a remote microphone.
- AC Power Input: Connector for the main power cable.
5. Setup
5.1 Rack Mounting
The BST 95-1544 is designed to be rack-mounted in a standard 19-inch equipment rack. Secure the unit using appropriate rack screws to ensure stability.
5.2 Power Connection
Connect the supplied power cable to the AC Power Input on the rear panel and then to a suitable electrical outlet. Ensure the power switch on the front panel is in the OFF position before connecting to power.
5.3 Audio Input Connections
- Microphones: Connect microphones to the XLR or 1/4" TRS inputs on the rear panel. If using condenser microphones, activate phantom power using the corresponding switches.
- Line-Level Devices: Connect CD players, media players, or other line-level audio sources to the RCA or 1/4" TRS line inputs.
- MP3 Player: Insert an SD card into the dedicated slot or a USB drive into the USB port for direct audio playback.
- Tel Paging: Connect a telephone or paging system to the dedicated priority input for emergency announcements or general paging.
5.4 Audio Output Connections
- Speakers: Connect your speakers to the screw terminals for each of the four zones (ZONE 1-4) on the rear panel. Ensure correct polarity (+ to + and - to -) and impedance matching.
- Line Out: Use the Line Out connections for each zone to send an unamplified signal to external amplifiers or recording devices.
- Monitor: Connect a monitor speaker or headphones to the Monitor output for local audio monitoring.
6. Operation
6.1 Powering On/Off
To power on the unit, ensure all connections are secure, then flip the Power Switch on the front panel to the 'ON' position. The Power LED will illuminate. To power off, flip the switch to 'OFF'.
6.2 Basic Mixing
Adjust the individual Input Volume Controls (1-5) for each connected audio source. Use the Bass and Treble controls to fine-tune the overall tone. The Master Volume control adjusts the final output level for all zones simultaneously.
6.3 Zone Selection and Output
The unit features a 4-zone matrix. On the front panel, use the selectors to route any input to any of the four output zones. Each zone has independent output level control and can receive a different mix of inputs.
6.4 MP3 Player Operation
Insert an SD card or USB drive containing MP3 audio files into the respective slot/port. The integrated MP3 player will automatically detect the media. Use the dedicated controls (Play/Pause, Next/Previous, Mode) to navigate and play audio files. Refer to the MP3 player section of the full manual for detailed instructions.
6.5 Priority Function
The Tel Paging input on the rear panel has a priority function. When an audio signal is detected on this input, it will automatically override other active audio sources, allowing for clear announcements or emergency messages across all selected zones.
7. Maintenance
- Cleaning: Regularly clean the exterior of the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure ventilation grilles are free from dust and debris.
- Ventilation: Periodically check that the ventilation openings are not obstructed to prevent overheating.
- Storage: If storing the unit for an extended period, disconnect it from power, clean it, and store it in a dry, dust-free environment.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on. | Power cable not connected; power outlet faulty; unit fuse blown. | Check power cable connection; test power outlet; consult qualified technician for fuse replacement. |
| No sound output. | Input/output cables incorrect; volume controls too low; incorrect zone selection; speakers not connected. | Verify all audio connections; increase input, master, and zone volumes; ensure correct zones are selected; check speaker connections. |
| Distorted sound. | Input signal too high (clipping); speaker impedance mismatch; faulty cables. | Reduce input volume; ensure speaker impedance matches amplifier; replace faulty cables. |
| MP3 player not working. | SD card/USB drive not inserted correctly; unsupported file format; corrupted media. | Reinsert media; ensure files are MP3 format; try a different SD card/USB drive. |
9. Specifications
- Model Number: 95-1544
- Brand: BST
- Type: Mixer Amplifier Matrix
- Channels: 4 (Amplifier), 5 (Mixer Inputs)
- Power Output: 4 x 120W
- Bandwidth: 80Hz - 16kHz
- Connectivity: USB (for MP3 player)
- Power Source: Electric Cable (AC 220-240V, 50Hz)
- Rackable: 19 inches
- Weight: Approximately 19 Kilograms
- Manufacturer: Lotronic
10. Warranty and Support
For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your proof of purchase for any warranty claims. For further assistance, you may also contact the manufacturer, Lotronic, directly.
