The VL120004 is a compact-sized Class-D digital amplifier designed for various audio applications, including classrooms, small meeting rooms, lecture halls, bars, and pubs. It offers a range of powerful functions, including bridge connection, dual-mono output, EQ control, and a microphone mixer.
Function Description:
The VL120004 serves as an audio amplifier with three inputs: two stereo line inputs and one balanced microphone input. It amplifies audio signals for output to speakers. The device supports both stereo (2x20W@4Ω) and bridged mono (1x40W@8Ω) output configurations. It also features a dual-mono function, which sums stereo audio into two mono audio outputs. The integrated microphone mixer allows for mixing microphone audio with line audio, with separate control for the microphone. An automatic noise gate mutes the output when no audio or microphone input is detected, ensuring a clean audio experience.
Important Technical Specifications:
- Input: 2 stereo audio inputs, 1 MIC input.
- Input Connector: 2 RCA, 1 x 3.5mm jack, 1 pluggable terminal block (3P, 3.81mm).
- Input Impedance: >10KΩ.
Audio Output:
- Output: 1 amplifier, 1 stereo audio output.
- Output Connector: 1 x 3.5mm jack, 1 pluggable terminal block (4P, 5.08mm).
- Output Impedance: 50Ω/stereo, 4~8Ω/Amplifier.
- Power Output: 2x20 Watts (4 Ohms) as default. Can be configured to 1x40 Watts (8 Ohms) in bridge connection.
Audio General:
- Frequency Response: 20Hz ~ 20KHz.
- SNR (Signal-to-Noise Ratio): 80dB at maximum output.
- CMRR (Common-Mode Rejection Ratio): >70dB@20Hz~20KHz.
- Bandwidth: 20Hz~25KHz.
- Stereo Channel Separation: >75dB@20Hz to 20KHz.
- THD + Noise (Total Harmonic Distortion + Noise): 1%@1KHz, 0.3%@20KHz at nominal level.
- Voltage Gain: 32dB.
Control Function:
- RS232 Control: 3-hole phoenix connector.
- Panel Control: Optional button control.
- IR Remote: Optional IR remote.
Physical Dimensions:
- Width: 123.00 mm
- Height: 87.00 mm (front panel), 57.00 mm (rear panel)
- Depth: 99.00 mm (main body), 12.00 mm (connectors)
Usage Features:
- Flexible Output Configurations: Default 2x20Watt@4Ohm stereo output. Can be switched to 1x40Watt@8Ohm bridge connection for higher power mono output.
- Dual-Mono Function: Sums stereo audio into two mono audio outputs, providing flexibility for different speaker setups.
- Multiple Audio Inputs: Two stereo audio inputs (RCA and 3.5mm jack) are switchable via buttons, IR remote, or RS232.
- Comprehensive Audio Control: Volume, Bass, and Treble are controllable via front panel buttons, IR remote, and RS232.
- Advanced Microphone Input:
- Supports balanced/unbalanced signals, effectively suppressing external noise.
- MIC input supports 48V phantom power for condenser microphones, dynamic microphones, and wireless microphones.
- MIC mixer function allows microphone audio to be mixed with line audio output and controlled separately.
- Three microphone input modes: 48V phantom power, MIC (for dynamic mics), and LINE (for normal audio or wireless mic output).
- Line Audio Output: A 3.5mm jack provides line audio output with controllable volume.
- Automatic Noise Gate: Automatically mutes the output when no audio or MIC input is detected, ensuring silence during pauses.
- Ultra-Low Inrush Current: Eliminates the need for power sequencing, allowing multiple VL120004 units to be powered on simultaneously without overloading power circuits.
- Convection Cooling: Fanless design ensures silent operation.
- Antistatic Case Design: Provides robust protection for long-term and stable performance.
- Control Panel Operation: Front panel buttons allow for input selection (INPUT SEL), MIC/LINE volume selection, BASS/TREBLE adjustment, and MUTE control.
- IR Remote Control: An optional IR remote (offered separately) provides convenient control over input selection, volume (MIC, LINE), EQ (BASS, TREBLE), and mute functions. An IR receiver head (also offered separately) connects to the amplifier via a 3.5mm jack.
- RS232 Communication: Allows for external control and status checking via RS232 commands, enabling integration into larger control systems. Commands include switching inputs, muting, adjusting volumes (MIC, LINE), bass, treble, and toggling the noise gate.
Maintenance Features:
- Troubleshooting Guide: The manual provides a detailed troubleshooting section for common issues:
- No Output Audio: Check input/output signals with an oscilloscope or multimeter, inspect cables and connectors, and verify output port number matches the controlled one. If issues persist, unit may require repair.
- Power Indicator Not Working/No Response: Ensure power cord connection is secure.
- Interfered Output Sound: Verify proper system grounding.
- Stronger Static with Audio Connectors: Indicates poor grounding; check grounding connections to prevent damage.
- Control Panel/RS232/IR Remote Unresponsive: Suggests a unit malfunction, requiring repair by a dealer.
- Safety Precautions: Emphasizes careful unpacking, following basic safety rules (fire, electrical shock), avoiding dismantling or modification, using specified parts, referring servicing to qualified personnel, protecting from rain/moisture, avoiding heavy items on cables, ensuring good ventilation, keeping away from liquids, handling optical cables carefully, unplugging when not in use, and proper disposal of electrical waste.
- Product Limited Warranty: Three-year warranty on materials and workmanship from the purchase date, requiring proof of purchase (invoice).
- Warranty Exclusions: Does not cover warranty expiration, altered serial numbers, damage from normal wear and tear, non-specified parts, lack of proof of warranty, mismatched product models, force majeure, unauthorized servicing, or issues unrelated to product defects. Delivery, installation, or labor charges are also not covered.
- Technical Support: Users can contact the after-sales department via email or phone, providing product version, name, detailed failure situations, and case formation for assistance.
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