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The  ALF-PA100V Power Amplifier is a 40 Watt Power Amplifier (Class-D) with output alternatively at 70V or 100V. It has two stereo inputs (1 × 3.5mm jack for line-in, 2 x RCA for L&R), 1 x digital input and 1 x balanced MIC. It is integrated with powerful functions, including ducking functionality, EQ control, MIC mixer, and the MIC input supports three levels with condenser MIC, dynamic MIC and line audio input.

As for power amplifiers, we normally have voltages at 70V and 100V for different countries, but the ALF-PA100V is designed to integrate with both voltages to meet different requirements.

Product Features

  • Mono audio output at 40 Watts
  • Switchable between 70V and 100V
  • Ducking function
  • 16 ID codes for controlling between different PA100V amplifiers
  • 3-level MIC input, supports condenser microphone, dynamic microphone, and wireless microphone
  • MIC port can support balanced / unbalanced signals, suppressing the external noise effectively
  • Two stereo audio inputs and one digital audio input, switchable via panel button, IR remote, and RS232
  • Volume / Bass / Treble controllable via panel buttons, IR remote, and RS232
  • Fast switching speed for good performance.
  • Convection cooled, a fan is not needed
  • LED indicator, for power and working status
  • Antistatic case design to provide adequate protection for long-term and stable performance


Audio Input  Audio Output 


2 stereo audio 

1 MIC 

1 Digital fiber audio 




1 mono amplifier 



Input Connector 

2 RCA 

1 3.5mm jack 

1 3-pole 3.81mm captive screw connector 

1 SPF fiber connector 



Output Connector 


1 3-pole 3.81mm captive screw connector 

Input Impedance  >10KΩ  Output Type  Constant voltage 70V or 100V. 
Audio General 
Frequency Response  120Hz ~ 20KHz  CMRR  >70dB@20Hz~20KHz 
SNR  80dB (Max)  Bandwidth  120Hz ~ 20KHz 
Rated Power Output   



THD + Noise 


0.3%@20KHz at nominal level 

Voltage Gain  26dB 
Control Function 
 RS232 Control  1 3-pole 3.81mm captive screw connector Front Panel Control buttons  
ID Code Control  16 ID codes for control. 
Optional  IR remote
Temperature  -10 ~ +40  Humidity  10% ~ 90% 
Power Supply  DC 24V power adapter  Standby Power Consumption   




W130 x H44 x 

D144mm (1U high) 






Technical Sheet

User Manual


1. Q – How many inputs does the PA100V support?

A – 3. 1 x RCA, 1 x 3.5mm jack, a phoenix connected for microphone and optical.

2. Q – Can I use this amplifier with a low impedance system?

A – No, the amplifier is a 70v / 100v amplifier. Please see our PA100W amplifier.

3. Q – What is the output of the amplifier?

A – 40 watts.

4. Q – How do I control the amplifier?

A – It is controllable via IR remote control, RS232 and front panel buttons.

5. Q – Is the microphone input balanced?

A – Yes, the microphone can be wired in as balanced or unbalanced.