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The PA2B is a compact-sized digital amplifier (Class-D) with 3 inputs (2 lines in and 1 balanced MIC). It is integrated with powerful functions, including bridge connection, dual-mono, EQ control, microphone mixer etc.
It has a good application in different places, including classroom, small meeting room, lecture hall, bar, pub etc.


2 x 20 Watt@40hm as the default amplifier output.

Bridge connection function. User can switch the PA2B to be 1 x 40Watt@80hm by bridge connection.

Two stereo audio inputs, switchable by button, IR remote & RS232.

Volume /Base/Treble controllable by buttons IR remote & RS232.

MIC port can support balance/unbalance signal, suppress the external noise effectively.

Line audio output at 3.5mm jack, with volume controllable.

Dual-mono up the stereo audio to two times mono audio.

MIC mixer function. The microphone will be mixed to the line audio output, and be controlled separately.

MIC input supports 48V phantom power, dynamic MIC and Wireless MIC.

Auto noise gate. It keeps detecting the audio and MIC input, will mute the output when there is no input.

Ultra low inrush current, no need for power sequencing and this allows multiple PA2B to be powered on simultaneously without overloading power circuits.

Convection cooled, the fan is not needed.

Anti-static case design: providing good protection for long-term and stable performance.

Additional information

Dimensions 8.7 × 12.3 × 4 cm


Audio Input  Audio Output 
Input  2 stereo audio, 1 MIC  Output  1 amplifier, 1 stereo audio 
 Input Connector  2 RCA 1 3.5mm jack 

1 pluggable terminal block (3P,3.81mm), 

 Output Connector  1 3.5mm jack 1 pluggable terminal block (4P, 5.08mm) 
Input Impedance  >10KΩ  Output Impedance  50Ω/stereo, 4~8Ω/Amplifier 
Audio General 
Frequency Response  20Hz ~ 20KHz  CMRR  >70dB@20Hz~20KH z 
SNR  80dB at maximum output  Bandwidth  20Hz ~ 25KHz 
Stereo Channel Separation  >75dB@20Hz to 20KHz   THD + Noise  1%@1KHz, 0.3%@20KHz 

at nominal level 

Voltage Gain  32dB  Power Output  2×20 Watts (4 Ohms) 
Control Function 
RS232 Control  3-hole phoenix connector  Panel Control  Optional button control 
IR Remote  Optional IR remote 


User Manual