• Type: 4-channel Class AB High Bias Amplifier
  
• Power @ 4Ω stereo (14.4V): 75W x 4
  
• Power @ 2Ω stereo (14.4V): 125W x 4
  
• Power @ 4Ω bridged (14.4V): 210W x 2
  
• Minimum speaker load: 2Ω
  
• Input sensitivity: 5V – 350mV
  
• Input impedance (1kHz): 20 kΩ
  
• Frequency response (-3 dB): 7 Hz – 40 kHz
  
• THD (1W, 20Hz–20kHz): 0.08%
  
• SNR (rated power): 108 dB
  
• SNR (CEA-2006, 1W): 89.5 dB
  
• Channel separation (rated power): 58 dB
  
• Damping factor (20Hz–20kHz): >150
  
• Active crossover: No
  
• Fuse: No
  
• Protection: Thermal and short circuit
  
• Dimensions: 270 x 150 x 60 mm
  
• Weight: 2.1 kg
  
• Finish: Brushed Grey

• Signal-pure circuit design that keeps the background quiet so fine detail comes through.
• High-bias Class AB sound for smoother, more natural playback with less crossover distortion.
  
• DSP-first “pure amp” approach so your tuning stays clean and uncompromised.
  
• Compact but serious performance with pro-grade internals and robust heatsinking.
  
• Keeps resolution at low volume so clarity doesn’t disappear when you’re not cranking it.
  
• Premium component selection focused on accuracy and musical control, not gimmicks.

• DSP-based systems needing a clean, no-frills 4-channel amp
  
• SQ-focused front stages (active or passive) where smooth Class AB delivery matters
  
• 2-way / 3-way front + rear fill, or front stage + bridged sub style builds (depending on system plan)
  

The 5A4 is the kind of amp that makes sense when you’re already committing to DSP tuning and you want amplification that stays neutral and predictable. The bridged option gives you flexibility for a front stage plus sub, and the High Bias Class AB approach is exactly what many SQ-focused systems still lean on for smoothness and control.