• Type: 1-channel (mono) Class AB amplifier
• Power (14.4V): 450W RMS @ 4Ω / 2Ω / 1Ω
  
• Minimum speaker load: 1Ω
  
• Input sensitivity: 7.5V – 1.5V
  
• Input impedance (1 kHz): 25 kΩ
  
• Frequency response (-3 dB): 4 Hz – 80 kHz
  
• THD: 0.04%
  
• Signal-to-noise ratio (rated power): 122 dB
  
• Signal-to-noise ratio (CEA-2006, 1W): 95.4 dBA
  
• Effective damping factor: >500
  
• Filter: No
  
• Fuse: 2 × 30A
  
• Protection: Thermal and short circuit
  
• Dimensions: 270 × 150 × 60 mm
  
• Weight: 2.3 kg
  
• Finish: Brushed Grey

• Low noise and distortion for a cleaner, more detailed sound.
• Stable power delivery in real-world vehicle conditions.
  
• Consistent output across 4Ω / 2Ω / 1Ω loads (rated 450W each).
  
• No built-in crossovers or bass boost — designed to run with an external DSP.
  
• High damping factor for tighter control of speakers (especially subwoofers).
  
• Compact, easy-to-place chassis with straightforward RCA + gain setup.
  
• Built-in protection for thermal and short-circuit faults.

• Sound-quality focused subwoofer systems where control and low-end accuracy matter
• DSP-tuned builds (because the amp has no onboard filter)
  
• Compact installs needing real output without a huge chassis footprint

When someone wants a mono amp that prioritises control and musical bass, Class AB still has a place and the 5A1 reads like it’s built with that mindset. The 1Ω stability, strong damping factor, and “no filter” design make it a good match for modern builds where the DSP handles the shaping and the amplifier just delivers clean power.