(Please refer to documents for advanced specifications.)

• Amplifier class: Class D
• Channels: 4
  
• Power @ 4 Ω stereo (14.4 V): 60 W per channel
  
• Power @ 2 Ω stereo (14.4 V): 90 W per channel
  
• Power @ 4 Ω bridged (14.4 V): 180 W per channel
  
• Minimum speaker load: 2 Ω
  
• Input sensitivity: 6 V to 150 mV
  
• Frequency response (-3 dB): 10 Hz – 20 kHz
  
• THD (1 W, 20 Hz – 20 kHz): 0.1%
  
• Signal-to-noise ratio (rated power): 90 dB
  
• Signal-to-noise ratio (CEA-2006, 1 W): 73.2 dB
  
• Channel separation (rated power): 46 dB
  
• Damping factor (20 Hz – 20 kHz): >92
  
• Active crossover: No
  
• Fuse: 2 × 20 A
  
• Weight: 1.15 kg
  
• Dimensions: 182 mm × 105 mm × 41 mm
  
• Finish: Brushed Black

• Compact Class D design intended for space-limited installs without giving up a full-range output stage.
• Runs full-range with no built-in crossovers, suited to systems tuned via DSP or head unit.
  
• Stable to 2 Ω stereo with bridging support for higher output into 4 Ω loads.
  
• Aluminium heatsink chassis for thermal stability and consistent operation in tight mounting locations.
  
• Low-level RCA input only for clean integration with aftermarket sources or DSP.

• Modern vehicles with limited mounting space (under-seat, behind-trim, compact cavities)
• Front + rear speaker systems needing a small, efficient 4-channel amplifier
  
• DSP-based builds where crossovers and tuning are handled upstream
  
• Installations requiring 2 Ω stereo stability or bridged power into 4 Ω loads

When space is the constraint, the 1A4 is the kind of amplifier that lets you keep the system layout sensible instead of forcing compromises. It’s genuinely small, it’s stable down to 2 Ω, and it’s designed to run full-range without onboard crossovers getting in the way, so you can handle filtering properly upstream with a DSP or a capable head unit. In a market full of compact amps that lean hard into features, this one stays focused on fitting where others won’t and doing the basics consistently.