Stereo amp with integrated Adaptive Voltage Switching Power Supply for explosive power and ultra-low distortion.
Peak Power: 300W@4ohm, 180W@8ohm.
RMS power: 260W@4ohm, 150W@8ohm.
Heatsink, mounting bracket, RCA inputs, and cables included.


The NPX-280ASP has advanced protection circuitry that safeguards it from fault conditions such as short circuits, overload, over temperature, and under-voltage.

The amplifier’s output signal feeds back into the Adaptive Voltage Switching Power Supply’s servo power stage, causing a change in the output voltages supplying the power stage of the amplifier. This design resulted in more details at a low music level and explosive power at a high volume.


  • Power output (peak) @ 4 Ohm: 280W
  • Power output (peak) @ 8 Ohm: 170W
  • Power output (RMS rated) @ 4 Ohm: 220W
  • Power output (RMS rated) @ 8 Ohm: 120W
  • Input impedance: 47k Ohm
  • Minimum load impedance: 3.4 Ohm
  • Maximum total Amp+PSU efficiency: 80%
  • Gain 20
  • Peak output current: 17A
  • Dynamic range: 130dB
  • Sensitivity (to rated power): 1.9 Vrms
  • Output referenced idle noise (A-weighted): 50uV
  • Frequency response: 10Hz to 50kHz
  • THD+N @ 5W/1kHz: 0.0046
  • THD+N @ 50W/1kHz: 0.015
  • THD+N @ 100W/1kHz: 0.02
  • Supply voltage input (non selectable): 100~120 VAC or 220~240 VAC