The BasX A4 combines classical audiophile amplifier architecture, based on a heavy-duty linear power supply, and a carefully designed high current short signal path Class A/B output stage, with advanced microprocessor-controlled monitoring and protection circuitry, to deliver superb sound quality at a truly reasonable price.
The BasX A4 is the perfect solution if you need a high-quality amp to power your Dolby Atmos and DTS:X height channels. It is also an excellent choice to power your surrounds if you’re building a new system and you’ve already committed to a more powerful amp, like our XPA-3, to power your front channels or to power two pairs of zone speakers.


  • Four-channel power amplifier
  • 100 watts / channel into 8 Ohms all channels driven
  • 130 watts / channel into 4 Ohms all channels driven
  • THD+N < 0.02%
  • A-weighted S/N ratio: 115 dB
  • Transparent fault protection
  • Trigger input and output
  • Auto signal detect
  • High quality industry standard unbalanced RCA inputs