The Bas X A4 is a four channel power amplifier that delivers 100 watts / channel into 8 Ohms & 130 watts / channel into 4 Ohms all channels driven with a rated THD+N of < 0.02% & an A-weighted S/N ratio of 115 d B. The Bas X A4 features a heavy-duty linear power supply high-quality Class A/B amplification transparent fault protection & a trigger input & output. High quality industry standard unbalanced RCA inputs enable the Bas X A4 to be used with almost any preamp or processor & audiophile grade five way speaker terminals accept banana plugs spade lugs or bare wire. These features combine to enable the Bas X A4 to deliver true audiophile performance & sound quality at an amazingly affordable price. The Bas X A4 is the perfect solution if you need a high quality amp to power your Dolby Atmos & DTS:X height channels. It is also an excellent choice to power your surrounds if youre building a new system & youve already committed to a more powerful amp like our XPA-3 to power your front channels or to power two pairs of zone speakers.