The Bas X A3 is a three channel power amplifier that delivers 140 watts / channel into 8 Ohms & 200 watts / channel into 4 Ohms all channels driven with a rated THD+N of < 0.02% & an A-weighted S/N ratio of 112 d B. The Bas X A3 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 A3 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 A3 to deliver true audiophile performance & sound quality at an amazingly affordable price. The Bas X A3 is the ideal choice to power a 3.1 channel system to upgrade the front three channels of a surround sound receiver or for anywhere where three channels of great sounding clean power are needed