Pass Labs X350.8 Stereo AmplifierAt 350 watts per channel Class A B, the X350. 8 is the largest and most powerful stereo power amplifier of Pass Labs line up. Because Pass Labs care more about how holistic design affects the musical experience and relatively less about how parts affect specifications, you can expect superb and accurate representation of the recording performance and venue, as well as the distinctive layering of instruments captured faithfully.