Pass Labs X250.8 Stereo AmplifierThis stereo Class A B model represents a step up in power and performance from the X150. 8 and, like all of Pass Labs products, has been painstakingly designed, tweaked, redesigned and fine tuned to deliver maximum musical enjoyment. This hard work and creativity results in a greater look back at the original musical performance, conveying additional insight to the artists creative intent. Isn't that what it's all about?