The Pass Labs X250.8 stereo class A/B model represents a step up in power and performance from the X150.8 and, like all of our products, has been painstakingly designed, tweaked, redesigned, and fine-tuned to deliver maximum musical enjoyment. This hard work and creativity result in a greater “look-back” at the original musical performance, conveying additional insight into the artist’s creative intent. Isn't that what it's all about?