I think the Pass is basically their X-150 amp with a passive pre, I don't think there should be any complexity or compromise that might occur when building a pre into an amps chassis. Pass certainly knows how to build amps, adding as passive attentuator (perfectly matched to the amp portion) should make for a great integrated, assuming you like the sound of a Pass amp, I do. I've not heard the integrated, but I would be shocked if it was a mighty good one. Not bad looking either IMHO.