Matt4551,
As one who has owned the Pass X250.5 as well as the MC 402, and 3 other Mac amps, I would strongly advise you to hear both in your system before purchase. The Pass was thin and electronic sounding in comparison to the Mac 402. Of course, that is to my ears and my taste, but the difference was plain enough to advise caution. Both companies offer great customer service though.
As one who has owned the Pass X250.5 as well as the MC 402, and 3 other Mac amps, I would strongly advise you to hear both in your system before purchase. The Pass was thin and electronic sounding in comparison to the Mac 402. Of course, that is to my ears and my taste, but the difference was plain enough to advise caution. Both companies offer great customer service though.