I am wondering why everybody is so hype about the pass amps. I have owned the Halcros a few years back, and I found them to be very god sounding. I have never owned the XA 200.5 but I have a set of 100.5 along with a set of MSB M202 in my listening room right now, and the MSB´s blow the Pass monos away. The Pass´s ar very good indeed, but if you like neutrality and detail, there are better options out there.