Kmccarty, my hunch, since I never had the pleasure to audtion them against each other, is that the XA amps are somewhat "warmer/richer" sounding then the X.5 amps. All the X.5 amps sound closer to the XA series then the first generation X series amps. Remember, we are talking about a very similar sonic signature, just degrees of difference between the XA and X.5 series. So, if the price difference is irelevant, I believe it would come down to personnal taste and system matching for the best synergy. In my system the X-350.5 was a better match then the XA-100's. If you want post the rest of your system and I will give you feedback about what might be a better match. Either way you go you can't lose their all great sounding amps!
Pass Labs Amplifiers - XA160 versus X600
Has anyone ever compared these amplifiers' sound quality? I ran across this review on the Pass Labs website http://www.passlabs.com/downloads/poltun-xa160-x600.pdf. I found this to be a compelling review - especially given that this guy intimately knows the sound of one of the greatest orchestras in the world - the Vienna Philharmonic. So compelling in fact that I am tempted to run out and buy the very system he uses...Any comments on the sound of these amps?
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