Kmccarty, there's a pretty strong consistency, among Nelson Pass fans, that in the X-series the 250 was the best single chassis amp sonicly and the 600 mono-blocks was the best sounding of all the X-series amps. However, their were certain fans of Mr. Pass's, including myself, that found the X-series lacking the "warmth/musicality" of the older Aleph amps. This has been totally corrected in the new XA and X-.5 series amps, they offer the "dynamics/speed/drive" of the X-series with the "warmth/liquidity/musicality" of the older Aleph series. Remember, if price is not a consideration, that the XA amps do not double down into lower resistence but the X-.5 amps do, therefore one factor of which amp to use either a XA or X-.5 would be on what type of speaker you are driving. For example, I drive MG-20r's so I use a 350.5 which was a better match than a XA-100's in my system. If your lucky enough to be able to purchase either a pair of XA-160's or X-600.5's you are in for a great treat either way. Hope this helps.
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