>>05-10-10: Keithr
as an aside, I have heard the Pass X-30.5 isn't a perfect power match with Definitions as well. perhaps it's related.<<
Very interesting.
First of all, the XA30.5 is a very powerful amplifier. I don't believe you can clip it with a pair of Definitions.
Second, I ran a pair of Definitions with the XA30.5, among other amplifiers, and found the match to be sublime. It actually outperformed a handful of tube amplifiers to my ears.
As always YMMV
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