I just bought a pair of the XA100.5, replacing the XA160. My speakers are 87db with a 4-6ohm load like yours. I have never heard the Lamm products. The XA sounds better and more powerful than the XA160 as it doubles in power as impedence is halved. You can read my review of Pass Class A amps on Audiogon for more details/impressions. I have found that one cannot feed my Egglestons too much power and I'm sure they would benefit from more, but the 100.5s are the biggest Pass Class A amps that I can afford. They do sound glorious. I don't really care about the cache part.
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