I owned an XP20, XP10, Aesthetix Calypso, Aesthetix Janus, Pass Labs X250, X350, XA100.5's, and have Rogue M180's due to arrive Friday. I can tell you that the XP series is more forward and detailed but the Aesthetix has a more realistic sound. I personally sold the Pass XP's due to the Aeshetix sounding better to me. If you are looking for mirco detail the XP is the route you want to go. The XP10 vs the XP20 is in the weight of the instruments and the bass power. The XP20 is obviously the better of the 2 but the 10 has the same house sound. The Calypso and Janus sound very similar but the janus has a little more noise and runs a little hotter due to the extra tubes etx in the Janus. The X250 sounded good, X350 was a little more forward but more powerful, the XA100.5's sound excellent but a hair bass shy in comparison to some other amps. I will be doing a direct AB of the Rogue and XA100.5's Friday so we shall see.
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