pass labs xa100.5 or pilinius sa 103

Had pass x250.5 with contour s 3.4's. Also had plinius sa 102 ( extremely similar to sa103). To my ears pass/dynaudio far better. Plinius/dun combo had noticable coloration treble region which caused the soundstage to appear compressed. Did not like plinius at all. Pass sounded more like music. Also ran plinius on s 5.4 which are same tweeters as C 4. Got the same result. Could not stand it, but that's just me. Ymmv

"..pass labs xa100.5 to replace my plinius sa 103"

Why would you replace one amp with another, almost identical power capabilities and sonic signature?

Both are excelllent. I owned Plinius SA-102 but it did not have enough power for my speakers so I bought Spectron... this why I am puzzled...

This is easy. You already have the Plinius. Just borrow the Pass from the dealer and decided which sounds better in your system. I haven't heard the Plinius, but I did own the XA100.5. It is fantastic.

Spectron? One of my friends has $3900 Spectron and it is very powerful and sound decent but it ain't no high quality class A or AB amp and it for sure does not sound as good as my Pass Labs x350.5. It sounds impressive at first but when go back to the x350.5 you then understand what was missing on the Spectron.

Don't know about the Pass x350.5 but I would take Spectron (with the upgrades) over the XA100.5 (I own both), but again, it's subjective, all amps mentioned int his thread are very good.