BAT VK-600 vs Pass XA100.5

Tvad, when I compare these two amps, input inpedance had nothing to do with it.

My main SS preamp is an H20 Fire, which has no problem driving the Pass.

My other SS preamp is a Parasound JC-2. I've used many other preamps with the Pass as well, including the Pass XP-20.

When I say 'rolled-off', I mean in comparison to other amps, i.e. the Pass is slightly darker sounding than my Bat, or other amps that I've owned (Theta Citadel 1.5 comes to mind). This is with solid state preamps, NOT tubes.

Yes, I tried a couple tube amps that were not good matches with the Pass (Ref 3, Audio Valve Eklipse), but that hardly means EVERY preamplifier I've tried has been a mismatch.

No amp does everything well. Pass amps are biased towards great midrange and in my humble opinion, aren't the last word in bass control.

Well, I'm just saying what my ears are telling me, in my system, my room etc (although at least two other audiophiles agree that the Pass is warmer than the Bat in my system and that the Bat has better bass).

From what I read, Class A sound is warmer. For example, see keithr's post in this thread:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1278694266&&&/Amps-in-the-same-class-as-Pass-XA-5-seri

Those on the hunt can buy mine which are for sale here on Audiogon. :-)

There's nothing wrong with any of the items and I've tried them all with the Bat. I'm not selling them because they sounded 'bad', I bought some of them simply to audition to see if they bettered my current fav.

Some I would prefer to keep (especially the Fire) but cannot afford to at the moment.

It's been a great learning experience and I have now found a combo that works for my taste and my room.