Help me find a smooth solid-state amp?

Nice speakers, IMO. I auditioned them twice and almost purchased them. I listened to them with ARC tube gear and a Classe integrated. They sounded better with tubes, but still great with the Classe. They also require, beleive it or not, around 500 hours of break in and if yours do not have this many hours on them, I would wait before auditioning other gear. I am not familiar with your amp. Older Adcoms were a little raspy in the HF's but that was a long time ago. You may want to try auditioning/demoing a DAC for your DVD player and see if it is the source that is bothering you. And, as Craig mentioned take a look at the cables in your system starting with the source. I picked up Harmonic Truthlink IC's used at this site for $125.00 to tame the HF's on my Castle speakers and they did the job. If you have not used isolation devices on your player you will want to do that first as well. They do not need to be expensive, Vibrapods work very well in smoothing out HF's when used on the source and also the preamp in your case. Speaker placement and room treatment (what is allowable) will tame highs. If you did not need as much power I think that the Conrad Johnson tube integrated would be a nice match for the 5.0's. That is what I was thinking anyway when I listened to them, though I never heard the two together. I would start with the basics and go from there. Good luck.

Djjp: Sorry I typed 500 and meant 300 hours above. Still quite a long time, though my little Castles took around 200 or so being played at lower levels.