since you have bought classe already there is no alternative but to use interconnect to fine tune the sound. use cardas or audioquest copper cables!
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Kadlec, You didn't mention any acoustic room treatments...if you have a lively room, you might want to treat the 4 upper corners, the side walls the center of the front wall, and the center of the back wall with some acoustic treatments. You can make these yourself from 2" foam and cover them with any cloth that works with your decor. Use hot glue and Velcro to stick them up. (Look at Michael Green Room Tunes for placement and sizes.) Then you can play with speaker cables and interconnects. I'm not fond of the B&K amps, they tend to be boring, 2-dimensional, and lifeless. I've heard the Theils MCS1's with Classe cd, amp and preamp and also thought they were a little too bright. But try the room treatments first, then the cables, and then you can start swapping amps or cd players.
I believe there is nothing worse than trying to "tone-down" the Thiels with some "colorful" tube gear. That will simply spoil the Thiel's crispness and other strong points unless you spend thousands and thousands of dollars in a super tube amp. There are a number of appropriate ss amps that work fine with Thiels, including Classe, Levinson, and also Marsh Sound Designs. Alas, it could be that you are simply in the camp which believes the Thiels are bright and if that's the case nothing will really change your mind, in my experience. If so, my best advice would be to sell the Thiels and get something else. Although perhaps before doing so you may want to go to a couple of live music events to make sure what you are hearing is not the way real life sounds.
i used to use thiel 3.5's in my main system, & they weren't too bright, even when my adcom gfa-555 was the main amp, & not relegated to subwoofer duty! now, the thiels are doin' yust fine, in the kitchen, powered by a 35wpc audio-innovations integrated, fed from the main system thru its tape outs. hook up a turntable, & then see if the fatigue goes away. or, if ewe have a quality tuner, & uncompressed radio station, is there fatigue here, too? i'd suspect the fatigue is coming from your cd-player. when i had a solid-state preamp, the only way i could get rid of cd-fatigue was by using an ase z-man tubed buffer-stage, even w/speakers other than thiels. now, w/a tubed preamp, i don't need the buffer-stage.