I think the matching of amp and preamp is emphasizing the wrong pairing. I find that matchning the amp with the speakers is more important. Discounting magic solutions like Krell's CAST, the amp preamp interface is not full of hidden problems. The speaker however can be a benign or devil load for an amp. I own Thiel 3.6s and was forced to a Krell KSA-200S because the speakers wanted lots of current. I tame this bright combo with a SF Line-3. Its a wonderful combination but I had to start with speakers and work backwards.
