SF Power 1s with Thiel CS 2.3s Enuf Pwr?

I too run Thiels - unless you will be listening at very moderate levels, the Power 1 is simply not enough amp for these speakers (save perhaps the CS.5s). It's not so much an issue of wattage as it is current. Thiels exhibit relatively flat impedence curves, but generally to the low side (4 ohms) and not all that efficiently. The above posts are correct: Thiels do sound best with tube amplification or warmer sounding SS gear. For the 2.3s, I wouldn't use less than the Power 2. Even that may sound strained on occasion with dynamic and complex classical passages. Unfortunately, quality tube current is not inexpensive - either initially or as a maintenance matter. A more cost effective alternative is to run a high current SS amp(s) and the most musical tubed preamp you can afford.