with 98dB efficient speakers, you could go SET, especially with 300B tubes, and be fine in your room for all but the most demanding music. You can't really just go by the # of watts in an amp to match a system, and matching the preamps can be tricky. There's probably a padding resistor in the preamp already to adjust the input, and you could increase the size of that easily and then have more use of your volume control. Big problem now is many sources (cdp's especially) have very high outputs relative to older eqpmt, so many preamps 'overload'. Or you could put an L-pad at the input of the power amp. imho, Pi's way outclass most Klipsch's if you're looking for new speaks...