Greetings. I am new to the forum, but not to Klipsch. I have owned my hereseys since I bought them new in 1985. About time to rebuild the crossovers. I use an Emotiva XPA-2 Gen2 along with the XSP-1 preamp. The combination sounds flat out wonderful. The Hereseys have never sounded better, and I have had some pretty good gear (parasound, Rotel, Quad). The 300 watts in the XPA-1 really play to the Heresey's strengths.