I have always loved klipsch's speakers i own a pair of f-2 and a pair of rf-35's. The rf-63's are truly amazing the highs are breathtaking and the lows are tight and accurate. Playing some Gerald Albright and the sax is right there in the room with you beautiful speakers expensive but worth every penny. I am driving these babies with a 200 watt per channel rotel amp and matching rotel receiver but with these babies all you need is 65 to 70 watts. Sensitivity rating is 99 very high. Just totaling loving them.