Steve Sells- (Preface) I am by no means an audiophile, but I have owned/enjoyed Klipsch SP-1's, RF-82II's, RF-63's, and now RF-7II's. The 82II's, 63's, and 7II's all have been powered by Pioneer Elite SC-57. The SC-57 is a nice receiver with very healthy 140 watts per channel of d3 amp power.
My experience-
I just sold a very nice pair of RF-63's and bought a pair of RF-7ii's. First, let me say that the RF-63's are VERY NICE Speakers. I originally had bought the RF-82II system, but with a RC-64II (instead of the RC-62II). I auditioned the 63's at a local dealer after reading their reviews on the forums. I loved the way they sounded and had to have 'em. So I traded in my 82II's, brought the 63's home, and have been in audio nirvana for the past 2 years. The 63's were a definite step up from the RF-82II's which were a step up from the SP-1's IMO.
With the 63's, I heard things in my music and blue ray collection that I never experienced before with the SP-1's or the RF-82II's. The highs are crystal clear and the bass is tight and articulate. The depth of the cabinet is around 20" so its like 3 cannons firing at your seating position. Particularly amazing sound quality for music.
From 63's to RF-7II's-
The reason I replaced the 63's with the RF-7II's was to have a matching system (RC-64II timbre match and cone color/design). I really worried that I wouldn't like the 7's as much as the 63's. It took 6 months of research and various auditions to pull the trigger on the Rf-7II's.
What can I say about the 7II's? They are big...I mean really big...in size and sound. The RF-7II's are every bit as refined as the 63's, but with a more output. The bass extension is tight, deep, and powerful. The RF-7II's really show their prowess when driven hard, either musically or with movies. They exhibit an effortless quality.
Bottom line-
The move from the SP-1 to the RF-82II was so-so (I really enjoyed the SP-1's 8" active driver's bass- still have them at my vacation home). The move from the RF-82II to RF-63 was phenomenal. The move from 63's to RF-7II's was noticeable, but not as much as the move from RF-82II to the 63's. I have overall been very happy with both the 63's and the RF-7II's.
You will be too.