THX U2 system.
KS-525 Surrounds (4)
KW-120 Subs (2)
What I like about the 650s: Voicing; Refinement; Definition; Directivity. Every room has specific needs. Mine is a bit on the large and on the active side, so the directivity of the KL-650s is particularly beneficial. The superb voicing that Klipsch has rendered with the THX line is heavenly; never harsh, or honky/horn sounding, but terrifically defined and refined. I am told that Klipsch took a really long time to bring these to market so that the voicing was just right and virtually identical to their state of the art professional cinema line, the Grand Cinema (I think it is called). Dialogue, effects, and music are all strikingly superb. I found their size just right for my need to conceal them.
The surrounds are extremely well matched to the LCRs, and broadcast and disperse sound with amazing power/authority and fidelity. Their not-so-big physical appearance is deceiving. Big sound!
The subs were a big surprise. I had been using some heavy-hitter JBL HTPS-400s, but had heard them get a little strained. The two Klipsch THX subs are immensely superior and never challenged to deliver in even a large room. Immense effortless power and seamless blend with the other speakers.
This system will easily perform in a range of systems; good receivers or seperates, and certainly with refinements like upscale EQ like Auydessey, etc.. MultEQxt did a terrific job for me overcoming some acoustic nuances caused by the build-in of the 650s. Also did a terrific job matching the KS-525 surrounds, refining the subs performance and blending them with the rest of the system.
Certainly my system until torn from my cold, dead fingers.