Welcome to the Klipsch Forum @JohnThePipe. Your English is terrific, easy to read and understand.
I do not own either the Pioneer or the RB-61's that you do so I cannot be of much help. Pioneer is known to sound good with Klipsch and 120 wpc is plenty for the RB-61's.
When you hooked up the RB-61's to the Pioneer, did you re-run MCACC? This sounds like a set up problem.
Ah c'mon @Sprogk, make a deal! Those speakers look great and we've seen that center speaker on earlier threads, it is beautiful and tricked out to the max. That is not your average Belle, that is the nicest one I've ever seen.
After my 30 hour round trip to pick up speakers last week, I am now firmly convinced there is no such thing as a drive too far.