The high rated sensitivity of the Klipsch can be deceptive. Consider the low impedance of two woofs, throw in some compounding phase angle, and you have a recipe for a more difficult load than cheap amps can cope with. Pick something that is solid into 4 ohm loads, whatever it is (AVR, separates, ??, not sure exactly what you need, so please elaborate).
I have the rf82iis as mains in an ht setup, but listen to all my music in 2 channel only. Have an older onkyo 705 as just a pre/pro, sending signals to an nad 275bee. This is amazing and the only time il upgrade is when I can afford rf7iis and another 275 for monoblock operation.
(2)RF-83 (1)RC-64ii (2)RF-82ii (2)RC-62ii
(2)Exodus audio tempest-x 15" subs in 200l sealed enclosures
Onkyo 705 pre/pro and rear surrounds
DSPeaker Antimode 8033 sub eq Behringer EP4000 subs
NAD C275BEE mains
AMC 2N100-3 surrounds and center