This might be a nice time to consider upgrading your power amplifier. A 7500 is a step up from the 755 and will work with either balanced or unbalanced (RCA/XLR) inputs.

Mine's actually running the mains unbalanced and the center and two surrounds balanced.
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Outlaw 990/7500/LFM1+/2xLFM1 EX
Kef 107 with KUBE
Kef XQ2c center
Kef 3005 surrounds
Samsung HL-67a750
Sony BDP-S301 Blu-Ray
Toshiba HD-A2
Denon CD
Harmony 880
Comcast HD DVR with external drive
Nintendo Wii