Rubbersoul, my 7500 drives my Martin Logan reQuests--rated a nominal 4 ohm with dips to 1.2 ohm--without a problem. Your 7700 will be just fine. Enjoy the speaker hunt.
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Yamaha CX-A5000 pre-pro
Outlaw 7500
Oppo BDP-83
Samsung 65" LED TV
Front: Martin Logan reQuests & Logos
Surround: Martin Logan Fresco i via Outlaw OAWA3
Sub: ACI Maestro w/ ICE amp