You could fry an egg on my STR receiver at "fairly" loud volumes even into a 8 ohm load, It clipped more then a tight a$$ shopper on coupon sunday. I could not imagine 4 ohm, valid point on the processor I would think. But in terms of power, my Sony is great where it is now, powering my old little Polk bookshelves in my garage!!!

Sunfire amps & processor Sammy 50" Crown amp 2-SVS SS Maple Ultras, Axiom 60s,22s,150cc, QS8s