I think your 6011 is very capable of powering those speakers and don't believe you'll gain any sonic advantage adding that amp. I added an amp to mine, but went with something newer and more powerful. No real audible difference between it and just using my SR6011 until I get into some pretty ridiculous volumes. Even then it's not a night and day thing. Just a little more stable, and I'm talking really cranked up. Like home alone and put the dogs outside cranked up.