Yamaha's have a bad 4ohm reputation, but the 2700 is their latest so I'm not sure about that one. The word on the 2600 was it was okay as long as you weren't looking for obscene volume levels. The 2700 is likely to be better. Don't expect to get good info from Yamaha their canned response is to tell ya it won't work, but the audioholics.com reviewers say otherwise ... but the 2600 did have limitations. The 2700 I'm not sure about. I would hope it would be better.