Hi,
That's part of the reason I returned my Yamaha and didn't buy Onkyo. Marantz 7200, JVC DP10(my new one), I believe Sony 5, and most Denons will handle 4 ohms. I blew off the sony because of poor multi room features and an impossible remote. The Marantz sounded the worst and Denon didn't have some features that I wanted.
That's part of the reason I returned my Yamaha and didn't buy Onkyo. Marantz 7200, JVC DP10(my new one), I believe Sony 5, and most Denons will handle 4 ohms. I blew off the sony because of poor multi room features and an impossible remote. The Marantz sounded the worst and Denon didn't have some features that I wanted.