"If you are not going to use the redundant channels you would do better selling the receiver and getting a proper two channel amp."
Not really. I am in the same situation, with my Anthem AVR only used to power my centre channel and one subwoofer. But, more importantly, it serves as a hub for outputting the L and R channels to the HT Bypass on a Musical Fidelity M6si and it allows for connection of all my HT components via HDMI. Something a "proper" two channel amp wouldn't be capable of doing.