AVS Forum Special Member
Join Date: May 2011
Location: Ft. Collins, CO
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I would think either one would be an upgrade with the extra features such as networking and front USB port. The 773 also has a full complement of pre-outs if you want to add a beefier amp. The 673 does not have pre-outs except for a subwoofer or pair of subwoofers. That was one of the things I liked about the 665. It came with pre-outs and I used it as a pre-amplifier for a while.
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