My initial thoughts are that you will take the 4600 over the 773. There are some extensive eq options in the 4600 that are right up your alley.
Without going into great detail the Yamaha has far more power then I would have thought. For once I agree with a Audioholics review.........but, dam does this thing get hot! I went home at lunch and cued up a bunch of music through my computer and came back to work for a few hours. Snuck home later on and it was still pumping out the tunes through all channels but like I said, it is hot. I left it going and will see how it is when I get home tonight.
