What are you using for amplification? I use a Marantz 7011 receiver which is basically your 7702 processor plus a built-in 9 channel amplifier. I use Apple TV for streaming and it sounds quite good.
My Marantz system is in the same room as my reference 2 channel system and I can compare the two systems easily. Without getting too much into it, I really enjoy listening to my Marantz system when I want a change of pace from my 2 channel system.
If you have not done so already, try using the Audyssey room correction feature which should have come with your 7702 processor. It is simple to use and improved the sound quality of my HT system.
The other thing that I did that really improved the sound quality of my Marantz system was to add a pair of subwoofers. After applying Audyssey room correction, my subs seamlessly blend with the rest of my HT speakers. I get a big soundstage with solid and precise imaging with this setup. I second auxinput's sentiment that the sound is "a very refined and full sound with lots of impact."
My Marantz system is in the same room as my reference 2 channel system and I can compare the two systems easily. Without getting too much into it, I really enjoy listening to my Marantz system when I want a change of pace from my 2 channel system.
If you have not done so already, try using the Audyssey room correction feature which should have come with your 7702 processor. It is simple to use and improved the sound quality of my HT system.
The other thing that I did that really improved the sound quality of my Marantz system was to add a pair of subwoofers. After applying Audyssey room correction, my subs seamlessly blend with the rest of my HT speakers. I get a big soundstage with solid and precise imaging with this setup. I second auxinput's sentiment that the sound is "a very refined and full sound with lots of impact."