The simple answer is Yes. The fun part though is finding the best way to do it. I’ve done this for parties and Super Bowl Watching for a block party. Its not difficult to do, and can be a lot of fun.
If you’re dealing with TWO Dolby Digital Systems its very simple. Connect the main system up as usual, and then if the system has an OPTICAL OUTPUT, you can connect that to your other system if it has an OPTICAL INPUT. Depending on the brand of the main unit it may pass Dolby Digital sound out to the other receiver, or it may just pass stereo – then the other system can do a simulation for surround.
Another option if you don’t have the optical output is to simply run a set of analog audio cables (white and red) from the output of one system to the input on the other.
I’ve done both and it works great either way. Plus its fun to show off your 10.2 sound system when friends come over. Just make sure to keep the area well ventilated!
Hope this helps,