Hi Davey
For starters, I'd pick up a Radio Shack analog SPL meter, set it to slow, use the Yamaha's speaker test tones and set the speakers so their output is equal at your listening position.
Check as to whether you have to repeat this process for different sources (Some Onkyos require set ups for each source).
Then, I'd get the Avia test disc, and use the SPL meter.
I listen to all sources through my receiver and with as many speakers as the source will permit. For example, through Adelphia cable, Fox news only outputs through the center channel, but other channels will decode for all 7.2 channels.
Good luck with your new system. Sounds like you're going to love it!
