Basically what you should garner from amdoverclocker is:
He's running a denon 3806 rated at 120 wpc. the RF-82's are rated at 150 watts RMS. You should be able to push the super sensitive Klipsch RF-82's (98 dB /1 watt / 1 meter) at 120 watts per channel at 10 feet distance (dB is loss is doubled somewhere around 6 feet I believe, but you can look that up) you'll be peaking each speaker at 109.1 dB and with 2 rf-82's the overlapping sound creates an increased loudness equal to about 3dB and can play them both around: 112dB peak power (not continuous) just about maxing out your receiver.
If you have 5 expect your peak to be even louder... just note that it would be uncomfortable.
Because music and movies can have 10-30 dB peaks and you don't want to clip your speakers you should be playing somewhere down in the 90 dB range which, although it may not be loud enough for him, it will likely make the neighbors complain and your ears ring after a while.
What does that mean and how can you figure stuff like this out... programs all over the net.
Things like Peak SPL Calculator (PSC which is freeware)http://www.myhometheater.homestead.c...alculator.html
which is an SPL calculator on the web and corresponding SPL levels. Just make sure you read the instructions well.
OSHA has guidelines for noise loudness exposure
Keep asking questions and read up all you can, there's a whole world of knowledge out there that's still untapped.
Know that I'm not even close to an expert but I attest that this is to the best of my knowledge so far.