In reply to:

Perhaps I do this to justify the price of the SPL meter, but if we add wall treatments or move things around in the room a bit, I'll sit down and do a quick level check to see if anything has changed. In some cases, there have been measurable difference in sound levels, especially on the surrounds.



Very true, Doug. The effects of the room, furniture, and speaker placements are, as always, potentially huge.

And in my opinion, the cost of the RS meter (worth 3 DVDs?) is already justified the very first time you calibrate the system! It surely makes a MUCH BIGGER sonic difference than an expensive amp (or CABLE! -- now ducking) upgrade.