Jeff,
Ah, finally!
Quote:
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Do you think it would be a waste of time and $$ to line the back of the tiles with 2" 703 or 2" 705?
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No, that would be a good idea. Fluffy fiberglass works well too, as Glenn said, but it's best if it's at least 8 inches thick. Otherwise 703 or 705 is better.
There are really two issues here:
1. Bass trapping. Even if you can't or don't want to treat the entire ceiling above the tiles, you should run thick fluffy fiberglass up there around the perimeter, to at least add bass trapping in the wall ceiling corners. The more corner area you can treat the better.
2. Mid/high frequency absorption above the mix position. For that you should replace the tiles you have with 703 wrapped with fabric. You'll have to cut them in half and also trim them a bit to be just under 2 by 2 to fit in the grid. But that's a higher quality absorption than the type of ceiling tiles you have now.
--Ethan
PS: Jeff, it looks like you-know-who never showed up.
