Join Date: Jul 2001
Location: Ithaca, NY (aka Treehuggerville)
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ceilingmax doesn't vibrate / rattle like normal suspended ceilings even with normal acoustic tiles, so I wouldn't bother with drywall tiles. Plus, soundboard based acoustic tiles will have more sound absorption characteristics than drywall anyway (they have a higher STC rating).
Also, I wouldn't trust the person on the phone at ceilingmax unless you talked to an engineer, the first level of tech support is clueless. A 2x2 drytall tile would we either 8.8 lbs (1/2") or 11.2 lbs (5/8"), I wouldn't trust ceilingmax holding that much weight
Due to the fact that the tiles are "snapped in" with ceiling max, combined with the fact that ever corner is attached directly to the joists and not hanging, the tiles hardly vibrate at all, the tiles are VERY secure to the joists.
I have ceiling max in the garage with drywall walls and concrete floor, it's a VERY live room. I have a nice stereo in there with kickin' bass and you never hear the tiles rattle, they are VERY secure. For a party once I had my Definitive Tech PF1500 sub out there and you could FEEL the concrete moving to Heavy D's "Rump Shaker", and the tiles were silent.
However, since they are so frequently coupled to the ceiling, sound transmission is horrible. Ceilingmax is a GREAT choice if you are trying to save headroom, a POOR choice if you are trying to eliminate sound transfer to above. Unfortunately, these two requirements do not go well together, it is very hard to do both very well at the same time.