I am currently shopping for my acoustic tiles... I have been looking at these two models:
Armstrong Optima (model number 3159) which is 1.5" thick
Armstrong Painted Nubby (model number 3102) which is 1" thick
The Optima has the best acoustic properties except for low frequencies where the Nubby is better. Here's the data:
Optima (the 1" thick one): 0.65 at 125 hz, 0.91 at 250 hz, 0.84 at 500 hz, 1.01 at 1000 hz, 1.02 at 2000 hz and 0.97 at 4000 hz
Painted Nubby: 0.78 at 125 hz, 0.98 at 250 hz, 0.85 at 500 hz, 1.00 at 1000 hz, 1.02 at 2000 hz and 1.00 at 4000 hz.
I assume the 1.5" thick Optima does a somewhat better job thant the 1" thick one, but I don't have the numbers to compare it to the Painted Nubby.
Also, the Optima has a better light reflectiveness coeficient, which is probably bad for a home theater, right? The Painted Nubby being cheaper, I am planning on choosing it.
Does anyone think that the whole process is rubbish or have I made the correct assumptions and analysis? Any ideas? Since both only come in white, should I definitely paint them? They don't have to be black, right, only need to be dark?