Originally Posted by Stealth3si
Originally Posted by DonH50
FOH said to stay away from foam, yet you link to a site selling foam?
Interesting that they show sound absorption coefficient greater than 1... I did not think that was possible; need to review the standards they reference. Also note you need a stack of them in each corner.
We have installed Auralex LENRD corner absorbers that look very much like those in our church and I have been very dissappointed in their performance, especially at LF. Be sure to follow the comparison link on that website: http://www.foambymail.com/acoustic-foam-product-comparison.html
Home Depot, Lowes, and similar places offer Corning 703/704 that will probably do a much better job for less, assuming you are willing to trim a sheet or cloth over it to dress it up, and mount a couple of sheets (4") 2" - 4" off the wall.
Mineral wool is another alternative, but is harder to work with and sheds more.
think i'd rather not diy. no time.
Then try commercial products from sites that build their absorbers out of something besides foam.
Acoustic foam is made out of oil, and you know about what has happened to the price of that stuff!
Rock wool is made out of slag waste from steel mills, cotton batts are made from industrial and home waste. Glass wool is made out of rock and sand.
The plastic foam looks great and is easy to fabricate, while all the rest have to be faced with fabric or something like it to look decent.
Because the plastic foam is expensive, people who fabricate absorbers from it tend to go light on thickness and density to keep their prices looking competitive.