^^^
Foam, yes, is ineffective.
Acoustical foam is very effective.
http://www.acousticalsolutions.com/acoustical-foam?gclid=CLj38JPL37kCFa1FMgodOC4AOg
Foam, yes, is ineffective.
Acoustical foam is very effective.
http://www.acousticalsolutions.com/acoustical-foam?gclid=CLj38JPL37kCFa1FMgodOC4AOg