Ive used in loudspeaker cabinets works fine if design calls for it.
4" Carpenter memory foam behide your speakers ???
I put some 4 inch thick carpenter memory foam on the wall behide my speakers and I'm just AMAZED by the difference I'm hearing now!... The soundstage is so holographic and the sound just wraps around me now...this is highly addictive! Has anyone else tried this yet?