Owens corning 703

After reading Mr. Everest's book, I am attempting changes to my listening room. The walls are dry wall. The speakers are on either side of teh fireplace. I am planning to put on either side of the fireplace a sound absorbing material and cover it with a plaesing fabric so my fiance doesn't rip my head off.

I am looking into owens cornig 703 but it is a bit hard ot find in home depot-like stores

I am looking for some other ideas. Weyerhauser makes a 4 x 8 foot "sound deadening board" but the frequency caharcteristics are not available.
I know Mr. Porter used acoustic panels from owens corning and I hope he will chime in

jd