Interesting stuff about "stealth" cover for TV.Sounds like Defense Dept .stuff.I had same phenomena when friend had is dog cage between speakers with blanket over it.I told him just use blanket when they go in for night and your stereo is of.Made big difference.But even though the cage had huge gaps and was not a solid it made difference when removed.Too many folks keep their rack between their speakers when they could sue long speaker cables or better XLR connects between pre and amps on floor.I have thought of "treating" my traditional 10" by 60+" windows behind my Speakers with either sonnex tiles on plywood and just hinge them to swing into a full square when listening better to use a diffuser as opposed to absorptive pattern to do so.think I migh also try buying 6" plastic pipe using acoustic tile or at least on half of it.Then finish by making pedestals that then and this way you can realy tune the room at least somewhat concerning the speaker refelction.Can be big benefits for little money.But even cheaper is getting clutter around speaker cleaned as much as room permits/.
Cheers
chazz
Cheers
chazz