Boom Mat 5-1/4-inch Speaker Baffles
Crutchfield Customer Review (What's this?)
I put these behind the midrange driver in a pair of Pioneer Home Speakers model SP-FS52. The midrange open to the two lower woofer witch caused all kind havoc with the sound. Cleaned them right up. The mat material is not that quality and very fragile. There is not a big selection to chose from for this part.
Pros: deep, trim able,
Cons: fragile, easy to tear