Ray Garrison

It will absolutely change the sound. Whether the change is a good thing or a bad thing depends upon (to name a small subset of factors that play a role) (a) what you stuff it with ( how much you use © whether the stuffing is randomly distributed inside or pushed against the sides of the cabinet (d) the degree to which the speaker is exciting the room's standing waves (e) the proximity of the current bass response extension to any currently unexcited standing waves (f) the volume at which you listen to music (g) the output impedence of the amp at low frequencies and the degree to which it interacts with the speakers impedence (h) well, you get the idea... If you try it, be careful that you don't strip the screws removing and reattaching the passive resonator, and watch out of the crossovers and internal wiring. Ray

Not begin a regular poster to this topic, being an old guy of 45 with La Scalas and all, I still have to point out that Hofy screwed up. Everybody knows speakers sound better on inert stands. He should have duct taped cinder blocks to the wall, THEN taped the ProMedias TO the cinder blocks. Just a helpful hint from an old fart.