Dreaded wall unit

Doesn't sound like much of an agreement to me. You have bigger problems than your stereo system......

Shakey

It's a sad situation for you.

It would be a lot better if you could bring the speakers out 1 inch to make them even with the front.This is causing a sound imaging problem.I don't know if yours could be front mounted like a regular speaker.That Dynamat material may be mostly for thin metal that a car is made of to get rid of the tinny metal resonance if its what I think it is.If the cabinet is thin and vibrating away,something like that may damping it some.There are speaker filler materials(the filling in pillows looks and feels real similar))that could dampen bass resonance problems. Fiberglass is used too,but not user friendly.I think moving the speakers out 1 inch for starters if possible would sound more open and natural.Here is the filler material link.>>[http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-330]

I agree with Hifitime that the front of your speakers should be at least equal to the edge of your cabinet. If not you will get reflections off the edges that will distort the sound.

Get a new wife or grow some balls