Room Acoustics overkill or worse?

I wouldn't recommend over damping the room. It all depends on the room. Today most acoustical engineers and audio setup people prefer combinations of diffusors and absorbers.

An over damped room robs a system of vital presence and energy, so go slowly.

Maybe, maybe not. I looked for your Virtual System and you have nothing posted; therefore, we have no idea if you're using dipoles, rear ported, front ported, omnis or whatever. Also, we have no idea of the room size and reflectiveness of the remaining walls.

Generally, assuming the room is otherwise relatively lively, this will not be a problem. I take it your wife wants to cover the wall with silk fabric. Normally that's done over a light batting and would not be a problem. If you start adding thick absorbing material behind the silk, then you'll really deaden the room a lot.

Of course, you should look into LEDE technology. That's live-end-dead-end. This is used in some studios and demonstration room. The speakers are at the dead end of the room. It takes a powerful bass speaker to overcome the lost bass reinforcement. If you've got low ceilings and a narrow long room and need to place the speakers on a short wall, then this can be a good solution.

Anyway, generally, so long as you don't get carried away with absorbing material behind the silk, you'll be ok and that'll be a very nice listening room. Yes, you may need to move your speakers back a little closer to the wall, but that's no big deal. Any significant room changes will demand re-setting of the speakers.

Dave

thanks for all the replies suggestions. I should have described my setup better. Sorry I have to get down to posting my system soon............

The room is 15'x12' with a sloped ceiling along the shorter wall. I have large french windows along one of the 15' walls and an 8' opening on the opposite side into a double ht. living room. The walls are 9" brick with cement plaster. The ceiling is concrete, but covered from below with pine wood slats. The floor is a hard cement mosaic floor. Typical construction in India.

The speakers consist of a pair DIY 15" subs, which are ported at the back and a pair of sealed MTM's along the shoter wall. I have have no resonance from any of the cabinets. Solid 1 1/2" MDF. I usually put a carpet on the floor. I also have a 25" TV between the speakers.

So far the foam treatment has really cleaned up and tightned the sound. The most pleasing change has been the increase in scale and body of the instruments. I wanted to put panels behind the speakers and in the corner but better half frowns at that idea.................

Great, your description is a BIG help. Yes, your room, particularly with 15" subs, can probably use a ton of damping. Have at it. You could make the speaker end almost totally dead and it wouldn't be a problem. As it is, I can't imagine that the speakers are not overpowering the room. Thankfully the walls, floor and ceiling are sturdy, so you can probably get a quite nice result deadening one end.

Here's very important advice from someone married almost 40-years, et the wife get the silk. ;-)

Dave

That sounds like a very lively room! As to the specific question, I can attest that too much treatment can degrade the sound. I moved my system into an untreated room with absolutely nothing on any wall or window. It was like an echo chamber in there. I purchased a room treatment kit from Auralex and went to work. The kit included more treatment pieces than my room required, as I had some DIY panels, but that didn't stop me from using them.
I would listen as I went along and it did get to a point where I was noticing a degradation in the sound from too much absorption. I removed some treatment until I got it correct, or what I thought sounded best. Some of what I removed was behind the speakers. A totally dead wall does sound like overkill to me but your ears will judge. Good luck and do post your system. I'd be interested to see the outcome.