How do you enhance a bad listening room's accoustics without breaking the bank? thoughts?


I am looking at a cork wall covering product to help enhance my listening room acoustics. The room is in a condo and shares duty as an "L" shaped living / dinning room. As I have neighbor's on either side I was thinking of doing the one wall where the speakers are placed and the opposite wall where I have my sitting position (The Coach!).  I was thinking the entire sitting room wall (10x8) and the speaker area (10x8) on the opposite wall. This may also have the additional bonus of helping to reduce the noise coming from my stereo into those condo's next to me?
I was wondering what people's experience has been and successful materials used as wall coverings or panels.
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Before you buy any room treatments, read Jim Smith’s “Get Better Sound”. He has several sections relevant to your question...starting with determining the best position for your listening chair and loudspeakers.

Jim Smith’s profession is setting up and consulting on residential and commercial high end audio rooms and recording studios. He’s received several best-sound-of-show awards.

I have not worked with cork flooring and wallcovering since 1990, but back then "some" of it smelled.

The odor was sometimes caused by the adhesive and/or backing used but usually it was the cork itself.

Anyway, suggest researching your particular choices to see if this may be a problem.

DeKay

I have used GIK and Acoustimate in the past.  I have heard of supply issues with GIK recently.  I used Vicoustic Acoustic Cinema Round panels that not only look great on walls but they really helped my absorption issues greatly.  Check out their website.  I was also considering the Vic totems which act as absorption and diffusion panels.  
Our last house had a wall covered with cork and I'm sure that helped save the room 
GIK is running 60 to 90 days. 
I have built my own room treatments. Done in one weekend and they look good.