the sound treatment i did in my room, 3 4x8 ft panels of 1 in. thickness, cost about $225.
i did not do it for looks, otherwise it would have cost more.
it changed the sound quality from unacceptable most of the time to superb sound even for movies at Ref. Level or any music CD/SACD i have.
this represents superb price to improvement ratio.
This seems a good example of what can be done for reasonable cost in an extreme case where the room itself was acoustically very bad. In my case the room itself is fairly good to begin with so furniture and speaker placement is sufficient to achieve a very good result.
