Agree with ahendler and learsfool. I do have a listening room which was engineered from the ground up. There are other tweaks out there that are non-traditional and a little woo-woo to some that may be worth looking at:
http://http//www.stereotimes.com/post/stillpoints-aperture-acoustic-panels/
http://http//www.6moons.com/audioreviews/3tweaks/1.html
http://http//www.stereotimes.com/post/stillpoints-aperture-acoustic-panels/
http://http//www.6moons.com/audioreviews/3tweaks/1.html