Know of a "Dirt Cheap" tweak?


I am looking for tweaks to improve the overall sound quality of my audio system. I recently purchased some TPC contact cleaner and it made a believer out of me. I noticed a signicant improvement, as if a veil was lifted my system sounded more clear and transparent. Bass got tighter too. Do you know of any cheap tweaks that have made a SIGNIFICANT improvement to the sound quality of your Hifi system...let us know... :-) Comments welcomed!
kasboot
Good go Blake: Now you make me want to tweak my tweak as I just used peel off stick on tile that I found behind the fridge when having linoleum installed. I need to power eveything down to work on my cabinet in a couple of weeks and will try it on my CAL player this time instead of the cheap mini system and let you know what happens. The CAL is somewhat brick like already, but you never know til you try. I like the carpet tape, which should be pretty easy to remove and clean off with a solvent if I need to remove the tile.
MY wife re-arranged the furniture in her cathedral ceiling sun-room.

What a tweak! Now it sounds exactly the way it should!

There is now a rattan sofa between the OHM Walsh speakers along the wall and fairly close to corners that is 70% windows. Imaging and soundstage has improved dramatically.

She did this of course for reasons other than sound quality but stumbled onto a good sound tweak in the process.

The OHMs continue on Auralex subdude platforms which is key for taming the bass resulting from floor interactions in that room which is tile over suspended plywood floors, a sonic disaster to start with.

What a woman!
Mass. Adding weight to woofer enclosures may help definition. Bricks on top, whatever you have handy. :)

Especially good for 2 and 2.5 ways with the woofers closer to the tweeter than the floor.
Drill holes in refrigerator for cables and place all electonics on racks inside. Support refrigerator with springs to isolate the while kit and kaboodle.