The cheapest one I know of was mentioned (I think) by Stereophile: take your glasses off. Works only for the eyeglass wearers of course, but for the "lucky ones" it provides an extra benefit of Total Immersion into music. You wont be able to read/text/surf, only music! Goes well with "Immersion Box" sets by Pink Floyd ;-)
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!