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
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 ;-)
KAVAKAT1  be a man and fight for the dedicated listening room: its your house!! When I was younger I could do it, not any more :-(    Thats why you see headphones and portable CD player next to my "sweet spot" Big'n'Loving family successfully neutralizes all the benefits of my hi-end rig...
Some decades back VPI was manufacturing what was called a Magic Brick by many(their DB-5).   Nothing more than transformer laminates, inside a wooden box.   I still have a pair atop the power transformers of my Cary monoblocks, which cause an obvious(not at all subtle) focus of my system's imaging and sound stage, which isn't too shabby to start with.    If you can find them, they're popular and costly.    Whether one ascribes the benefit to them attracting magnetic flux(away from circuits) or damping vibrations(by their weight), or both- they DO improve performance.   Similar benefit can be achieved by obtaining simple steel BBs and filling plastic boxes with them.   Placing these above and below components, especially digital devices, will make a wide variety of changes(both improvements and detriments), so- experimentation is KEY!    The OP wanted, "Dirt Cheap" and this fits the bill: ( https://www.amazon.com/Silver-Zinc-Plated-Metal-4-5mm/dp/B01E9JUGU6/ref=sr_1_9?ie=UTF8&qid=14811... )  &  ( https://www.amazon.com/Maymom-Plastic-Hinged-Crafts-Jewelry/dp/B00ZNPWR4E/ref=sr_1_6?ie=UTF8&qid...  )   There are bigger boxes available of course and in some instances, more weight/more steel is beneficial.
@rodman99999 I still remember starting this discussion many-many years ago at the meet of Chicago audio society (hope I am not the only one from that meet who is still drinking'n'smoking) and the general consent was Yellow Pages on top of each box. I bought a bunch of Shakti Stones, they look better on top of my Naim amps and power supplies (better than Yellow pages I mean) but in terms of sonics - shoot me! I cannot return them so they stay