Know of a "Dirt Cheap" tweak?

Plus you get to spend time in the narrow confines under the house, where, I assure you, no one is going to come and bug you. 

Last week was lube time for my TTs.  This time used 5w30 Mobil One Synthetic.  It might be expectation bias but I like what I hear.  

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.