This is the best tweak of them all:
Also trim your ear hairs. They each have their individual osscillation frequency and when excited by air vibrations they distort the sound.
Questionable Tweak
Someone on Audiogon mentioned using an air purifier to improve the sound of their system. I dragged my wife's purifier into my listening area, cranked it up, and.......,no change at all. They said it removes dust particles,to improve the sound. Has anyone ever heard of this?Is there any science to back this up?