For those of us with older ears....
Hold your nose and breathe out to pressure your ears. You will find your HF hearing acuity improves massively. Really. Any doctor hear know why?
Problem is it's a bit uncomfortable and fatiguing.
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?