What commerical audio system tweaks provide sound quality improvement??


If you look in any audio catalogue, whether Music Direct or Audio Advisor, there are usually several pages of  system tweaks.

What  tweaks in your opinion, work and actually provide real audible improvement??

Thank you , SJ

sunnyjim
This hobby bears a lot of resemblance to the early settlers in America who traveled across this land. A great many grew tired and settled in the Midwest and the Southwest. Those who were braver and more curious made it all the way to the West Coast. 

J Edgar Hoover: Do you go all the way?

Shirley Temple: No.

J Edgar Hoover: I don't either.