What commerical audio system tweaks provide sound quality improvement??

Caig makes a good cleaner and a liquid polymer that is conductive

Don't waste money on spendy interconnects but gold plated ends are worthwhile.

ARC puts dampers on their tubes so you should too; turntables & cartridges would be best in another room if you cannot isolate them from surface vibrations as well as airborne vibrations.

Add that to what todd said above and ignore the trolls

Nitwit convention in progress. Please stand by. Randi is apparently applying the conductive fluid with his fingers.

@terry9 valid points!

Terry9
"One does NOT need to touch both hot and neutral to get a shock. All that is required is an electrical path from hot to ground. That can happen innumerable ways: damp floor, kid spilling his drink, or any other innocent means of being in contact with a grounded object while cleaning."

You would have to be cleaning the outlets with a conductive material to get shocked. Hint: do not use a coat hanger or similar item to clean your contacts. Tell your kid not to stick his fingers in both holes at the same time.