Best Tweaks.....

Not necessarily the cheapest tweak...depends on who's doing it!...but I've found that a dedicated power line and some good outlets...Hubbell or Furutech ect. provided the best "tweak" for me....opened things up considerably!

Here's my two cents worth:
Quantum Symphony noise suppression/EMF stabilizer
Herbie's Grungebuster2 CD mat, Tenderfeet, Bigfooter & Halo rings for tubes
Mapleshade Silclear-on every contact you have, including tube pins
Hospital grade cryo'd outlets

1- Neuance platforms
2- Quality powercords. I'm only using Shunyata Diamondbacks and Copperheads, far from the most expensive, and still the improvement was stunning!
3- Balanced power supply for CDP and turntable. Keep them on separate filtered outlets though so the CDP doesn't pollute the TT.
4- separate dedicated homerun electrical lines with quality outlets (FIM, Furutech, many others).

Velodyne SMS-1, no question about it.

Thanx,
Russ

Go the the refuse can of a granite or marble company. Use the pieces of stone to mount your components on to. Good for vibration and other issues.