Your most indispensable "tweak"?

High Fidelity Cable- any of their wave guides plug ins

@68pete what did these do for your system?

@needfreestuff I finally dialed in my sub to a crossover and gain level that opened things up so much. Not an easy task. 

redwoodaudio
There is a big thread on them here in the forum. They simple made the sound so much cleaner sounding across the board. Back around vocals where much stronger, able to see deep into the sound stage. More black space around the sound. 

Here is a few.
1. Sorcer X4
2. Critical Mass Footers under components
3. Iso Acoustics GAI 1 under speakers.
4. Stillpoints Aperture 2's

No one's going to say "divorce"?