Rank the tweaks, geeks!

In terms of efficiency, I‘d rank anything contributing to eliminating EMI/RFI highest. So: passive filters (Acoustic Revive, Akiko et.al.) followed by contact enhancers (Acoustic Revive, Mad Scientist et.al.) followed by cables (Phono, USB, Server, Dac and Preamp power cables in that sequence).On USB specifically: Intona Isolator

If you feel like spending lots of money: Bybee Golden Goddess speaker and RCA between pre and power amp, they really make a big difference once you got the front end sorted.

In terms of isolation: speakers first (Symposium or Townshend), tube dampers (EAT, Duende Criatura) Black Ravioli under components.

Without question, a great tweak was an Ohio Class SRA platform under my TT. It was like this sophisticated complex piece of gear was finally able to perform as designed.
And a recent innovation in my system is QSA light blue fuses in my mono blocks. They bring presence and structure to the music turning good to great sound into great gripping sound.
I am so impressed that I have ordered the next up yellow.
And certainly good power is central. Having Shunyata Triton/Typhon combination was a major lift. Hard to say which tweak is actually the best.

I don’t consider cables a tweak. Rather they are a main component.

Go nuts over speaker placement.  Fine tune positioning to a fault. Regularly unplug & re-plug all connections.   Keep the stylus & cantilever clean.  Give your stuff time to warm up.

@artemus
Great tweaks — perhaps a sub-topic: best *cheap* tweaks!

@earlflynn "Search bar." Er, good one. I'm not asking to look something up, I'm asking people to report out their experiences. This is a *discussion* forum and I'm starting a *discussion.*

@stuartk and a couple others — some platforms etc. are on my list, too. @antigrunge -- looking into those items, especially on EMI/RFI.

@calvin Thanks! And what a great list and the detail is so helpful. Lots to try, there.

@mc

Yes, impossible. Impossible to rank these. For the simple reason it is impossible even to say what it is this list means.

Happy to hear people phrase things in any verbiage that tickles them, seem appropriate, and approach it in any way that makes it possible. Your list is most helpful. You listed things from least to most expensive. Is this also a list from least to most *impact*? Imagine you were giving someone advice, and they said, "Bro, I can spring for just two tweaks now and then I have to lay off for a while." Your first two items on the list would comprise your reply to them, I'm assuming.

@nonoise — gotcha. Speaker cables are part of the system, not a tweak. Perhaps part of an "upgrade" but not a tweak. Fair correction. Thanks for the rest of your list.

@mglik Fair point, accepted.