Who are the most underground high-end companies


When I say underground I am talking about companies that fly below the radar. Not much talk about them on audio forums, little if no reviews, no formal advertising, rarely see their gear at shows.

taters
You don’t want to go that far underground most likely. Things heat up fast.

I've heard Goto.  Would go there if I could afford it.
Electronics: Electrocampionet - I have owned the Nemo's & they were great!
Speakers: Voce Audio - One of the very best buys in all of audio - I have owned the V1's (ugly but awesome) & now own the V2;s - Much better looking & sound fantastic