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
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So many fantastic companies "fly under" the radar.  I assume many of these brands are unknown in US/Canada as the membership here is predominantly North American.  I guess the bigger question is why are they unknown here?  Have the unsuccessfully tried to get a foot hold or not even bothered as their sales are successful elsewhere?