I've heard lots of good things about the LSD2 but not much about the CK-40. Besides color, they look superficially pretty similar. Is this just a case of similar chinese outer body type with differing internals?
The SP C4 (of which I owned a pair briefly) don't seem that outwardly similar to the CK-1...
I guess a follow up that I should have started with...Are either Studio Projects or Avantone considered US companies? Neither of their 'about us' pages on their websites are all that descriptive, but feel like they're mostly based in China.