Here's a question for those interested in the EAH-830's slightly bizarre construction: Technics claimed in the AES paper cited in the first post that the EAH-8x0 series achieved its engineering goals by using "acoustic circuits including double cavities for controlling the desired responses, which have twin peaks in the frequency response as measured with a dummy head."
I'd expect to see a labyrinth or a tuned cavity or something like that. And twin peaks? That's just scary. Any guesses, based on the photos of the innards, where these might be?
Did anyone here buy that EAH-830 that was on the auction site recently?