Ok it looks like a mod on the Monoprice headphones. I'm a big Bottlehead fan, but idk if this is worth getting since I'm used to higher end headphones like HD800. Also interestingly, the Monoprice 8323 is a low impedance headphones, but this modded version is designed for use with the Crack, an OTL amp. The description doesn't sound like the mod affects the impedance of the headphone though.
More info and impressions:
Edited by Sonido - 3/12/14 at 9:46am