Hong Kong based custom IEM and portable amp maker LEAR is looking for some kind of crowdfunding help to bring their new IEM to the market. It is simply called the 'NSS earphone', where NSS stands for Natural Stereo Sound, a technique LEAR developed for stereo sound enhancement. Judging from the picture, I'll have guessed it used a second transducer feeding an delayed sound of the opposite channel, which should gives you a crossfeed-circuit-like effect, but all done in the analog domain.
Check it out here.
[UPDATE] The crowdfunding price will is US$160 and the final retail price will be US$220+.
[UPDATE] The crowdfunding price will is US$160 and the final retail price will be US$220+.