Audiophilepure

http://goo.gl/nMXyyn

“The Flat-4 Nami is a dual-dynamic earphone built for Olasonic by Japanese Hi-Fi house Ocharaku. The twin 10mm drivers of the Flat-4 are oriented back-to-back, with a “sound pipe” connecting the chamber in front of the rear driver to the primary sound tube just before the nozzle”