jvc ha-fx300b in-ear headphones black
the new jvc ha-fx300 employs a range of sound-enhancing technologies including an aluminum evaporation diaphragm a new internal dual-metal structure and aluminum housing . the new aluminum evaporation diaphragm used in the ha-fx300 reproduces high-frequency detail more accurately than conventional cellulose or polymer-based diaphragm designs . to further enhance performance the headphone features jvc s new bi-metal structure . the drive unit is housed in a stainless steel base wrapped in a high-specific-gravity brass ring to eliminate vibration and energy loss . other innovations are aluminum housings designed to reduce resonance and the use of ofc oxygen-free copper to minimize transmission loss in the 1-meter cord . the ha-fx300 also offers a plug that is compatible with apple s iphone . to ensure a snug comfortable fit the headphones come with three different sized silicon rubber earpieces and a pair of memory foam earpieces for a customized fit . these provide superior isolation from external sounds and minimize sound leakage .