Semi Closed Ear. Lightweight Copper-Clad Aluminium Voice Coils. 3.5mm Jack with 1/4″ Jack AdapterResponse: 20Hz-20kHz Sensitivity: 64db Impedance: 64 Ohms Power Handling: 1w Weight: 385g. The JTS HP-535 is an audiophile quality comfortable set of semi closed-ear dynamic stereo headphones with excellent frequency response. The headphone cable is terminated with a gold plated 3.5mm stereo jack connector and has a 6.35mm jack adapter included. These quality headphones are exceptional value for money and are perfect for use with a mixing desk- home studio or even you Hi-Fi!. headphones