Open-Back Planar Magnetic Headphones Jack 4.4mm 28 ohm 98dB 10Hz-50kHz The Fosi Audio I5 Offline Version is an open-air Planar Magnetic headphone. They feature a diaphragm no less than 97mm in diameter, offering a wide soundstage. Ea...

  Open-Back Planar Magnetic Headphones Jack 3.5mm 28 ohm 98dB 10Hz-50kHzThe Fosi Audio  I5 Online Version is an open-air Planar Magnetic headphone. They feature a diaphragm no less than 97mm in diameter, offering a wide soundstage. Ea...