Fosi Audio I5 Open-Back Planar Magnetic Headphones

The Fosi Audio I5 is an open-back planar magnetic headphone with a 97 mm diaphragm, 28 Ω impedance and 98 dB/mW sensitivity, aimed at professional HiFi monitoring. It's for critical listening from a desktop amp in a quiet room, not for a phone jack, an open office or a plane.

Who the Fosi Audio I5 is for

• Critical listeners in a quiet room: The open-back planar design works best where sound leaking in both directions bothers no one.
• HiFi monitoring work: Fosi aims the I5 at professional HiFi monitoring, and it lists a 10 Hz – 50 kHz frequency response.
• Desktop amp owners: A large-diaphragm planar wants a proper amp behind it, so it suits an existing desktop stack better than a phone.
• Closed-dynamic owners trying planars: Expect a different kind of detail presentation, and give it a full listening session before judging.
• Skip it if: you need a headphone for an open office, a plane or a phone jack; it leaks both ways and wants a proper amp.

Fosi Audio I5 key specs

• Driver: 97 mm planar magnetic
• Design: open-back
• Impedance: 28 Ω
• Sensitivity: 98 dB/mW @ 1 kHz
• Frequency response: 10 Hz – 50 kHz
• Connector: dual 3.5 mm sockets; 3.5 mm plug, 6.35 mm adapter included
• Weight: 550 g
• In the box: i5 headphones, 6.35 mm adapter, 3.5 mm cable, user manual

Genuine Fosi Audio stock. Free shipping on every order, 45-day returns, 1-year warranty.