Fosi Audio i5 Planar Magnetic Headphones

The Fosi Audio I5 Offline Version is an open-back planar magnetic headphone designed for audiophiles seeking precision, detail, and an expansive soundstage. Featuring a large 97mm ultra-thin diaphragm, it delivers fast transient response and highly accurate sound reproduction across a wide frequency range.

Its advanced driver design uses a dual array of N50 neodymium magnets in a balanced push-pull configuration, ensuring consistent diaphragm control and significantly reducing distortion. This results in clear, natural sound with excellent dynamics and detailed micro-resolution.

The I5 is built with premium materials including CNC-machined aluminum and elegant walnut wood earcups. Combined with soft breathable ear pads and a leather headband, it offers long-lasting comfort for extended listening sessions.

With a 28-ohm impedance and 98dB sensitivity, the I5 is relatively easy to drive but performs best with a quality amplifier. The detachable high-quality cable system, including balanced 4.4mm and dual 3.5mm connections, ensures flexibility and reliable signal transmission.

Features
97mm Planar Magnetic Driver
Ultra-Thin 2 Micron Diaphragm
Dual N50 Neodymium Magnet Array
Open-Back Design For Wide Soundstage
Low Distortion And High Detail Retrieval
CNC Aluminum And Walnut Wood Construction
Comfortable Circumaural Design
Detachable Balanced 4.4mm Cable
High Quality OFC Silver-Plated Copper Cable

Compatibility
Headphone Amplifiers
Portable DACs
Hi-Res Audio Players
Devices With 4.4mm Or 3.5mm Output

Specifications
Product Type: Headphone
Headphone Type: Circum-Aural Open-Back
Diaphragm: Planar Magnetic
Max SPL: ≥120dB SPL
Frequency Response: 10Hz-50kHz
Sensitivity: 98dB/mW @ 1kHz
Nominal Impedance: 28 Ohm
Recommended Driving Power: ≥500mW
Recommended Minimum Power: 100mW
Cable Length: 1.5m
Cable Material: OFC 5N Silver-Plated Copper
Connector: 2x 3.5mm Jack Mono
Termination: Balanced 4.4mm Jack

Dimensions & Weight
Dimensions: 16 × 24 × 11.5 cm
Weight: 0.55 kg

In The Box
Fosi Audio I5 Headphones
Detachable Balanced 4.4mm Cable
Detachable 3.5mm Cable
6.35mm Adapter
User Manual