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FOSI AUDIO I5 OFFLINE VERSION Headphones
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Fosi Audio I5 Offline Version 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. Each driver incorporates a double array of balanced Neodymium N50 magnets for precise, stable diaphragm vibration. This greatly reduces any form of distortion for a clear, authentic sound reproduction. The earcup structure is made of CNC-machined aluminum, combining robustness and pleasing aesthetics. Silky pads and a leather headband complete the structure, providing optimum wearing comfort. With its 28 ohm impedance and 98dB sensitivity, the I5 is relatively easy to drive, although it will require a good amplifier capable of delivering over 250-500mW of power. In addition, its dynamic range from 10Hz to 50kHz offers the most immersive listening experience. The package is completed by a detachable audiophile-quality balanced 4.4mm jack cable.
Fosi Audio I5: 97mm magnetic planar diaphragm
The Fosi Audio i5 headphones feature an advanced 97mm planar diaphragm, using an ultra-thin membrane just 2 microns thick. This extreme thinness allows the diaphragm to react with remarkable speed and precision, dramatically reducing distortion and delivering crystal-clear sound reproduction. The diaphragm is suspended between two rows of N50 neodymium magnets, arranged in a balanced push-pull arrangement, ensuring uniform magnetic force across its entire surface. This design guarantees perfectly controlled diaphragm movement, with extended frequency response (up to 50kHz) and excellent dynamics, even at high volume. The result is a surgically precise sound, with fine reproduction of micro-detail and a very airy soundstage worthy of much more expensive headphones.
Fosi Audio I5: Extremely comfortable headphones
The Fosi Audio i5 also stands out for its excellent level of comfort, designed for long listening sessions. Despite its imposing size, its well-balanced structure and top-of-the-range materials ensure both sturdiness and comfort. The shape-memory metal headband adapts naturally to the user's morphology, distributing weight evenly to avoid pressure points. The circum-auricular ear pads are covered with a soft, breathable fabric, providing good insulation while allowing air to circulate, thus limiting heating. The chassis combines anodized aluminum and genuine walnut wood shells, offering elegant aesthetics and a premium quality feel in the hand and on the ears. This attention to construction makes the i5 as pleasant to use as it is to listen to.
Fosi Audio I5: A detachable audiophile cable
The Fosi Audio i5 comes with a detachable 3.5mm dual-mono audio cable, ensuring both versatility and reliability. This high-quality braided cable is designed to minimize interference and signal loss, guaranteeing clear, faithful audio transmission. Its flexibility and light weight make it pleasant to handle, while offering good resistance to wear and tear for everyday use. Thanks to its balanced 4.4mm termination, the i5 can be easily connected to a wide range of audio devices like smartphones, Hi-Res players, portable DACs or headphone amps.
Please note that a Fosi Audio I5 headphone version is also available with a detachable 3.5mm jack cable.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Headphone |
| Headphone type | Circum-aural open-back |
| Diaphragm | Planar Magnetic |
| Max. SPL | ≥ 120dBSPL |
| Frequency response | 10Hz-50kHz |
| Sensibility | 98dB/mW @ 1kHz |
| Nominal impedance | 28 ohm |
| Recommended driving power | ≥ 500mW |
| Recommended minimum power | 100mW |
| Detachable cable | |
| Cable length | 1.5m |
| Cable conductor material | OFC 5N silver-plated copper |
| Headphone connector | 2x 3.5mm Jack mono |
| Cable terminaison | Balanced 4.4mm Jack |
| General | |
|---|---|
| Weight | 550g |
| Dimensions | 16 x 24 x 11.5cm |
| Package | 1x Fosi Audio I5 headphones 1x Detachable balanced 4.4mm jack cable |
| Color | Black |
| Color | Wood |
| Impedance (Ω) | 28 |
| Efficiency / Sensitivity (dB) | 98.0 |
| Lowest frequency (Hz) | 10 |
| Highest frequency (Hz) | 50000 |
| Wireless | No |
| Cable termination | Jack 4.4mm |
| Headphone / Earphone connector | Jack 3.5mm |
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