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Fosi Audio i5 Open-Back Planar Magnetic Headphones

SKU:
I5
$799.00
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Description

Fosi Audio i5

Open-Back Planar Magnetic Headphones

 

Democratizing Planar Sound
The i5 was born from our mission to make planar magnetic headphones more accessible — without compromising on sound quality, comfort, or design. Over a year of in-house development and acoustic tuning led to a headphone that delivers exceptional clarity, low distortion, and lifelike detail.
 
Immersive Listening, Pure Original Sound: Experience studio-grade audio fidelity with nano-thin diaphragm and stealth magnets. Precision acoustics deliver high-resolution, low-distortion sound for live-performance realism.

97mm Ultra-Large Diaphragm: Industry-leading 97mm driver at 2μm thickness reveals microscopic details. Magnetron-sputtered silver alloy coating enhances clarity while ensuring long-term sonic consistency and durability.

Ergonomic Design, Long-Lasting Comfort: Memory-steel headband with multi-axis pivoting earcups adapts instantly. Silicone sliders enable micro-adjustments. Breathable protein leather ear pads eliminate fatigue during extended sessions.

Refined Craftsmanship: Handcrafted walnut wood chambers paired with CNC-milled aluminum frame. Genuine sheepskin headband and signature S-design accents exude understated luxury and timeless sophistication.

Precision Magnetic Control: 44 N50 neodymium magnets ensure razor-sharp transients. Acoustically transparent open-back grille minimizes resonance for expansive, holographic soundstage with studio-grade accuracy.
 
About i5
The Fosi Audio I5 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 3.5mm jack cable with 6.35mm jack adapter for compatibility with the majority of HiFi equipment available on the market.
 

What's in the box?

  • i5 Headphone
  • 6.35mm Adaptor
  • 3.5mm Cable
  • User Manual


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: Yes
Cable length 1.5m
Cable conductor material: OFC 5N silver-plated copper
Headphone connector: 2x Jack 3.5mm mono
Cable termination: Jack 3.5mm stereo

 
 

 
For hygienic reasons, there are no returns on headphones once opened.
 
All in-stock headphones are available for personal demonstration in-store. We encourage you to try before buying to ensure satisfactory sound, fit, and functionality. 
 
If an item is defective upon receipt, please notify us within 30 days of purchase so we can arrange an exchange. For issues following 30 days, we will work with you and the manufacturer within the scope of each brand’s warranty and service policies.

Specs

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About Fosi Audio

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