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  • 4 VIDEOS
  • Fosi Audio i5 Open-Back Planar Magnetic Headphones with 97mm Ultra-Large Diaphragm, CNC Metal & Walnut Wood, Audiophile Wired Studio Headphones for Multi-Source Devices
  • Delve into I5 in More DetailFosi Audio

Fosi Audio i5 Open-Back Planar Magnetic Headphones with 97mm Ultra-Large Diaphragm, CNC Metal & Walnut Wood, Audiophile Wired Studio Headphones for Multi-Source Devices

4.6 out of 5 stars (54)
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About this item

  • Immersive Listening, Pure Original Sound : Experience high-fidelity sound with nano-thin diaphragm and symmetrical magnets. Precision acoustics deliver high-resolution, low-distortion sound for live-performance realism
  • 97mm Ultra-Large Diaphragm : 97mm Nano-Level driver at 2μm thickness reveals microscopic details. Sputtered silver alloy coating enhances clarity while ensuring long-term sonic consistency and durability
  • Ergonomic Design, Long-Lasting Comfort : Memory metal headband with multi-axis pivoting earcups adapts instantly. Silicone sliders enable micro-adjustments. Breathable skin-friendly earpads 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 fast transient response. Acoustically transparent open-back grille minimizes resonance for expansive, holographic soundstage with studio-grade accuracy
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This item: Fosi Audio i5 Open-Back Planar Magnetic Headphones with 97mm Ultra-Large Diaphragm, CNC Metal & Walnut Wood, Audiophile Wired Studio Headphones for Multi-Source Devices
$769.99
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Sold by Fosi Audio and ships from 鶹 Fulfillment.
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Product Description

001

Fosi Audio i5

Open-Back Planar Magnetic Headphones for HiFi Audiophiles

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

i5 Democratizing Planar Sound

Merchant video

Democratizing Planar Sound: Uncompromised Clarity, Comfort & Craftsmanship


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.

  • Transducer Type: Planar Magnetic Transducer
  • Maximum SPL: ≥ 120 dBSPL; Recommended Power: ≥ 500 mW
  • Frequency Response: 10 - 50,000 Hz; THD: < 1% @100dBSPL
  • Sensitivity: 98 dB/mW @1kHz; Nominal Impedance: 28 Ω

  • A. Disconnect the cable and shake gently to check for any persistent noise.

    B. Try different recordings to ensure the issue isn't with the quality of the recording.

    C.Test with another source device to check if the source device is faulty.

  • A. Avoid storing in humid environments for extended periods.

    B.Keep the i5 away from places where it might fall off.

    C.Keep the i5 away from high-temperature areas.

  • A. Avoid compressing the ear pads hard.

    B. Do not press or poke the interior of the ear pads with fingers to prevent damage to its planar driver.

    C. Do not wear metal earrings or similar items while using the i5, as it contains magnets.

  • Burn-in is not mandatory for i5. Normal use over time may stabilize the diaphragm and enhance the sound performance, particularly in terms of bass extension and detail clarity. However, this process is not essential for sound quality.

Discover Our Range of Headphone Amplifiers

K7

SK02

SK01

K5 PRO

Q4

DS1

DS2

Customer Reviews
4.8 out of 5 stars 14
4.5 out of 5 stars 320
4.4 out of 5 stars 432
4.0 out of 5 stars 1,456
4.2 out of 5 stars 3,132
4.2 out of 5 stars 458
4.3 out of 5 stars 363
Type
DAC+Headphone Amp DAC+Headphone Amplifier/Preamp Headphone Amplifier/Preamp DAC+Headphone Amp DAC+Headphone Amp DAC+Headphone Amp DAC+Headphone Amp
Input
BT+OPT+COA+ USB-C+ 3.5mm Micro USB + Optical 3.5mm line in USB-C + OPT+ COA+3.5mm Micro PC-USB + Optical + Coaxial Type C+ USB A Type C+ USB A
Output
RCA+ 3.5mm Single-Ended+ 4.4mm 3.5/4.4mm Headphone, AUX/OPT line out, 3.5/6.35mm headphone RCA + 3.5mm Headphone RCA + 3.5mm Headphone 3.5mm + 4.4mm Headphone 3.5mm + 4.4mm Headphone
Treble & Bass Control
✔ ✘ ✔ ✔ ✔ ✘ ✘
THD
<0.0002% ≤0.001% <0.001% <0.003% ≤0.01% ≤ 0.0006%(SE) ≤ 0.001%(BAL) <0.0001%
SNR
≥121 ≥120 ≥108 >110dB ≥105 ≥120 ≥130
Terminating Impedance
16-300 Ohm 16-300 Ohm 16-300 Ohm 16-300 Ohm 16-200 Ohm 16-300 Ohm 16-300 Ohm

Product details

  • Language ‏ : ‎ Italian
  • Parcel Dimensions ‏ : ‎ 31.39 x 22.5 x 16.79 cm; 1.63 kg
  • Manufacturer ‏ : ‎ FOSI AUDIO
  • ASIN ‏ : ‎ B0FJX4CG4M
  • Item model number ‏ : ‎ I5
  • Country/Region of origin ‏ : ‎ China
  • Customer Reviews:
    4.6 out of 5 stars (54)

Product information

Technical Details

Frequency response ‎50000 Hz
Sensitivity ‎98 dB
Headphones jack ‎6.35 mm Jack
Model name ‎i5
Connectivity technology ‎Wired
Included components ‎User Manual
Age range (description) ‎Adult
Material ‎Aluminum, Leather, Wood
Specific uses for product ‎Music
Compatible devices ‎Common Audio Devices
Control type ‎Touch Control
Item weight ‎1.63 Kilograms
Water resistance level ‎Not Water Resistant
Control method ‎Push Button
Number of Items ‎10
Manufacturer ‎FOSI AUDIO
Place of Business ‎Shenzhen Foresight Technology Co.Ltd,Dalang street,ShenZhen,Guangdong,518000,+86 17722625601
Model ‎I5
Hardware interface ‎3.5mm Audio
Special features ‎Open-Back Design, Planar Magnetic Driver, Ultra-Large Diaphragm
Batteries included ‎No
Batteries Required ‎No
Material Type ‎Aluminum, Leather, Wood
Supports Bluetooth Technology ‎No
Manufacturer ‎FOSI AUDIO
Language ‎Italian
Item model number ‎I5
Parcel Dimensions ‎31.39 x 22.5 x 16.79 cm; 1.63 kg
ASIN ‎B0FJX4CG4M

Additional Information

Date First Available July 29 2025
Customer Reviews
4.6 out of 5 stars (54)

4.6 out of 5 stars
鶹 Rank

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