Fosi Audio i5 Open-Back Planar Magnetic Headphones with 4.4mm Balanced Cable

BH #FOI5HP44 • MFR #I5 BALANCED
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Fosi Audio i5 Open-Back Planar Magnetic Headphones with 4.4mm Balanced Cable
Key Features
  • For Audiophiles and Critical Listening
  • Neodymium Planar Magnetic Transducers
  • 97mm Drivers with Protein Leather Earpad
  • 10 Hz to 50 kHz Frequency Response
Designed with audiophiles, mastering engineers, and critical listeners in mind, the Fosi Audio i5 Open-Back Planar Magnetic Headphones features a wide frequency range from 10 Hz to 50 kHz for the most demanding of applications. The 97mm open-back drivers contain neodymium planar magnets that accurately reproduce transient and harmonic detail for a smooth listening experience. A memory metal headband stays in shape, with dual-axis arms that hold the earpads in place. Walnut wood chambers with aluminum frame show off the beautiful design and aesthetic. A  dual 3.5mm TRS to 3.5mm TRS cable and 1/4" adapter are included. Also included with the headphones is a 4.4mm balanced cable for use with high-powered amplifiers and devices.
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Fosi Audio I5 Balanced Overview

Designed with audiophiles, mastering engineers, and critical listeners in mind, the Fosi Audio i5 Open-Back Planar Magnetic Headphones features a wide frequency range from 10 Hz to 50 kHz for the most demanding of applications. The 97mm open-back drivers contain neodymium planar magnets that accurately reproduce transient and harmonic detail for a smooth listening experience. A memory metal headband stays in shape, with dual-axis arms that hold the earpads in place. Walnut wood chambers with aluminum frame show off the beautiful design and aesthetic. A  dual 3.5mm TRS to 3.5mm TRS cable and 1/4" adapter are included. Also included with the headphones is a 4.4mm balanced cable for use with high-powered amplifiers and devices.

Symmetrical Arranged High-Strength Magnetic Matrix
Enjoy ultralow distortion and a natural soundstage thanks to the use of 44 N50 neodymium magnets.
High-Transparency Acoustic Mesh
Rigid rear mesh ensures stable damping, smooth response, and an open soundstage, with minimal resistance.
Flexible Design
The Dual-Axis design allows the earpads to rotate to accommodate different head shapes.
Protein Leather Earpads for ComfortableListening
Made with perforated protein leather, the earpads breathe, ensuring a comfortable listening experience.
EAN: 6976136960898

Fosi Audio I5 Balanced Specs

Key Specs
Wearing Style
Dual Ear with Headband
Open/Closed-Back
Open-Back
Impedance
28 Ohms
Active Noise Cancellation
No
Frequency Response
10 Hz to 50 Hz
Built-In Mic
No
Audio Connector
1x 1/8" / 3.5 mm TRS
Included Adapter
1/4" TRS
Headphone
Wearing Style
Dual Ear with Headband
Earpiece Design
Over-Ear (Circumaural)
Open/Closed-Back
Open-Back
Sound Field
Stereo
Driver Type
Planar
Driver Size
3.8" / 97 mm
Impedance
28 Ohms
Active Noise Cancellation
No
Frequency Response
10 Hz to 50 Hz
Sensitivity
98 dB/mW at 1 kHz
Maximum Sound Pressure Level (SPL)
120 dB
Maximum Power Handling
500 mW
Volume Limiting / Child-Safe
No
Built-In Controls
No
Microphone
Built-In Mic
No
Connectivity
Wired Audio Connector
1x 1/8" / 3.5 mm TRS
Included Adapter
1/4" TRS
Cable Design
Detachable
Physical
Color
Black
Dimensions
9.4 x 6.3 x 4.5" / 24 x 16 x 11.5 cm
Packaging Info
Package Weight
4.825 lb
Box Dimensions (LxWxH)
12.7 x 9.2 x 6.9"

Fosi Audio I5 Balanced Reviews

Wow!

By Richard
Rated 5 out of 5
Date: 2026-05-20

I saw many reviews of this headphone on YouTube. I’m sure these technically proficient reviewers can do a better job with all the evaluation stats and graphs of special numbers which will tell you how fantastic these wonderful gems spec out. I will just say that after owning many headphones more expensive than these bad boys...they are the closest to my electrostatic $4500 headphones ...exceeding sound quality of anything I have heard...the tonal quality and listenability far outstrips any headphone I have owned. They are smooth and full range with no fatigue. I am using them with the Fosi Headphone amp in a streaming music mode using FLAC files. They are super comfortable with big padded ear cups. For this price they are a steal.

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