Fosi Audio i5 Open-Back Planar Magnetic Headphones
Features
- Nano diaphragm, studio-grade sound
- 97mm driver, extreme detail resolution
- Walnut build, premium craftsmanship
- Open-back, expansive soundstage accuracy
- Accessory Lineup: 4.4mm standard cable, XLR adaptor, replacement earpads.
Fast, Free Shipping!
24 Months Warranty
30-Day Money-Back Guarantee
Lifetime Customer Support
Fosi Audio i5 Open-Back Planar Magnetic Headphones
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
-
Shipping Information
We offer free worldwide shipping, except for certain regions such as Ukraine and Russia, where our services are currently unavailable.
-
Customer Support
WhatsApp: +8613716612254
support@fosiaudio.com
Mon-Fri: 3:00 AM - 3:00 PM PST -
FAQ’s
If you have any questions, please refer here: FAQs
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.
- Transducer Type: Planar Magnetic Transducer
- Maximum SPL: ≥ 120 dBSPL
- Frequency Response: 10 - 50,000 Hz; THD: < 1% @100dBSPL
- Sensitivity: 98 dB/mW @1kHz; Nominal Impedance: 28 Ω
- Recommended Power: ≥ 500 mW
Product details
Description
- 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
What‘s in the box？
- i5 Headphone
- 6.35mm Adaptor
- 3.5mm Cable
- User Manual
FAQs
Please read our FAQs page to find out more.
What should I do if there is an unusual noise using the i5?
A. Disconnect the cable and shake gently to check for any persistent noise. If it continues, please contact our support team.
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.
How should I store the i5 when not in use?
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.
What precautions should l take when using the i5?
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. D. Do not use speaker amplifiers to drive the i5.
Is burn-in necessary for the i5?
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.
Customer Reviews
To the Team
A absolute gem. Thank you 🙏
These sound really good, especially considering their price point. I have them as my desktop go-to with FiiO K17 through balanced output using Roon as the source. When mildly EQ'ed in K17 they offer amazing clarity and detail, well on par with headphones that retail for more than twice. This is yet another excellent product from Fosi in my collection.
I own over 25 sets of headphones, and many of them are more expensive than this set. But after a few listens, this is my go-to set. The adjustments made in response to listener feedback are spot-on, and the sound is addictive to most genres of music. I wasn't sure what to expect, but I am so glad I made this purchase.
Ein sehr gelungener und Qualitativ hochwertiger Kopfhörer, mit einem super Klangbild.
