Kai gave you $10 to spend on your first purchase on Drop! Sign Up to learn more.
HIFIMAN HE-400i Planar Magnetic Headphones

A Lightweight Planar Magnetic Experience

HIFIMAN has taken its HE-400 series to new heights. Introducing the HE-400i: a pair of planar magnetic headphones optimized for critical listening and uncompromising comfort. Touted by HIFIMAN as 30-percent lighter than competing full-size planar magnetic models, the HE-400i drastically reduces fatigue while retaining a premium over-ear feel. Newly designed, beveled earpads made from pleather and velour optimize comfort and sound quality, while an extra-wide headband evenly distributes pressure on the head. A single-ended planar magnetic design delivers a wide-open soundstage with impressive spatial imaging and precise, neutral clarity across all frequencies. Featuring improved 93-decibel sensitivity and a newly added 3.5-millimeter jack, the highly responsive HE-400i works well when connected directly to any portable device, or when paired with a small-to-mid-sized amplifier.

Note: This run is for the 3.5-millimeter connector version of the Hifiman HE-400i.

HIFIMAN HE-400i Planar Magnetic Headphones

HIFIMAN: The Name Audiophiles Trust

Born in New York City in 2007, HIFIMAN has had a big influence on the audiophile world, and founder Dr. Fang has always had close ties with the community. He started out on Head-Fi and attended local meetups while pursuing his doctorate at Columbia. When he realized his PhD research could be relevant to his passion—the music-listening experience and the audiophile products that improve it—he started talking with forum members and meetup attendees about what they’d like to see in the next generation of headphones. Since then, the company has been featured in TIME, Forbes, and CNET’s “The Audiophiliac,” and won the CES Editors’ Choice Award. HIFIMAN is a natural partner for Drop because our goals are so aligned. At its core, it represents a passionate audiophile building a company that serves the rest of the community.

HIFIMAN HE-400i Planar Magnetic Headphones
HIFIMAN HE-400i Planar Magnetic Headphones


  • Operating principle: Open back
  • Drivers: Planar magnetic drivers
  • Earcup material: ABS polymer 
  • Earpad material: Pleather and velour
  • Frequency response: 20 Hz – 35 kHz
  • Sensitivity: 93 dB
  • Impedance: 35 ohms
  • Connector: 3.5 mm
  • Cable length: 4.9 ft (1.5 m)
  • Weight: 13.1 oz (370 g)


  • 4.9 ft (1.5 m) cable with ⅛ in termination and 3.5 mm connectors
  • ¼ in adapter


Estimated ship date is July 22, 2021 PT.

Payment will be collected at checkout. After this product run ends, orders will be submitted to the vendor up front, making all orders final.

Top Customer Questions9
How does this compare to the HE4xx?
Mar 8, 2021
Top Answer
I promise to let you know! I bought the HE-4XX from Drop last year. I found them to be very "utilitarian" and kinda a rough draft, or what appears to be an unfinished version. They do sound very...Read More
Mar 27, 2021
Is this the 2020 revision?
Feb 16, 2021
Top Answer
No, the 2020 revision doesn't have the suspension headband and instead has a solid arch. Though it doesn't have the old leather like box.Read More
Feb 16, 2021
What's the build quality on these?
Jun 28, 2021
Top Answer
Nevermind. I answered my own question: POOR. See Amazon reviews before you decide: https://shrtm.nu/jD3GRead More
Jun 28, 2021
Showing 3 of 9 questions
View All Questions
User Photos13
My next headphones from HiFiMAN
hooked it to a balanced 4.4 cable, sounds great
In action
Amazing product!
HE400i with STR-DH830 Receiver
Sounds good with my equipment
My first Planars. Looking forward to the custom cables.
Customer Reviews0
All of our reviews are from verified customers.
Showing 0 of 36 reviews
Recent Activity
Placed an order
Placed an order
Placed an order