The HIFIMAN HE400SE, featuring the innovative Stealth Magnets design, is an entry-level headphone that delivers audiophile-grade sound quality.

This model employs advanced orthodynamic planar magnetic driver technology, which is known for its superior performance compared to conventional dynamic drivers.

Reviewers from various platforms, such as Headphones.com, frequently highlight the HE400SE as a top contender in providing exceptional audio quality at an affordable price point.

Its design incorporates cutting-edge acoustic engineering principles, allowing it to achieve remarkable transient speed and clarity. This results in a listening experience that is both immersive and detailed, making subtle nuances in music more apparent.

Additionally, the HE400SE excels in distortion control, which ensures that sound reproduction remains accurate and true to the source. As a result, it serves as an excellent gateway for audio enthusiasts looking to delve into high-fidelity audio without breaking the bank.

The combination of comfort, performance, and value makes the HIFIMAN HE400SE a standout choice for anyone seeking to elevate their listening experience.

Core Technical Specifications

Driver Type: Full-Size Planar Magnetic (Orthodynamic).
Magnet Configuration: Acoustically Invisible Stealth Magnet Design.
Acoustic Design: Open-Back, Circumaural (Around-Ear).
Frequency Response: 20 Hz – 20,000 Hz.
Impedance: 32 Ohms.
Sensitivity: 91 dB.
Physical Weight: 385–390 grams (excluding cable).
Connectivity: Detachable dual 3.5mm inputs on the earcups.

Key Performance Technologies

Acoustically Invisible Stealth Magnets

Unlike the square or blocky magnets used in older planar blueprints, the patented HIFIMAN Stealth Magnet design features uniquely curved outer edges. This aerodynamic profiling allows sound waves passing through the array to flow freely without creating wave diffraction turbulence. By making the physical magnets acoustically transparent, the headphone drastically suppresses sonic reflections and distortion down to barely audible levels, producing pure, highly accurate imaging.

Planar Magnetic Transient Speed

Traditional dynamic drivers vibrate via a small voice coil attached to a centralised point on a cone. The HE400SE distributes conductive traces across the entire surface area of an ultra-thin, weightless diaphragm. Driven evenly by a powerful magnetic grid, the diaphragm moves uniformly and instantaneously, delivering lightning-fast transient response, pinpoint micro-detailing, and tight instrument separation.

Open-Back Realism

The outer faceplate of each earcup features a wide, protective circular metal grill instead of a sealed chamber. This open structure lets trapped back-wave air pressure escape completely, resulting in an airy, natural, three-dimensional soundstage. Sound feels less like it is trapped inside your skull and more like a live room presentation.

Sonic Signature & Power Demand

Tonality: Balanced-neutral sound profile with an incredibly clean, linear sub-bass extension, crisp mid-range rendering, and a slight tilt toward upper-treble sparkle.
Amplification Needs: Although rated at a low 32 Ohm impedance, its 91dB sensitivity makes it notoriously power-hungry. While it will play audio directly out of standard laptop audio jacks, it requires a dedicated desktop DAC/AMP or a high-quality portable amplifier to unlock its full dynamic punch, lower-end fullness, and headroom.

Material Build & Ergonomics

Hybrid Comfort Ear Pads: Features thick, asymmetric round ear cushions angled to match human skull anatomy. They are upholstered with solid pleather on the outer rims to seal in low frequencies and finished with soft, sweat-resistant fabric mesh facing the skin for breathable comfort during long multi-hour sessions.
Reinforced Suspension Headband: Outfitted with an adjustable steel-reinforced headband wrapped in rich padding and faux leather to evenly distribute the 390g weight across the crown of the head.
Modular Dual 3.5mm Wiring: Equipped with a detachable 1.5-meter (4.9ft) cable that plugs independently into the base of each earcup. It comes standard with a gold-plated 3.5mm source plug alongside a screw-on 6.35mm (1/4″) studio adapter.

SPECIFICATIONS

Name: HIFIMAN HE400SE Stealth Magnets Over-Ear Open-Back Full-Size Planar Magnetic Wired Headphones
Brand: HIFIMAN
SKU: d777dss0r2fg009thavg
Availability: InStock

Active Noise-Cancellation: No

Brand Name: Hifiman

Category: Earphones & Headphones

Certification: CE,FCC

Communication: Wired

Connectors: 3.5 MM

Control Button: No

Earcups Type: Open-back

Features: Detachable Cable

Frequency Response Range: 20 – 20000

Function: Monitor Headphone,for Video Game,Common Headphone,HiFi Headphone

High-concerned chemical: None

Impedance Range: up to 32 Ω

Is wireless: No

Line Length: 1.5

Material: ABS

Origin: Mainland China

Resistance: 25

Sensitivity: 91

Style: Wired in-ear headphones

Support APP: No

Support Memory Card: No

Vocalism Principle: Orthodynamic

Volume Control: No

Waterproof: No

Wireless Type: None

With Microphone: No

Additional information

Color	Stealth Version, Non Stealth Version
Ships From	Russian Federation, China Mainland

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Shipping & Return

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