HIFIMAN Open-Back Planar Magnetic Headphones Review (2026): A Spec-Based Look
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This hifiman he400se stealth magnets version review focuses on the HIFIMAN HE400SE, an open-back planar magnetic headphone. It uses a planar driver design where conductive layers cover the diaphragm, reducing distortion compared to dynamic drivers. The Stealth Magnet design is acoustically transparent, allowing sound waves to pass without interference. These two specs define its sonic character. The headphones are wired, connecting via a 3.5mm cable with a 6.35mm adapter. They weigh 13.8 ounces and feature an adjustable lightweight headband for comfort.
What stands out
- Planar magnetic driver with conductive layers covering the diaphragm for lower distortion.
- Acoustically invisible Stealth Magnet design reduces wave diffraction turbulence.
- Open-back over-ear form factor for a spacious soundstage.
- High sensitivity suitable for low-voltage portable hi-res audio players.
Who it fits
Good fit for
You should consider these headphones if you prioritize accurate, full-range sound with low distortion. The high sensitivity makes them a good match for portable hi-res audio players or low-voltage sources. The open-back design suits listeners who want a natural acoustic presentation. The durable casing and lightweight headband offer comfort for extended studio or home listening sessions. If you value technical accuracy and planar driver performance, this wired option fits your setup.
Who should skip it
You should look at another option if you need wireless connectivity, as these are strictly wired headphones. The open-back design means they do not isolate sound, so they are not suitable for noisy environments or public transit. If you require a closed-back design for privacy or bass response, these planar magnetic drivers may not meet your needs. The lack of active noise cancellation and the need for a 3.5mm connection also limit their use with modern smartphones without an adapter.
Verdict: The HIFIMAN HE400SE offers a technically accurate, low-distortion listening experience through its planar magnetic drivers and Stealth Magnet design. It is best suited for critical listening in quiet, wired setups.
Key specs for HE400SE
Form Factor: Over-Ear Open-Back
These headphones sit over your ears rather than inside them. The open-back design allows air to pass through the ear cups, creating a wider, more natural soundstage. This setup is ideal for critical listening in quiet rooms. It prevents the sealed-in pressure of closed-back models, making long sessions feel less claustrophobic. You should consider this if you prioritize accurate imaging and spaciousness over noise isolation.
Driver Type: Planar Magnetic
Planar magnetic drivers use a thin, conductive film spread across the entire diaphragm instead of a traditional voice coil. This design distributes force evenly, significantly reducing distortion and improving transient response. You get clearer details and tighter bass control. This technology is often found in high-end studio monitors. Choose this if you want high fidelity and low coloration for mixing or detailed music appreciation.
Connectivity: Wired, 3.5mm, 6.35mm adapter
This model connects via a physical cable, ensuring zero latency and no need for battery charging. It includes a standard 3.5mm jack and a 6.35mm adapter for professional audio gear. The wired connection guarantees consistent power delivery from your source. You do not need to worry about wireless interference or pairing issues. This is the best choice for studio work and high-resolution audio playback.
Weight: 13.8 ounces
Weighing 13.8 ounces, these headphones have a substantial build that may feel heavy during extended use. The mass comes from the planar driver assembly and the metal frame. While the lightweight headband helps distribute pressure, you might notice the load on your head after a few hours. Compare this to lighter dynamic models if comfort is your primary concern for daily commuting or travel.
Recommended Use: Studio
The manufacturer recommends these for studio environments, indicating they are tuned for accurate monitoring rather than consumer entertainment. The open-back design and low distortion help you hear every detail in a mix. This makes them suitable for audio engineers and producers. You should use them in a controlled acoustic space. They are less ideal for noisy environments where isolation is required.
Design and build details
The HIFIMAN HE400SE features an over-ear, open-back layout. According to the listing, the drivers are protected by a newly designed casing. This construction aims to enhance durability and shield the internal components from environmental factors. The ear cups sit fully over your ears, creating a seal that directs sound into your ears while allowing air to pass through the back. This open design contributes to a natural soundstage but requires a quiet environment for best results.
The headphones measure 12 inches in length, 10.5 inches in width, and 7.09 inches in height. They weigh 13.8 ounces. The listing notes an adjustable lightweight headband designed for comfort during extended listening sessions. This structure helps keep the unit cool, even in warm weather. The color options listed are silver and black, providing a standard aesthetic for studio or home use.
Connectivity is wired only, using a dual-sided high-performance 3.5mm cable. A 6.35mm adapter is included for compatibility with professional audio gear. The lack of wireless components keeps the device simple and reliable. You can connect it directly to portable hi-res players or desktop interfaces without needing batteries or pairing processes. The planar magnetic driver and stealth magnet technology are housed within this sturdy frame, prioritizing acoustic accuracy and physical longevity over portability or wireless convenience.
Setup and daily use guide
You plug the included 3.5mm cable directly into your audio source. The listing notes that a 6.35mm adapter is packaged with the headphone for maximum compatibility. This allows you to connect to standard studio gear or larger input jacks without needing extra purchases. The dual-sided cable design suggests you can swap the connector side if needed, though the listing does not specify the exact pin configuration. Because the HE400SE has high sensitivity, it pairs well with low-voltage sources. You do not need a powerful amplifier to drive these planar magnetic drivers. Portable hi-res audio players can deliver sufficient power for clear, full-range output. The open-back acoustic design means sound escapes the ear cups. This creates a wider soundstage but also means you will hear background noise, and others can hear your audio. You should use these headphones in quiet environments. The lightweight adjustable headband distributes weight evenly. The listing states this design keeps your ears cool during long sessions, even in warm weather. The over-ear form factor provides a secure seal around your ears, though the open-back nature prevents isolation. You can adjust the headband to fit your head size. The durable casing protects the drivers from daily handling. You simply connect, adjust the fit, and listen. The wired connection ensures zero latency and consistent performance without battery management. This setup is straightforward and requires no software or pairing procedures.
Before you buy HE400SE
You should verify your audio source matches the HE400SE’s high sensitivity. The listing states it pairs well with low-voltage portable players. You must use a 3.5mm cable or the included 6.35mm adapter. This wired connection limits mobility but ensures stable signal integrity. Keep the open-back design in mind. Sound leakage is natural with this acoustic layout. You need a quiet room to enjoy the full soundstage. Avoid noisy environments. Clean the ear pads regularly. Dust affects the planar diaphragm’s performance over time. Store the cable carefully to prevent fraying. These headphones sit alongside dynamic models in our guide. They offer lower distortion for critical listening. You get accurate, full-range output from the stealth magnets. Check if your setup supports open-back acoustics. This model suits studio use and focused listening sessions. It does not isolate noise. You need a dedicated space to appreciate the wide imaging. The lightweight headband helps during long sessions. Ensure your source provides enough power for clean playback.
Check before you buy
- Verify your audio source supports high sensitivity planar drivers.
- Ensure you have a quiet room for open-back acoustics.
- Check if you need a 6.35mm adapter for your gear.
The product at a glance
HIFIMAN Open-Back Planar Magnetic Headphones
Best for: Portable hi-res audio players
- Form Factor
- Over-Ear Open-Back
- Connectivity
- Wired, 3.5mm, 6.35mm adapter
- Audio Features
- Stereo
- Recommended Use
- Studio
- Driver Type
- Planar Magnetic
- Dimensions
- 12 × 10.5 × 7.09 inches
View on Amazon: HIFIMAN Open-Back Planar Magnetic Headphones Affiliate link
The HIFIMAN HE400SE features over-ear open-back planar magnetic drivers. Stealth magnets reduce wave diffraction for accurate sound. High sensitivity suits low-voltage portable players. Wired connectivity uses a 3.5mm cable with a 6.35mm adapter. The lightweight headband aims for comfort during long sessions. This model targets listeners seeking detailed audio from dedicated sources.
Pros
- Planar magnetic drivers for low distortion
- Stealth magnets reduce acoustic interference
- High sensitivity for portable players
- Includes 6.35mm adapter
Cons
- Wired connection limits mobility
- Open-back design lacks noise isolation
- Requires external amplifier or player
Good fit if
- You want detailed sound from a portable player
- You prefer open-back acoustics for room sound
- You prioritize driver technology over wireless convenience
Skip if
- You need wireless Bluetooth connectivity
- You require noise isolation in loud environments
- You want to use standard phone jacks without an adapter
Verdict: HIFIMAN HE400SE Open-Back Planar Headphones deliver precise audio for portable hi-res players. They suit listeners who value driver accuracy and open acoustics over wireless freedom.
Specifications side by side
| Spec | HIFIMAN Open-Back Planar Magnetic Headphones |
|---|---|
| Form Factor | Over-Ear Open-Back |
| Connectivity | Wired, 3.5mm, 6.35mm adapter |
| Audio Features | Stereo |
| Recommended Use | Studio |
| Acoustic Design | Open-Back |
| Driver Type | Planar Magnetic |
| Dimensions | 12 × 10.5 × 7.09 inches |
| Weight | 13.8 ounces |
| Color | Silver,Black |
| Model | He400SE |
Frequently asked questions
Are these headphones suitable for studio monitoring?
Yes, the HIFIMAN HE400SE is recommended for studio use. Its open-back acoustic design provides a natural soundstage that helps you hear details accurately. The planar magnetic driver reduces distortion, which is critical for precise audio work. This setup allows air to pass through the ear cups, creating a wider image ideal for critical listening in quiet environments.
What type of driver technology does the HE400SE use?
The HE400SE uses a planar magnetic driver. In this design, conductive layers cover the diaphragm, which helps reduce distortion compared to traditional dynamic drivers. The Stealth Magnet design is acoustically transparent, allowing sound waves to pass through without interference. This technology aims to deliver precise audio reproduction for listeners who value driver accuracy.
Does this model support wireless Bluetooth connectivity?
No, the HIFIMAN HE400SE features a wired connection only. You must plug the included 3.5mm cable directly into your audio source. A 6.35mm adapter is also packaged for compatibility with standard studio gear. This wired setup ensures stable signal integrity but limits your mobility while listening to music or working on audio projects.
How heavy are these over-ear headphones?
The HIFIMAN HE400SE weighs 13.8 ounces. The dimensions are 12 inches in length, 10.5 inches in width, and 7.09 inches in height. These measurements describe the physical footprint of the over-ear design. The weight and size are typical for open-back planar magnetic headphones, which often use larger drivers and open frames to achieve their specific acoustic characteristics.
What color options are available for this model?
The HIFIMAN HE400SE is available in Silver and Black. These color choices apply to the over-ear, open-back design. The listing specifies these two options for the Stealth Magnets version. The visual finish does not affect the acoustic performance, which relies on the planar magnetic driver and open-back construction for sound quality.
Is this headphone compatible with portable hi-res players?
Yes, the HE400SE is best for portable hi-res audio players. The listing notes it pairs well with low-voltage portable devices. You should verify your audio source matches the headphone’s high sensitivity. The wired connection via the included 3.5mm cable ensures a direct signal path, which is often preferred for maintaining audio quality with portable sources.