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Key technical details including frequency response, impedance, efficiency, and weight.
List of included items: headphone cable, earpads, and adapter.
Instructions for adjusting the headband for a comfortable fit.
Details on earpad construction and how to remove/replace them.
Guidance on connecting and using the headphones, including break-in.
The HIFIMAN HE400se is an open-backed headphone designed for high-fidelity audio reproduction, emphasizing a lifelike soundstage and spatial imaging. It utilizes specially designed planar magnetic drivers, a technology known for its ability to deliver detailed and accurate sound. The open-back design contributes to a more natural and expansive sound, often preferred by audiophiles for its ability to create an "out-of-head" listening experience, making music sound as if it's coming from the environment around the listener rather than directly into the ears. This design choice typically results in a more open and airy sound, with improved soundstage width and depth, though it also means some sound leakage will occur, making it less suitable for environments where silence is required.
A key feature of the HE400se is its single-ended driver configuration, which contributes to its ability to produce a lifelike soundstage and precise spatial imaging. This design choice aims to enhance the listener's perception of instrument placement and the overall acoustic environment of the recording. The headphones are designed with an increased efficiency, allowing them to be driven effectively by a modest-sized amplifier, or even by portable audio players and smartphones. This versatility makes the HE400se accessible to a wider range of users and setups, from dedicated desktop systems to on-the-go listening.
In terms of physical design and comfort, the HE400se is notably lighter than many comparable planar magnetic headphones, a feature that allows for comfortable listening sessions lasting hours. This reduction in weight is a significant ergonomic advantage, minimizing listener fatigue during extended use. The headphones incorporate a newly-designed headband and beveled hybrid earpads, both contributing to enhanced comfort and improved sound quality. The earpads, in particular, are designed with varying thicknesses to conform to the human head, ensuring a better seal and optimal acoustic performance. The thinner part of the earpad should be positioned on the front side of the ear cup, and the thicker part on the back, to achieve the intended fit and sound.
The headband adjustment mechanism is designed for user convenience. If the top of the headband does not make contact with the wearer's head, the sliding black blocks on each side of the headband can be moved to adjust the fit, ensuring the headband rests comfortably on the top of the head. This adjustability allows users to customize the fit for optimal comfort and stability.
For connectivity, the HE400se uses a supplied cable with screw-on 3.5mm mini plugs for the headphone side. These connectors utilize separate ground leads for each channel, a design choice aimed at minimizing crosstalk between the channels and preserving stereo separation and imaging accuracy. The cable also includes a 1/4" (6.35mm) headphone adapter, allowing connection to a wide range of audio equipment, including typical headphone outputs of amplifiers or dedicated headphone amplifiers. Users should be aware that some home amplifiers may automatically switch off loudspeaker output when headphones are connected.
Regarding usage, HIFIMAN recommends a break-in period of at least 150 hours of constant use to achieve optimum performance. This break-in period does not require high volume levels. During this time, the drivers are expected to settle and reach their full sonic potential.
Maintenance of the HE400se is straightforward. For cleaning the headphones, a soft, slightly damp cloth is recommended. It is crucial to avoid using any detergents and to ensure that no fluid enters the open sides of the headphones, as this could damage the internal components. The leather headband can be maintained using standard leather care products to keep it in good condition. The earpads are designed to be used at all times. If they need to be removed for replacement, they should be reinstalled as soon as possible, ensuring the mounting flange snaps into place around the rim of the ear cup. Worn earpads that no longer provide a good connection to the head should be replaced with new ones, which can be sourced from authorized dealers or directly from HIFIMAN. It is important to note that the internal drivers do not require maintenance, and any attempt to remove or modify them will void the product's warranty. The HE400se is a precision audio instrument, and unauthorized tampering can lead to damage and loss of warranty coverage.
General| Driver Type | Planar Magnetic |
|---|---|
| Impedance | 25 Ohms |
| Sensitivity | 91 dB |
| Frequency Response | 20 Hz - 20 kHz |
| Weight | 370g |
| Cable Length | 1.5 m |
| Type | Open-Back |
| Connector | 3.5 mm |
| Ear Pad Material | Velour |
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