The HIFIMAN HE400se is an open-back planar magnetic headphone that has redefined what is possible at the budget end of the planar magnetic market, delivering the speed, detail, and low distortion of planar technology at a price previously reserved for entry-level dynamic headphones. It features a full-size planar magnetic driver with a thin diaphragm and stealth magnets derived from HIFIMAN's more expensive designs, producing a clean, detailed sound with surprisingly good bass extension, a transparent midrange, and an open, airy treble. The planar driver delivers noticeably faster transients and lower distortion than comparably priced dynamic headphones, particularly evident in the bass region where the tight, controlled low end avoids the bloat and slow decay that budget dynamic drivers often exhibit. The open-back design creates a natural soundstage with good width and imaging, providing a convincing spatial presentation that enhances the listening experience for music and multimedia alike. At 25 ohms, the HE400se is fairly easy to drive from most sources, though its lower sensitivity means it benefits from an audio interface or amplifier with adequate voltage swing. The headband uses a simple suspension design, and the fabric earpads are reasonably comfortable. Build quality is functional with lightweight plastic construction. These headphones are an outstanding value for budget-conscious audiophiles and music producers entering the planar magnetic world. The lightweight plastic build feels less premium than the price might suggest, and long-term durability is a common concern among owners.

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