The HE400se uses planar magnetic drivers with HiFiMAN's stealth magnets and a wide, holographic soundstage; its fast planar transients and neutral-to-slightly-cool tuning deliver detailed mids and imaging but require a decent amp to unlock dynamics. Strong technical resolution and imaging contrast with a stiff, microphonic stock cable, exposed driver internals, and comfort/build caveats.
For listeners wanting planar speed, wide soundstage, and neutral, detailed mids who can drive them with a proper amp; avoid if you need rugged build, removable shielding, or prefer plug-and-play ease.
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