Fosi Audio IM4 delivers exceptional HiFi performance with a premium 10mm N52 dual-magnet dynamic driver. It also features a beryllium-coated PU diaphragm for ultra-low distortion, rapid transients, and precise detail across the full 20Hz-20kHz range. High sensitivity and low impedance make them effortlessly drivable from portable/desktop DACs, DAPs, and laptops without needing extra amplification.

The neutral reference tuning provides controlled sub-bass, forward natural mids, and smooth extended treble, creating a holographic wide soundstage with precise imaging and zero fatigue. User will not feel any soreness in their ears even after long listening sessions. Semi-open back CNC-machined 6063 aluminum shells ensure ergonomic comfort, acoustic resonance and durability.

A detachable high-end 4-core 392-strand 5N OFC silver-plated copper cable (0.78mm 2-pin) minimizes signal loss for pure fidelity. Customize your sound signature with swappable aluminum/brass nozzles and included eartips (3x balanced, 3x vocal) for bass-boost, vocal-forward, or analytical profiles.