Driver / Design: Planar Magnetic / Open-back Planar Magnetic / Open-back Planar Magnetic / Open-back Planar Magnetic / Open-back

Audio Profile: The HE-35X improves upon the HE-350's frequency response, and balances the treble for a smoother overall sound. The sound is smooth, engaging, and even across the frequency range, with airy, sparkly highs and the Planar bass slam that HIFIMAN is known for. The sound is smooth, engaging, and even across the frequency range, with airy, sparkly highs and the Planar bass slam that HIFIMAN is known for. The sound is airy and spacious, with a transporting level of detail.

Impedance / Sensitivity: 19 ohms / 98 dB 35 ohms / 93 dB 35 ohms / 93 dB 20 ohms / 93 dB

Frequency Response: 20 Hz - 20 kHz 20 Hz - 35 kHz 20 Hz - 35 kHz 8 Hz - 50 kHz

Cable: 4.9 ft (1.5 m), removable 4.9 ft (1.5 m), removable 4.9 ft (1.5 m), removable 5.5 ft (1.7 m), removable

Plug: ⅛ in (3.5 mm) with ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter included ⅛ in (3.5 mm) with ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter included ⅛ in (3.5 mm) with ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter included ⅛ in (3.5 mm)

Weight: 13.6 oz (385 g) 13.1 oz (370 g) 13.1 oz (370 g) 14.8 oz (420 g)

Included: ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter ⅛ in (3.5 mm) to ¼ in (6.35 mm) adapter