Sennheiser HD 620S - Closed-Back Over-Ear Audiophile Headphones, 42mm Dynamic Transducer, 150 Ohm - New

The Sennheiser HD 620S (P/N 700401) is a closed-back, around-ear wired audiophile headphone from the acclaimed HD 600 series. It is built around a custom-tuned 42 mm dynamic transducer with a 38 mm Duofol diaphragm made at Sennheiser's Tullamore, Ireland transducer plant, paired with a 150-ohm aluminum voice coil. Measured specifications include a 6 Hz to 30 kHz frequency response, 110 dB (1 kHz / 1 Vrms) sound pressure level, and THD <0.05% (1 kHz / 90 dB SPL). The HD 620S ships with a 1.8 m detachable cable terminated in a 3.5 mm stereo plug and an included 6.3 mm screw-on adapter, with Sennheiser also offering a separately-sold 4.4 mm balanced cable for balanced amp setups.

Sennheiser HD 620S - Key Features & Benefits

• Closed-Back HD 600 Series Audiophile Tuning: Closed-back design with steel-reinforced ear cup covers for passive isolation, carrying the HD 600 series tonal lineage in a sealed chassis — per Sennheiser, designed for distraction-free listening sessions
• 42 mm Dynamic Transducer, 38 mm Duofol Diaphragm: Custom-tuned 42 mm angled dynamic transducer with a 38 mm Duofol diaphragm made at Sennheiser's Tullamore, Ireland transducer plant, paired with an ultra-light 150-ohm aluminum voice coil
• Wide 6 Hz - 30 kHz Frequency Response: 150 Ω nominal impedance, 110 dB (1 kHz / 1 Vrms) sound pressure level, and THD <0.05% (1 kHz / 90 dB SPL) per Sennheiser specifications
• Lightweight, Long-Wear Build: Steel-reinforced headband sliders and ear cup covers, artificial leather earpads on a polyurethane base with internal venting, and an around-ear cup design for extended listening sessions
• Detachable 1.8 m Twist-Lock Cable — Balanced-Ready: Single-entry 1.8 m cable terminated in a 3.5 mm (1/8") stereo plug with an included screw-on 6.3 mm (1/4") adapter; Sennheiser also sells an optional 4.4 mm balanced cable separately for use with balanced amplifiers and DAPs

Sennheiser HD 620S - Technical Specifications

• Manufacturer: Sennheiser
• Article Number / MPN: HD 620S / 700401
• UPC: 810091272817
• Color: Black
• Transducer Principle: Dynamic, closed
• Transducer Size: 42 mm with 38 mm Duofol diaphragm
• Voice Coil: Ultra-light aluminum
• Nominal Impedance: 150 Ω
• Frequency Response: 6 Hz - 30 kHz
• Sound Pressure Level (SPL): 110 dB (1 kHz / 1 Vrms)
• Total Harmonic Distortion (THD): <0.05% (1 kHz / 90 dB SPL)
• Ear Coupling: Around-ear
• Ear Pad Material: Artificial leather on polyurethane base, with internal venting
• Cable Length: 1.8 m, detachable, single-entry twist-lock
• Plug: 3.5 mm (1/8") stereo • included screw-on 6.3 mm (1/4") adapter
• Optional Balanced Cable: 4.4 mm (sold separately)
• Storage Temperature: −15°C to 65°C
• Condition: New

Sennheiser HD 620S - Frequently Asked Questions (FAQ)

• Do I need a dedicated headphone amplifier?
  The HD 620S has a 150 Ω nominal impedance and 110 dB (1 kHz / 1 Vrms) SPL, so it can be driven from most laptops, DAPs, and DAC/amp dongles. A dedicated headphone amplifier is recommended for the best dynamics and headroom at higher listening levels.
• How is this different from the HD 600, HD 650, or HD 660S2?
  The HD 620S is a closed-back design built for passive isolation and private listening, while the HD 600, HD 650, and HD 660S2 are open-back headphones in the same HD 600 series. The HD 620S draws on the same audiophile lineage but in a sealed chassis tuned for isolation.
• What cable and adapter come with the HD 620S?
  The HD 620S includes a 1.8 m detachable twist-lock cable terminated in a 3.5 mm (1/8") stereo plug and an included screw-on 6.3 mm (1/4") adapter. Sennheiser also sells an optional 4.4 mm balanced cable separately for use with balanced amplifiers and digital audio players.

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