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Black closed-back over-ear headphones with padded headband and leatherette ear cups, 3.5 mm plug

Sennheiser

Sennheiser HD620S closed-back headphone 150 ohm 42 mm driver 326 g

SKU CH-TQWH-0A7DZ

Closed-back dynamic headphones with 42 mm drivers, 150 ohm impedance and a 1.8 m cable

  • ColorBlack
  • Closed-back design isolates sound for focused listening
  • 42 mm dynamic driver with 38 mm diaphragm delivers detailed audio
  • 150 ohm impedance suits dedicated headphone amplifiers
  • 326 g lightweight build with artificial leather pads for comfort
  • 8 m cable includes 3.5 mm plug and 6.3 mm adapter

Sennheiser HD620S Closed-Back Headphones

The Sennheiser HD620S is a wired, over-ear headphone built on a closed-back acoustic principle. It uses a single 42 mm dynamic driver with a 38 mm diaphragm and presents a 150 ohm impedance. The package includes a 1.8 m cable with a 3.5 mm plug and a 3.5 to 6.3 mm adapter.

150 Ohm Impedance Requires Adequate Drive

The 150 ohm impedance is the key specification that determines compatibility with your source. It demands sufficient voltage swing to reach the rated 105 dB SPL at 1 kHz with low distortion below 0.05%. Portable devices with low-voltage outputs may not deliver the necessary level or control.

Suits Listeners Wanting Wired Closed-Back Isolation

These headphones suit listeners who want a wired, closed-back design for isolation and a neutral transducer. They are not for users who need wireless connectivity, active noise cancellation, an inline microphone, or a low-impedance model that runs loudly from a smartphone alone.

Highlights

  • Closed-back design isolates sound for focused listening
  • 42 mm dynamic driver with 38 mm diaphragm delivers detailed audio
  • 150 ohm impedance suits dedicated headphone amplifiers
  • 326 g lightweight build with artificial leather pads for comfort
  • 8 m cable includes 3.5 mm plug and 6.3 mm adapter

Specifications

ColorBlack

Questions about this item

How does the 150 ohm impedance affect volume and amplifier choice?

At 150 ohms the headphones need more voltage than low-impedance models to reach the same loudness, so a dedicated headphone amp or audio interface will usually drive them cleaner than a phone or laptop jack.

What does the 3.5 mm jack with 6.3 mm adapter actually connect to?

The 1.8 m cable ends in a 3.5 mm plug and the box includes a screw-on 6.3 mm adapter, letting you plug straight into portable devices, audio interfaces, or studio gear with quarter-inch sockets.

Will the 42 mm driver and 326 g weight fit comfortably on a small head?

The over-ear cups use 42 mm dynamic drivers with 38 mm diaphragms and artificial-leather pads; at 326 g without cable the clamping force is moderate, so most users find them comfortable for long sessions.

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