Sennheiser HD 620S
The HD 620S is a closed-back over-ear headphone featuring reference-grade 42 mm angled transducers with 38 mm diaphragm and a 150-ohm aluminum voice coil. Its design includes steel-reinforced ear cup covers and headband sliders, artificial leather ear pads with internal venting, and a detachable 1.8 m cable with 3.5 mm jack.
| Frequency response | 6 Hz – 30 kHz |
| Sensitivity | 110 dB/V RMS |
| Impedance | 150 Ω |
| Driver | 42 mm |
| Weight | 670 g |
As stated by the manufacturer — not community data.
A dongle is enough
A phone's own output runs out early; a small USB DAC/amp gives it full level and headroom.
| Needs, for 110 dB peaks | 1.0 V · 6.7 mW |
| Phone or laptop (≈0.70 V, 20 mW) | Runs short |
| Dongle DAC/amp (≈2.0 V, 120 mW) | Enough |
Worked out from the stated 110 dB/V and 150 Ω — not a listening test. DAC/amps on the shelf →
Three words is enough to start the page — warm or bright, lean or full, smooth or energetic.
Sign in to say what you heardOwners and listeners rate. Everyone else reads — which is what keeps these numbers worth reading.
