Sennheiser HD 600

The Sennheiser HD 600 is an open-back, circumaural wired headphone using a dynamic transducer with a 42mm driver and 300-ohm impedance. It is assembled in Ireland and ships with a detachable 3m cable terminating in a 3.5mm connector plus a 6.3mm adapter.
| Frequency response | 12 Hz – 40.5 kHz |
| Sensitivity | 97 dB (1 V) |
| Impedance | 300 Ω |
| Driver | 42 mm |
| Weight | 260 g |
As stated by the manufacturer — not community data.
Wants a headphone amp
A phone or a dongle will play it, but quietly and without headroom. Budget for a desktop amp or a powerful DAC/amp.
| Needs, for 110 dB peaks | 4.5 V · 67 mW |
| Phone or laptop (≈0.70 V, 20 mW) | Runs short |
| Dongle DAC/amp (≈2.0 V, 120 mW) | Runs short |
Worked out from the stated 97 dB/V and 300 Ω — not a listening test. DAC/amps on the shelf →
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