Sennheiser HD 560S

The HD 560S is an open-back, over-ear headphone with a dynamic driver designed for analytical listening. It features a new 120-ohm transducer with a polymer-blend membrane and angled driver alignment aimed at recreating a wide soundstage.
| Frequency response | 6 Hz – 38 kHz |
| Sensitivity | 110 dB |
| Impedance | 120 Ω |
| Weight | 280 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 · 8.3 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 120 Ω — not a listening test. DAC/amps on the shelf →
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