Neumann NDH 30

The NDH 30 is a circumaural, open-back studio headphone with 38 mm dynamic transducers, a foldable headband and a detachable cloth-covered cable. It is aimed at editing, mixing and mastering and is designed to be used alongside Neumann KH-series monitors calibrated with MA 1.
| Frequency response | 12 Hz – 34 kHz |
| Sensitivity | 104 dB SPL/Vrms |
| Impedance | 120 Ω |
| Power handling | 1 W |
| THD | 0.03% |
| Driver | 38 mm |
| Weight | 352 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 | 2.0 V · 33 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 104 dB/V and 120 Ω — not a listening test. DAC/amps on the shelf →
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