This page does not review anything Neumann makes. It counts one thing: how much of what this database says about their products came out of their own documents, and how much had to be worked out or left blank.
| Model | Impedance | Sensitivity | Source of the figure |
|---|---|---|---|
| NDH 20 | 150 Ω | 105.8 dB/mW | Converted from per volt |
| NDH 30 | 120 Ω | 94.8 dB/mW | Converted from per volt |
Impedance is almost always printed. Sensitivity is the one that goes wrong, because a decibel figure means two very different things depending on whether it is per milliwatt or per volt — about five decibels apart at 300 Ω and eighteen at 16 Ω. The conversion is here.