Nakamichi HP-40SM
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| Design: | Invoices |
| Description: | Design: on-ear, device type: wired headphones, design features: neodymium magnets, plug connector: mini jack 3.5 mm |
| Additional Information: | Cable connection: bilateral |
| Plug connector: | mini jack 3.5 mm |
| Impedance: | 32 ohm |
| Sensitivity: | 120 dB |
| Design features: | Neodymium magnets |
| Device type: | Wired headphones |
| Mount type: | Headband |
| Maximum playback frequency: | 15000 Hz |
| Minimum repeatable frequency: | 20 Hz |
| Technology: | Dynamic |
| Membrane diameter: | 40 mm |