VICTOR/JVC HP-D30
¥ 8,500 (around 1976)
Commentary
DynaFlat Series lightweight headphones.
It uses a full-surface drive dynaflat system that takes advantage of the advantages of both the dynamic and condenser types, and realizes low distortion rate and wide-band reproduction.
The principle of operation of the dyna-flat type is the same as that of the dynamic type. According to the Fleming's left-hand rule, tens of ferrite magnets are arranged side by side on a magnetic short-circuit plate. Moreover, the diaphragm itself is made of an extremely thin, precision aluminum pattern conductor using photographic technology. This structure ensures that the diaphragm is driven all over the surface with the same phase regardless of the magnitude of the signal.
The dyna-flat type is easy to use because it does not require a dynamic transformer, while the capacitor-type has broadband, low distortion, and flat frequency characteristics.
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Model Rating
| Type | Headphone |
| Format | Dyna-flat type |
| Playback frequency band | 20 Hz to 20 kHz |
| Impedance | 32 Ω |
| Output sound pressure level | 92dB(1mW) |
| Allowable input | 100mW |
| Weight | 240g (cord not included) |