Pioneer PM-100
¥ 36,000 (released in June 1967)
Commentary
A horn speaker unit exclusively for middle and high frequencies equipped with a fully split multi-seller horn.
The directivity is improved by the adoption of 15 completely divided horns (multi-cellar horn system).
By using a lightweight and rigid metal diaphragm for the diaphragm, transient characteristics are improved.
By using the horn as a load, the fluctuation of the voice coil impedance is minimized.
Aluminum die-cast is used for the material of the horn to reduce horn squeal (resonance sound of the horn itself).
Specially treated sound absorbing material is used in the construction of the unit, and aluminum wire is used in the voice coil to improve the overall characteristics while maintaining the balance of each characteristic.
The assembly structure adopts a disassembly method of three parts : unit, throat, and horn.
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Model Rating
| Type | Horn speaker |
| Voice coil impedance | 8 Ω |
| Cutoff frequency | 300Hz |
| Playback frequency band | 300 Hz to 6 kHz |
| Output sound pressure level | 112dB/W |
| Max Input | 60W |
| Nominal input | 40W |
| Total flux | 78,000maxwell |
| Magnetic flux density | 12,870gauss |
| Optimum operating frequency band | 500 Hz to 5 kHz |
| Horn aperture area | 83x83mmx15 Horn |
| Driver Unit Mounting Dimensions | Diameter : 1 3/8inch Pitch : 18 inch |
| External dimensions | Width 442x Height 268x Depth 615 mm |
| Weight | 8.5kg |