DIATONE DS-31C
¥ 44,000 (1 unit, released in 1968)
Commentary
This is a floor-type speaker system in the first lineup of the Diatone series.
For the low range, it is equipped with a 20 cm cone type woofer PW 2015 and a 30 cm cone type woofer PW 3012.
This increases efficiency and reduces distortion in the mid-pitch valley and near the upper limit frequency, which are common in cone-type speakers.
For 5 cm cone type tweeters, TW-23, are mounted for the high range.
The overall design, including the cabinet, simplifies the network.
The high range of the woofer is designed to attenuate at -12dB/oct. from the crossover frequency without a network.
The enclosure is hermetically sealed and has a Eurasian cheek finish on the exterior.
Model Rating
Method | 2-Way, 4-Speaker, Sealed Type, Floor Type | ||
Units used, etc. | For Low Band : 30 cm Cone Type (PW-3012) 20 cm Cone Type (PW-2015) For High Range : 5 cm Cone Type (TW-23) x2 Network : 6 μ F NP capacitor |
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Nominal impedance | 8 Ω | ||
Playback frequency band | 30 Hz to 20 kHz | ||
Output sound pressure level | 104dB/VA(50cm) | ||
Crossover frequency | 2kHz | ||
Max Input | 40W | ||
External dimensions | Width 580x Height 860x Depth 310 mm | ||
Weight | 30kg | ||
Specifications of the unit used | |||
Model Name | PW-3012 | PW-2015 | TW-23 |
Aperture | 30cm | 20cM | 5cm |
Nominal impedance | 16 Ω | 16 Ω | 13 Ω |
Playback frequency range | 40 Hz to 2 kHz | 40 Hz to 2 kHz | 2 kHz to 20 kHz |
Output sound pressure level | 101dB/VA | 101dB/VA | 98dB/VA |
Lowest resonance frequency | 40Hz | 40Hz | 2kHz |
Effective air gap flux density | 9,000gauss | 9,000gauss | 10,000gauss |
Total flux | 150,000maxwell | 150,000maxwell | 38,000maxwell |
Permanent magnet | MK-5-DG | MK-5-DG | MK-5S-DG |