DIATONE DS-21C

Commentary

This is a bookshelf speaker system in the first lineup of Diatone released in 1968.

For low range, it is equipped with PW 2015 which is a 20 cm cone type woofer.
This unit is designed to attenuate the high-at - 12 -12dB/oct. from the crossover frequency, so that no unwanted sound emission occurs.

For 5 cm cone type tweeter, TW-5014, is mounted for the high range.

The overall design, including the enclosure, makes it possible to use only one condenser for the 2-way network and realizes low distortion.

The enclosure uses a bass reflex system and is designed to enhance the bass effect when installed on a bookshelf or wall surface.
The exterior has a Eurasian cheek finish.

Model Rating

Method	2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type
Units used, etc.	For Low Band : 20 cm Cone Type (PW-2015) For High Range : 5 cm Cone Type (TW-5014) Network : 4 μ F NP capacitor
Nominal impedance	16 Ω
Playback frequency range	30 Hz to 20 kHz
Output sound pressure level	101dB/VA(50cm)
Crossover frequency	2kHz
Rated input	25W
External dimensions	Width 390x Height 550x Depth 295 mm
Weight	15kg
Specifications of the unit used
Model Name	PW-2015	TW-5014
Aperture	20cm	5cm
Nominal impedance	16 Ω	13 Ω
Playback frequency range	40 Hz to 2 kHz	2 kHz to 20 kHz
Output sound pressure level	101dB/VA	102dB/VA
Lowest resonance frequency	40Hz	2kHz
Effective air gap flux density	9,000gauss	11,000gauss
Total flux	150,000maxwell	38,000maxwell
Permanent magnet	MK-5-DG	MK-5S-DG