Audio Database

The

DIATONE DS-251
25,000yen(one set, the 1970 release)

Description
 
As the third phase of DS series, it is the speaker system put on the market in Showa 45.
It has the composition of having added the super tweeter to the speaker system of two ways as a super-high region, and became a best seller those days.

A 25cm corn type unit is adopted as low-pass.
The corn paper of a special press is adopted.

The 5cm corn type unit is adopted as the high region.
With the tweeter of acoustic load type which stuffed the sound-absorbing material into the quality of air of the diaphragm rear, since the minimum resonance frequency is as low as 600Hz, it has succeeded in smoothing a crossover of a Woofer.

A 3cm metal corn unit is adopted as the super-high region.
The aluminum alloy molding board was made the diaphragm and the suspension, and they take it.

The enclosure adopts the acoustic air suspension system which stuffed a 300g sound-absorbing material into the sealing cabinet with a powerful junction structure, and the transient and distortion in a low-pitched sound region are improved.

The Attenuator of the step type which can change to a three-stage at a 3dB step from 2000Hz to 25000Hz is carried.
It is also possible to change a super tweeter to ON/OFF by this Attenuator.

Internal

Rating of a mode
System 3 ways and 3 speaker acoustic air suspension system
- Book shelf type
Use unit etc. For low-pass: 25cm corn type
For high regions: 5cm corn type
For high [ super-] regions: 3cm corn type
Rated impedance 8ohms
Play frequency band 40Hz - 25000Hz
Output sound pressure level 91dB/W
Crossover frequency 2000Hz, 10000Hz
Level control Three positions
The maximum input 40W
Dimensions Width 315x height 525x depth of 215mm
Weight 10kg