Audio Database

The

DIATONE 2S-305 47,000yen(one set, 1958 release)
56,000yen(one setaround the 1968 time)
250,000yen(one set, October 1, 1977 -)
350,000yen(one set, around the 1984 time)

Description
 
It is the speaker system which spent 2S-660 to three announced in 1955 years, was improved, and was born.
It completed by joint research with the NHK technical research center.

"2S-305" is a specification name of "R305 for sound quality surveillance" specified in dozens of years "BTS-6131", and was adopted as an object for a standard play at the overseas broadcasting station, and a sound special maker and a sound research institute including the domestic broadcasting station.
Moreover, it was performed by the manual labor by the craftsman in whom all the processes in which it resulted in manufacture of the enclosure, an assembly of parts, and attachment became skillful in order to complete as a system each part made from high technical accuracy.

The corn type unit PW-125 type which had established reputation in the Woofer was adopted, and the TW-25 type is adopted as a tweeter.
By the enclosure of very simple network and bass-reflex structure, linearity and a dynamic range are large and has realized little distorted play.

The enclosure pastes up one thin strip [ one ] of a hippo and lauan, gives roundness to the outside corner and is designed.
While this was based on sound diffraction phenomena, the influence on - upper register was prevented, and it has succeeded in raising mechanical intensity.

The vibration system of PW-125 which is a speaker for low-pitched sound is a mechanical filter which a high region decreases with the crossover frequency of 1500Hz or more, and even if a network is not used for it, it has prevented radiation of unnecessary loud sound.
Moreover, TW-25 of the speaker for loud sounds used iron and the cobalt alloy which is a small tweeter with an effective oscillating radius of 2cm, and is supposed that it has the saturation magnetic flux of the higher one in a magnetic circuit also in a magnetic material, and has realized high promotion of efficiency.

The survey data in the anechoic room was attached to every set.

It was also 600 ohms 2S-305C for wall tapestries (gray), and with the matching transformer.


Rating of a mode
System 2 ways, 2 speaker bass-reflex system, and a floor type
Composition, such as a unit For low-pass: 30cm corn type (PW-125)
For high regions: 5cm corn type (TW-25)
network: -- H.P. -170 type highpass filter
Play frequency band 50Hz - 15000Hz
Input impedance 8ohms
Crossover frequency 1500Hz
Rated input 20W
The maximum input 60W
Output sound pressure level 96dB/W
Dimensions Width 650x height 880x depth of 445mm
Weight 45kg
Option Exclusive caster MC-1380A (30,000yen)