||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)
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.
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
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
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.
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.
||2 ways, 2 speaker bass-reflex system, and a
|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
|Play frequency band
||50Hz - 15000Hz
|The maximum input
|Output sound pressure level
||Width 650x height 880x depth of 445mm
||Exclusive caster MC-1380A (30,000yen)