Audio Database


a price -- unknown

It is a speaker system of the world highest class those days which was completed by joint research with the NHK synthesis technical research center in 1966 (Showa 41).

By adopting loud sound, inside sound, low-pitched sound, and the multi-amplifier system equipped with amplifier for every zone, it excels in the frequency response of a crossover and intermodulation distortion is very small.
Moreover, since large output power of sound of distortion is also very small, a high fidelity play in a large music hall can be performed.

a speaker unit -- using [ a 40cm large caliber speaker ] a speaker with an aperture of 5cm for a speaker with an aperture of 12cm four pieces for three pieces and loud sounds two pieces and for inside sound for low-pitched sound, the engine performance and technology concentrate the essence of the Mitsubishi Diatone speaker group of technical experts of those days.

Since it is developed for stereos, it is symmetrical unit arrangement.

Four TW-25 types per one of the two which all the units used are for a monitor and were used for that 2S-305 are used,As [ the unit of inside sound and low-pitched sound / use / only for AS-4001 and AS-4021 / unit ] (a Woofer unit differs in impedance strictly)

Volume control, distribution, etc. are performed by the MA-031 type distribution amplifier, and structure is amplified in each compass of the "Low-Mid-High" by the MA-401 type.

* It is said that AS-4001 and AS-4021 were delivered to the NHK technical research center, NHK Broadcasting Center, Tokyo Festival Hall, Osaka College of Music, Musashino Academia Musicae, etc.

The tip of an input cord makes 21P3B of BTS-4101 a standard.

Rating of a mode
System 3 ways, 9 speakers and a division drive, a bass-reflex system and a floor type
Composition, such as a unit For low-pass: 40cm corn type (PW-4011) x2
For inside regions: 12cm corn type (PM-1201) x3
For high regions: 5cm corn type (TW-25) x4
amplifier: -- MA -401 type 40W(main amplifier) x3
MA-031 type (distribution amplifier) x1
Play frequency band 30Hz - 20000Hz
Input level -22dBm
Input impedance 600 ohms, 10kohm (balance)
Crossover frequency 300Hz, 3000Hz
Maximum-except-take-off sound pressure level 114dB/m
-less distorted maximum-except-take-off sound pressure level 112dB/m
Power source AC100V, 800VA
Dimensions Width 950x height 1750x depth of 535mm (only speaker system)
Weight About 400kg