Infrequent Sound [sex.tex] technology: Victor BLA-E20 [JVC Nivico 5320], 1968, made in Japan

Link: audio-heritage

Price unknown at launch (released August 1968)
18,300 yen (one, around 1969)
¥ 19,400 (1 unit, around 1970)

The speaker system of the H.E series pursuing high efficiency (High Efficiency).

In order to increase the efficiency of the HE series, a special processing method must be used to ensure airtightness during the pulp disintegration stage, and the apparent density, Young's modulus, propagation loss, etc. are used for the speaker unit. We adopt a method that can be freely selected at the stage of Victor vacuum press after making according to the.

A 20 cm cone type woofer is installed in the low range, a 9 cm cone type squawker is installed in the mid range, and a 5cm cone type tweeter is installed in the high range.

In order to make an enclosure into a completely closed structure, the method of fixing the unit from the front by completely sealing and assembling the six ridges with adhesive is adopted.

This not only prevents air leakage, but also forms a duct for the thickness of the baffle when the unit is fixed from the inside, thus preventing the anterior chamber effect from occurring.

The level control is carried.

Specification
method: 3 ways, 3 speakers, a sealing system, and a bookshelf type
unit

For low-pass: 20cm cone type [label: Victor P.D.Speaker SK2196B 8Ohm 10W 893 13A]

For mid ranges: 9cm cone type [label: Victor Tweeter SK2128E 8Ohm 10W 89309]
For high regions: 5cm cone type [label: SK2131D 89323H 8Ohm 3W JVC Japan]

Impedance: 8Ω
Maximum input: 30W
Frequency characteristic: 37Hz-20000Hz
Output sound pressure level: 100dB / W
Crossover frequency: 5kHz, 10kHz (6dB / oct)
External dimensions: Width 330 x height 550 x depth of 250 mm

Weight: 9kg / 1 pcs