LUXMAN LX77 43,800yen(one set, the September, 1971 release)

The speaker system which adopted the ring-type tweeter which the Lux was original and did research and development in.

The high compliance free edge type unit of 30cm aperture is adopted as low-pass.
The long voice coil is adopted as this unit, and the nonlinear distorted occurrence in a bass region is suppressed. Moreover, it is designed cut unnecessary upper register mechanical.
A butterfly type damper made from an epoxy glass fiber laminate is adopted as a damper, and fizz neo plain rubber is used for the edge. The reflection which this generates from an edge was absorbed and the merit of a linearity is secured.

A 4cm dome shape unit is adopted as a mid range.
Rigid high hard duralumin is used for a diaphragm, and the splitting oscillation of the audio frequency band which checks the clearness of sound is suppressed.
The free edge type which uses the high fiber of a Young's modulus is used for an edge.

The ring-type unit which is 3.3cm which LUX developed is adopted as the high region.
With the ring diaphragm form original with a Lux which uses super-hard duralumin, the splitting oscillation in an audio frequency band is lost, and only the perfect inertia control span is used.
Moreover, the acoustic resistance thing closed between a magnetic gap and air chambers, and the flat sound pressure property has been acquired by controlling the vibration near fo.
The input-proof is strengthened with adopting a 2.5cm aluminum voice coil and the bobbin of super-hard duralumin.

Particle board is adopted as the enclosure. The top plate, the sole plate, and the side plate use a 25mm thing, and a 20mm thing is used for a front and rear.
The top layer serves as rosewood finish.
Moreover, the bond acetate fiber is used for an internal acoustic material.

The termination for multi-amplifier is carried. 

cheme	3 ways, 3 speakers, a sealing scheme, and a bookshelf type
Unit	For low-pass: 30cm cone type For mid ranges: 4cm dome shape For high regions: 3.3cm ring type
Frequency characteristic	30Hz - 22000Hz
The minimum resonance frequency	55Hz
Rated input	30W
The maximum input	60W
Impedance	8ohms
Cross over frequency	700Hz, 8000Hz (-18 dB/oct)
Level control	The object for Mid, for High: A constant impedance AS-6X type
Dimensions	Width 388x height 666x depth of 310mm
Weight	22.5kg