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All-Purpose Sound Reproduction

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in70mm.com
The 70mm Newsletter
Written by: Showmen’s Trade Review, October 15, 1955 Date: 01.07.2008
The Altec developed Switching Relay Equalizer rack, permitting knob-control switching from TODD-AO, to Cinema-Scope 4-track, to Perspecta, to optical print sound tracks, is shown at right. Above, Fred Pfeiff, of TODD-AO, is seen operating the relay switch at front of the Altec panel.

Climaxing numerous technical contributions its engineering staff has made to the sound phases of the TODD-AO system, Altec Service Corporation last week put into production its Switching Relay-Equalizer which provides compatibility with all existing sound systems. The device allows the projectionist to select the sound operation for TODD-AO, CinemaScope 4-track magnetic, Perspecta and standard optical prints. The Altec panel provides individual equalization and level balancing controls for 20 magnetic tracks. On a two-projector installation, the facilities allow setting the six-TODD-AO channels on each projector for dentical qualit y; likewise the four CinemaScope channels on each machine.
 
More in 70mm reading:

Todd-AO
The Todd-AO Projector

Showmen’s Trade Review, October 15, 1955:
Oklahoma! in Todd-AO
Todd-AO
Magna Theatres
Todd-AO Corporation
Philips Collaborated On Projector Design
Todd-AO Projection and Sound
Six track recording equipment
All-Purpose Sound Reproduction
Rodgers & Hammerstein II
Six track recording equipment

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Updated 22-12-16