Audio Post Production Knowledge Base

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Acetate Stock
Acetate stock was used as a base for motion picture film, sound film, and magnetic tape predominantly between the 1950s and the 1980s. Acetate stock replaced the flammable nitrate stock that had been the base for 35mm theatrical film during the first half century of the motion picture era. It is

7.1 Multi-channel Audio
7.1 refers to multi-channel audio intended to be monitored through eight channels: seven full frequency range (20Hz to 20KHz) channels and one frequency limited (below 120Hz) channel for the LFE (Low Frequency Effects), or Subwoofer track. 7.1 multi-channel audio has several theoretical channel

Quadrophonic Stereo
The term Quadrophonic, or Quadraphonic, either are correct, was coined in the early 1970s to describe a four-channel sound presentation used in the recording and broadcast industries. The speaker placement is frontLeft, frontRight, rearLeft and rearRight (fL,fR,rL,rR), with the listener sitting