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Ellipsoidal Reflector Spotlight - ERS is an acronym standing for Ellipsoidal Reflector Spotlight. These are sometimes known by their brand names, especially Leko, short for Lekolite, the name given to them by their inventors, Joseph L. Used . evy and Edward Kook. ETC's Source Four has become a very popular ERS throughout the industry, and some people use the term Source Four to refer to spotlights in general. They come in many for. Used . ms, and are the most numerous and important instrument type in use. The flexibility of the ERS allows them to fulfill the bulk of the lighting roles in the theatre, from area lighting to close specials, from l...

Zoetrope - Early device for creating the illusion of continuous motion. A sequence of still pictures was viewed rapidly through slits in a rotating drum so that the images appeared to merge. . Used . . Used . ...

Compression and Dynamics - Compression is the reduction of the dynamic range of a sound to avoid unintentional changes and increases in the amplitude. Compression is generally used to make an audio signal sound louder without i. Used . ncreasing its peak amplitude. By compressing or limiting the peak signals, it becomes possible to increase the overall volume of the signal without exceeding the dynamic limits of a device or. Used . medium. This causes quiet sounds to become louder, while louder sounds remain unchanged....

White Noise - A random audio signal with a flat power spectral density that contains noise at the same level at all frequencies. The signal's spectral density has equal power in any band and at any frequency in a . Used . given bandwidth. White noise is similar to white light which contains all frequencies. White noise is often used in the field of architectural acoustics to mask distracting or undesirable n. Used . oises in interior spaces....

Lighting Control Console - Lighting control consoles (also called lighting boards or lighting desks) are electronic devices used in theatrical lighting design to control multiple lights at once. They are used throughout the ent. Used . ertainment industry and are normally placed at the FOH position or in a control booth. All lighting control consoles can control dimmers which, in turn, control the brightness of the lights. . Used . Many modern consoles can also control intelligent lights (lights that can move and change colors), fog machines and hazers, and other special effects devices. Consoles communicate with the dimmers and other de...