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Dbx (noise reduction)
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==dbx with pro reel tape recorders, as well as other professional/commercial audio production and reproduction== The dbx K9 noise reduction card was designed to fit into the pro dolby-A series A-361 frames, already in wide use in pro reel-to-reel recording studios of the time. The full designation of the card is K9-22, which is a dog vs. cat joke. The K9-22 is pin and form-factor compatible with the Dolby card designated and colloquially known as Cat. 22 (K9 is pronounced "canine"). The dbx 192 was an elegant design made especially for the Nagra IV-Stereo recorder. It had a single push-button for record/playback encode/decode and was integrated directly into the Nagra's internal signal path. It drew power from the Nagra supply.
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