dbx was a noise-reduction system that was employed on a number of 12-inch LPs in the late 1970s and early 1980s..
The dbx system was premiered in 1973 and a promotional disc produced, but no record companies were interested. It wasn’t until 1979 that BSR, a UK producer of turntables, acquired the dbx company and persuaded several record companies to begin producing discs using dbx Type II encoding.
dbx used linear decibel compounding to compress the signal when recording, and expand it on playback. It meant that surface noise was almost completely eliminated, and the dynamic range of vinyl records could be greatly increased. In addition, dbx releases were made on heavy virgin vinyl and produced from the original master tapes. However, playing back dbx discs required a decoder, and without one playback sounded poor. This was one of the reasons it failed in the marketplace.
With a dbx encoder, users could also record onto tape with dbx noise reduction, and playback from dbx encoded tape recordings, but by this time, Dolby B was already widespread as a noise reduction system for tape.
It appears that less than 200 titles were made available, and no new releases appear to have been made after 1982.
Sources / Resources
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