Audio Engineering Society, Coarse-groove Calibration Discs - Other Equipment

Other Equipment

Another approach to obtaining the right phonograph record equalization settings for transferring vintage recordings to digital media is to use the Chronologic Equalizer in the Souvenir Vintage Sound Processor – MK-2 made by K-A-B Electronics.

Equalizer Setting
AC: Acoustic recordings
AE: Early electric recordings; Victor (some 1925), Columbia (1925), and most European to 1955
E3: Recordings with a 300 Hz turnover; Columbia (1925-1938), and FRR to 1955
E5: Recordings with a 500 Hz turnover; Victor (most 1925-1952)
E7: Recordings with a 700 Hz turnover (some NBC Orthacoustic transcriptions)
CO: Columbia 78 curve (1938 to 1955)
TR: Transcriptions (NAB)
MO: RIAA equalization

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