Use of RIAA Equalization
Because the RIAA equalization standard has been in use internationally for phonograph records since 1953 and is based on recording practices used for many years by RCA Victor a dominant record producer, the electronics for this is as readily available as record players are. For vintage recordings the Esoteric Sound Re-Equalizer can readily be connected as a standard item to the record playback equipment. The Re-Equalizer is used to modify RIAA. Then, depending on the vintage and label of the 78 rpm record, the appropriate equalizer bass turnover and treble rolloff settings can be easily looked up in a reference guide.
Read more about this topic: Audio Engineering Society, Coarse-groove Calibration Discs