Even with the move from 78s to LPs and 45s, various standards were in use.īy 1955, the United States had adopted the RIAA standard for sound recording the rest of the world would eventually follow suit. For several decades, many equalization curves were in use, with individual record labels using different standards and even changing their standards from year to year. These adjustments between the encoding of sound on a record and the transformation it undergoes during playback are known as equalization. Soon they discovered that increasing the amplitude of higher frequencies on the disc and de-emphasizing them during playback had the effect of suppressing surface noise and preserving sounds that might otherwise be lost, such as sibilants. Instead of opting for wider grooves (which would have the undesirable effect of shortening playing time), engineers began to reduce the amplitude of low frequencies. The cutter that made the record would overcut and the grooves would run together. In 1925, when phonograph records began to be recorded electrically, sound engineers ran into a problem: if bass frequencies exceeded a certain volume, the grooves of a record would not be wide enough to contain them.
Appendix: Playing Records Through Audacity.Mono Switches for Horizontal-Cut and Vertical-Cut Records.Mono switches for both horizontally and vertically cut records are provided.
You can also use these filters to listen to raw transfers enjoyably. Playback may be done using any program, as the correction to equalization is done using the Equalizer APO system-wide equalizer (Windows required). This library of equalization curves allows you to listen to 78 rpm records with correct equalization in real time. Real-Time 78 rpm Equalization Curves for Equalizer APO
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