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.
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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