Spectra

A plural of spectrum. In pro audio use, spectra is the distribution of frequency of a sound signal, especially the distribution of sound energy, arranged in order of frequency wavelengths. Used to help discover if and where frequency-related problems are occurring, spectral analysis of audio can be helpful in determining where frequencies are crowded (overlapping of many similar frequencies, which can cause frequency masking), or where they are lacking (prevalence of frequencies in which a recording might be deficient).