Band Spacing
Equalizer band spacing describes the intervals between the centre frequencies of adjacent bands, commonly expressed as fractions of an octave.
An octave is a doubling of frequency. One-third-octave spacing places three intervals within that doubling, giving more closely spaced adjustment points than one-octave spacing over the same frequency range.
Band Spacing — Equalizer
On a graphic equalizer, the spacing helps show where the fixed controls sit across the audio band. Closer centres offer more adjustment points within a given range. Parametric bands instead allow their centre frequencies to move, so their spacing is variable rather than a fixed octave pattern.
Compare spacing together with total frequency coverage, band count and filter width. Spacing is the distance between centres; bandwidth describes how broadly each filter acts. They need not be identical. A unit combining graphic and parametric sections uses the graphic section's spacing here, and a band count alone does not establish the interval.