Simple Explanation

A type of equalizer that boosts or cuts frequencies above or below a specific point, creating a flat response that either rises or falls after a certain frequency.

Concise Technical Definition

Shelving is a type of equalizer circuit used to boost or cut frequencies either above or below a specified frequency. This is different from typical equalizers, which affect frequencies symmetrically around a center frequency. Shelving is often used to shape the on-axis output of complementary drivers (like woofers, midranges, and tweeters) to achieve the desired frequency response. Shelving is commonly applied to tone controls (bass and treble) to adjust the low and high frequencies, creating a “shelf” effect where the response is flat at the chosen frequency and either rises or falls above or below it.

Layman-Friendly Analogy

Imagine adjusting the bass or treble on your stereo. If you boost the bass, the sound at lower frequencies increases while everything else stays the same. Shelving works the same way—it raises or lowers the sound above or below a certain point without affecting the rest of the sound.

Industry Usage Summary

Shelving is commonly used in equalizers to adjust the overall tone of an audio system, particularly in bass and treble controls. It allows engineers to shape the frequency response of speakers or sound systems by adjusting the low and high-frequency output without affecting the midrange. Shelving filters are found in many types of audio equipment, from basic home audio systems to professional sound reinforcement setups, and are especially useful for compensating for speaker or room acoustics. They are often used to achieve a desired tonal balance without complex filtering.

Engineering Shortcut

A filter used to boost or cut frequencies above or below a specified point, creating a flat response beyond that frequency.

Full Technical Explanation

Shelving refers to an equalizer circuit that boosts or cuts frequencies above or below a specific point, rather than affecting both sides of a central frequency, as typical EQs do. The term is often used to describe a frequency response with a flat end-band shape, either at the low or high end, that is modified by boosting or cutting the signal beyond a set frequency. Shelving filters are used to shape the frequency response of drivers (woofers, midranges, tweeters) in order to achieve the desired tonal balance. In practice, this is commonly applied in bass and treble tone control settings on audio equipment, where the low and high frequencies are adjusted independently. This technique is especially useful in simplifying the adjustment of overall frequency response while maintaining a smooth transition at the cutoff points.