- In an audio system, a volume control which incorporates a circuit that boosts low frequencies when listening at low-volume settings. This compensates for the lower auditory response humans have under these circumstances, thus making the sound more natural. Such a control may also boost high frequencies. Also called loudness (2), or compensated volume control.
- A control, such as that of a TV or stereo amplifier, which varies loudness (1). Also called volume control.