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Home >> Land Rover >> 2007 >> LR3 HSE >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Audio Unit >> Audio Unit >> Description And Operation >> Audio System >> Integrated Head Unit >> Automatic Volume Control-AVC

Automatic Volume Control-AVC

The AVC feature is designed to adjust output volume to compensate for the rising level noise of the vehicle as the vehicle travels faster.

There are 10 settings for AVC, where 0 = off, 1 is the lowest setting (minimum volume change with speed and 9 the maximum).

The vehicle speed signal is used to enable the IHU to calculate the volume adjustment required. The vehicle speed signal is received over the CAN from the anti-lock brake system (ABS) control module. The signal is an average of the four wheel speed sensor signals.

Control of the AVC is carried out by the audio amplifier.

Should an invalid speed signal be received the AVC will not alter the output volume.

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