The reduction read-only property of the DynamicsCompressorNode interface is a float representing the amount of gain reduction currently applied by the compressor to the signal.

Intended for metering purposes, it returns a value in dB, or 0 (no gain reduction) if no signal is fed into the DynamicsCompressorNode. The range of this value is between -20 and 0 (in dB).


var myReduction = compressorNodeInstance.reduction;


A float.


var audioCtx = new AudioContext();
var compressor = audioCtx.createDynamicsCompressor();
var myReduction = compressor.reduction;


Specification Status Comment
Web Audio API
The definition of 'reduction' in that specification.
Working Draft  

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 10.0webkit
(Yes) (unprefixed) [1]
(Yes) 25.0 (25.0)  No support 15.0webkit
22 (unprefixed) [1]
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? (Yes) (unprefixed) [1] (Yes) 26.0 1.2 ? ? [1] ? 33.0 [1]

[1] Before Chrome 52 and Opera 39, this was an AudioParam

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, erikadoyle, James.Farrell, jpmedley, fscholz, JesseTG
 Last updated by: chrisdavidmills,