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The Q property of the BiquadFilterNode interface Is a k-rate AudioParam, a double representing a Q factor, or quality factor.

It is a dimensionless value with a default value of 1 and a nominal range of 0.0001 to 1000.


var audioCtx = new AudioContext();
var biquadFilter = audioCtx.createBiquadFilter();
biquadfilter.Q.value = 100;

Note: Though the AudioParam returned is read-only, the value it represents is not.


An AudioParam.


The following example shows basic usage of an AudioContext to create a Biquad filter node. For a complete working example, check out our voice-change-o-matic demo (look at the source code too).

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

//set up the different audio nodes we will use for the app
var analyser = audioCtx.createAnalyser();
var distortion = audioCtx.createWaveShaper();
var gainNode = audioCtx.createGain();
var biquadFilter = audioCtx.createBiquadFilter();
var convolver = audioCtx.createConvolver();

// connect the nodes together

source = audioCtx.createMediaStreamSource(stream);

// Manipulate the Biquad filter

biquadFilter.type = "lowshelf";
biquadFilter.frequency.value = 1000;
biquadFilter.gain.value = 25;

biquadFilter.type = "peaking";
biquadFilter.frequency.value = 1000;
biquadFilter.Q.value = 100;
biquadFilter.gain.value = 25;


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support14 Yes25 No156
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes14 Yes2615 ? ?

See also

Document Tags and Contributors

 Contributors to this page: SphinxKnight, fscholz, erikadoyle, chrisdavidmills
 Last updated by: SphinxKnight,