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'''Class XD''' ('''crossover displacement''') is a proprietary and patented<ref>{{cite web|title=GB2424137 - Amplifier|url=https://www.ipo.gov.uk/p-ipsum/Case/ApplicationNumber/GB0505024.0|website=ipo.gov.uk|publisher=Ipsum}}</ref> amplifier technology developed in-house by [[Cambridge Audio]].
First appearing in 2006 in the Azur 840A integrated amplifier, the Crossover Displacement design sought to combine the performance of a traditional [[Class A amplifier|Class A]] design with the efficiency of [[Class B amplifier|Class B]] but without the linearity and distortion limitations of [[Class ab amplifiers|Class AB]].
In Class A amplification the output [[Transistor|transistors]] are modulated by the audio signal to turn more or less ‘on’ but never actually turn off. However, in Class B the output transistors actually turn off at some point as the output is passed from one transistor to another.<ref>{{cite web|title=Class XD Explained|url=https://www.cambridgeaudio.com/blog/class-xd-explained|website=Cambridge Audio}}</ref><ref>{{cite web|title=Class XD Optimum Sound Quality|url=https://www.cambridgeaudio.com/technology/class-xd|website=Cambridge Audio}}</ref>
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