A class D audio amplifier comprising: - a first output driver comprising an output node (V A) connectable to a loudspeaker load to supply a load signal thereto, - said first output driver comprising an upper leg (Leg A) coupled between a first DC supply voltage (V S) and the output node (V A) and a lower leg (Leg B) coupled between the output node(Leg A) and a second DC supply voltage, - the upper leg comprising a first semiconductor switch and a second semiconductor switch coupled in series and controlled by first and second switch control terminals, respectively, - the lower leg comprising a third semiconductor switch and a fourth semiconductor switch coupled in series and controlled by third and fourth switch control terminals, respectively; - a controller adapted to receive an audio input signal and derive first, second, third and fourth pulse width or pulse density modulated control signals therefrom, - the controller being configured to apply the first, second, third and fourth pulse width or pulse density modulated control signals to the first, second, third and fourth switch control terminals, respectively; - a first DC voltage source configured to set a first predetermined DC voltage difference between a first node, located between the first and second semiconductor switches, and a second node, located between the third and fourth semiconductor switches, wherein the first, second, third and fourth pulse width modulated control signals are configured to, in a first state, connecting a first terminal of the DC voltage source to the first DC supply voltage through the first semiconductor switch and connecting a second terminal of the DC voltage source to the output node through the third semiconductor switch, and in a second state connecting the second terminal of the DC voltage source to the second DC supply voltage through the fourth semiconductor switch and connecting the first terminal of the DC voltage source to the output node through the second semiconductor switch. - a first output driver comprising an output node (V A) connectable to a loudspeaker load to supply a load signal thereto, - said first output driver comprising an upper leg (Leg A) coupled between a first DC supply voltage (V S) and the output node (V A) and a lower leg (Leg B) coupled between the output node(Leg A) and a second DC supply voltage, - the upper leg comprising a first semiconductor switch and a second semiconductor switch coupled in series and controlled by first and second switch control terminals, respectively, - the lower leg comprising a third semiconductor switch and a fourth semiconductor switch coupled in series and controlled by third and fourth switch control terminals, respectively; - a controller adapted to receive an audio input signal and derive first, second, third and fourth pulse width or pulse density modulated control signals therefrom, - the controller being configured to apply the first, second, third and fourth pulse width or pulse density modulated control signals to the first, second, third and fourth switch control terminals, respectively; - a first DC voltage source configured to set a first predetermined DC voltage difference between a first node, located between the first and second semiconductor switches, and a second node, located between the third and fourth semiconductor switches,