A class D audio amplifier comprising: - a first output driver and a second output driver comprising first and second output nodes (V A), (V B) connectable to respective inputs of a loudspeaker load to supply a load signal thereto, said first output driver comprising one or more semiconductor switches coupled between a first supply voltage (V S) and the first output node (V A), - one or more semiconductor switches coupled between the first output node and a second supply voltage, - one or more semiconductor switches coupled between the first output node (V A) and a third supply voltage (1/2 V S); said second output driver comprising one or more semiconductor switches coupled between the first supply voltage (V S) and the second output node (V B), - one or more semiconductor switches coupled between the second output node (V B) and the second supply voltage, - one or more semiconductor switches coupled between the second output node (V B) and the third supply voltage (1/2 V S); - wherein each of the one or more semiconductor switches comprises a switch control terminal adapted to control a state of the semiconductor switch to selectively place each semiconductor switch in its on-state or off-state; - a controller adapted to receive an audio input signal and derive a first set of modulated control signals (Vc1, Vc2, Vc2, Vc4) therefrom and apply these to respective switch control terminals of the first driver, - the controller being further adapted to derive a second set of modulated control signals (Vc5, Vc6, Vc7, Vc8), having a predetermined phase relationship to the first set of modulated control signals, and apply the second set of modulated control signals (Vc5, Vc6, Vc7, Vc8) to respective switch control terminals of the second driver, wherein the controller is configured to: - in a first operation mode, set a first predetermined phase relationship between the first and second sets of modulated control signals to generate a first multi-level load signal across the loudspeaker load, - in a second operation mode, set a second predetermined phase relationship between the first and second sets of modulated control signals to generate a second multi-level load signal across the loudspeaker load. - a first output driver and a second output driver comprising first and second output nodes (V A), (V B) connectable to respective inputs of a loudspeaker load to supply a load signal thereto, - one or more semiconductor switches coupled between the first output node and a second supply voltage, - one or more semiconductor switches coupled between the first output node (V A) and a third supply voltage (1/2 V S); - one or more semiconductor switches coupled between the second output node (V B) and the second supply voltage, - one or more semiconductor switches coupled between the second output node (V B) and the third supply voltage (1/2 V S); - wherein each of the one or more semiconductor switches comprises a switch control terminal adapted to control a state of the semiconductor switch to selectively place each semiconductor switch in its on-state or off-state; - a controller adapted to receive an audio input signal and derive a first set of modulated control signals (Vc1, Vc2, Vc2, Vc4) therefrom and apply these to respective switch control terminals of the first driver, - the controller being further adapted to derive a second set of modulated control signals (Vc5, Vc6, Vc7, Vc8), having a predetermined phase relationship to the first set of modulated control signals, and apply the second set of modulated control signals (Vc5, Vc6, Vc7, Vc8) to respective switch control terminals of the second driver, - in a first operation mode, set a first predetermined phase relationship between the first and second sets of modulated control signals to generate a first multi-level load signal across the loudspeaker load, - in a second operation mode, set a second predetermined phase relationship between the first and second sets of modulated control signals to generate a second multi-level load signal across the loudspeaker load.