A multi-level class D audio power amplifier (300, 400, 500, 600, 800) for supplying an N-level drive signal to a loudspeaker, comprising: - a first output driver (340,440) comprising: at least 2 ∗ (N-1) controllable first semiconductor switches (QaO, Qa1, Qa2, Qa3) coupled in series between a first DC supply rail (Pvdd) and a second DC supply rail, wherein control terminals of the at least 2 ∗ (N-1) controllable first semiconductor switches are connectable to respective ones of at least 2 ∗ (N-1) modulated control signals, - 2 ∗ (N-2) intermediate nodes connecting the series connected 2 ∗ (N-1) controllable first semiconductor switches, - a driver output node or terminal arranged at a midpoint of the series connected 2 ∗ (N-1) first controllable semiconductor switches (QaO, Qa1, Qa2, Qa3) and connectable to a first input of the loudspeaker; - (N-2) DC input voltage nodes for receipt of (N-2) DC input voltages, - a switching matrix comprising a plurality of controllable second semiconductor switches (Qa4,Qa5); the switching matrix comprising at least (N-2) switch inputs, coupled to respective ones of the (N-2) DC input voltage nodes, and at least 2 ∗ (N-2) switch outputs coupled to respective ones of the 2 ∗ (N-2) intermediate nodes of the first output driver; and - a switching matrix control circuit configured to: sequentially connect and disconnect each of the (N-2) DC input voltages to a predetermined set of nodes of the 2 ∗ (N-2) intermediate nodes of the first output driver (340,440) via the switching matrix in accordance with one or more of the 2 ∗ (N-1) pulse width modulated control signals of the first output driver (340,440); wherein each of the plurality of controllable first and second semiconductor switches is a power transistor; N being a positive integer larger than or equal to 3. - a first output driver (340,440) comprising: at least 2 ∗ (N-1) controllable first semiconductor switches (QaO, Qa1, Qa2, Qa3) coupled in series between a first DC supply rail (Pvdd) and a second DC supply rail, wherein control terminals of the at least 2 ∗ (N-1) controllable first semiconductor switches are connectable to respective ones of at least 2 ∗ (N-1) modulated control signals, - 2 ∗ (N-2) intermediate nodes connecting the series connected 2 ∗ (N-1) controllable first semiconductor switches, - a driver output node or terminal arranged at a midpoint of the series connected 2 ∗ (N-1) first controllable semiconductor switches (QaO, Qa1, Qa2, Qa3) and connectable to a first input of the loudspeaker; - (N-2) DC input voltage nodes for receipt of (N-2) DC input voltages, - a switching matrix comprising a plurality of controllable second semiconductor switches (Qa4,Qa5); the switching matrix comprising at least (N-2) switch inputs, coupled to respective ones of the (N-2) DC input voltage nodes, and at least 2 ∗ (N-2) switch outputs coupled to respective ones of the 2 ∗ (N-2) intermediate nodes of the first output driver; and - a switching matrix control circuit configured to: sequentially connect and disconnect each of the (N-2) DC input voltages to a predetermined set of nodes of the 2 ∗ (N-2) intermediate nodes of the first output driver (340,440) via the switching matrix in accordance with one or more of the 2 ∗ (N-1) pulse width modulated control signals of the first output driver (340,440); wherein each of the plurality of controllable first and second semiconductor switches is a power transistor; N being a positive integer larger than or equal to 3.