An assembly of a sound generator and a circuit, the sound generator comprising a coil having a first and a second coil terminal, the circuit comprising: - a first and a second input terminal, - a first and a second output terminal, the first output terminal connected to the first coil terminal and the second output terminal connected to the second coil terminal, - a first amplifier (62/66) having an input and an output, and - a second amplifier (64/68)having an input and an output, - a first (52/56) and a second (54/58) switch, - the first switch being configured to alter between 1) connecting the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal and 2) connecting the first input terminal to the first output terminal, and - the second switch being adapted to alter between: 1) connecting the second input terminal to the input of the second amplifier and the output of the second amplifier to the second output terminal, when the first switch connects the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal, and 2) connecting the second input terminal to the second output terminal, when the first switch connects the first input terminal to the first output terminal, characterized in that the circuit comprises: - a voltage input terminal connected to voltage supplies of the first and second amplifiers, - a controller connected to the voltage input terminal, the controller being configured to control the switches, the controller being configured to, when the voltage supplied to the voltage input terminal is below a predetermined voltage: - control the first switch to connect the first input terminal to the first output terminal and - control the second switch to connect the second input terminal to the second output terminal and the controller being configured to, when the voltage supplied to the voltage input terminal is above a predetermined voltage: - control the first switch to connect the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal, - control the second switch to connect the second input terminal to the input of the second amplifier and the output of the second amplifier to the second output terminal. - a first and a second input terminal, - a first and a second output terminal, the first output terminal connected to the first coil terminal and the second output terminal connected to the second coil terminal, - a first amplifier (62/66) having an input and an output, and - a second amplifier (64/68)having an input and an output, - a first (52/56) and a second (54/58) switch, - the first switch being configured to alter between 1) connecting the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal and 2) connecting the first input terminal to the first output terminal, and 1) connecting the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal and 2) connecting the first input terminal to the first output terminal, and - the second switch being adapted to alter between: 1) connecting the second input terminal to the input of the second amplifier and the output of the second amplifier to the second output terminal, when the first switch connects the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal, and 2) connecting the second input terminal to the second output terminal, when the first switch connects the first input terminal to the first output terminal, 1) connecting the second input terminal to the input of the second amplifier and the output of the second amplifier to the second output terminal, when the first switch connects the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal, and 2) connecting the second input terminal to the second output terminal, when the first switch connects the first input terminal to the first output terminal, - a voltage input terminal connected to voltage supplies of the first and second amplifiers, - a controller connected to the voltage input terminal, the controller being configured to control the switches, - control the first switch to connect the first input terminal to the first output terminal and - control the second switch to connect the second input terminal to the second output terminal and - control the first switch to connect the first input terminal to the input of the first amplifier and the output of the first amplifier to the first output terminal, - control the second switch to connect the second input terminal to the input of the second amplifier and the output of the second amplifier to the second output terminal.