Method and circuit for testing an audio high-frequency loudspeaker being part of a loudspeaker system

The present invention relates to a method and a circuit for testing a tweeter (4B) in a bridge-type class D switching amplifier, said tweeter (4B) being part of a loudspeaker system (1A), wherein the method includes the steps of: applying a high-frequency voltage signal (VinAC) to one terminal (4D) of said tweeter (4B), said high-frequency voltage signal (VinAC) being generated by first electronic means (8); applying a constant voltage signal (VinDC) to the other terminal (4E) of said tweeter (4B), said constant voltage signal (VinDC) being generated by second electronic means (9); measuring a current I load that flows through said tweeter (4B) into said second electronic means (9); determining a connect/disconnect state of said tweeter (4B) from the value of said current (I load ).