Audio apparatus comprising a housing and a piezoelectric transducer (12) mounted in the housing (10) so that the transducer is adjacent a user's pinna whereby the transducer excites vibration in the pinna to cause it to transmit an acoustic signal from the transducer to a user's inner ear characterised by comprising a coupler (14) coupling the transducer (12) to the housing (10) with the coupler (14) approximating to a simple support for the transducer (12).