A vibration transducer (217), which transforms vibration to electrical signals, is arranged in a bell-shaped vibration collecting structure (210). A loud speaker (214), which transforms electrical signals to sound, is arranged in a sound chamber (215). A sound channel (212) opening is provided into the sound chamber and adapted to forward the sound from sound chamber through a throat (218) connecting the sound channel with ambient air. The built-in vibration collecting structure comprises a vibration receiving device which may be e.g. be a microphone or a piezo-electric device. An independent claim is also included for a method to be used with an electronic sound monitor.
