Abstract: The loudness level of an electroacoustic transducer (6) of a device (1) is controlled such that a loss in the sound pressure caused by an acoustic leak is compensated as best as possible. The device (1) is, for example, a receiver of a telephone, a hand-held radio telephone, a cordless telephone or the like. A variable interspace (22) is formed between the receiver, or earpiece (3) thereof and the ear (16) of the user. The sound pressure in the interspace (22) is measured with the aid of an acoustic sensor (11). The power of the loudspeaker (6) is controlled as a function of the measured sound pressure with the aid of a control circuit (9). The acoustic sensor (11) is, for example, a microphone which is arranged in a separate spatial volume (14) next to the loudspeaker (6).