A battery-powered acoustic device designed to provide ultrasonic broadband noise and/or sweep-frequency stimuli noise of sufficient intensity and bandwidth to mask tinnitus (a ringing sound in the ear or internal head noises) by neutralizing a patient’s perception of the symptoms for temporary relief. It consists of an out-of-ear miniature generator/amplifier with a piezoelectric element which conducts the noise to the inner ear across the skin and via the mastoid bone; it may be contained in a case worn behind-the-ear (BTE), attached to a headband, or hand-held by the user against the skin over the mastoid bone.