The acoustic radiating membrane is provided to equip a musical watch or a striking watch. The dome-shaped membrane comprises an active central portion, a lateral wall and a peripheral edge portion for holding the membrane in a watch case. The central portion includes a central base connected by connecting elements to a peripheral ring, the central base, the connecting elements and the peripheral ring being of dimensions determined to amplify a first vibration mode of one or more notes in a frequency range from 500 Hz to 3.5 kHz.