Module limit Operating voltage DC 32V, the recommended voltage DC 10-24V.
Its power supply voltage, the output impedance, thermal environment and other factors.
Generally in the 1KHz, distortion power continuous use of 10% as follows:
RL = 4 in Europe, when the power supply 12V, minimum 15W, typical 17W
TDA8932 Digital Amplifier Board 15W / 30W / 35W Mono Amplifier Module Low Power