Sure Electronics 6 X 100W 6 Ohm Class D Audio Amplifier Board - TDA7498 A perfect "Class D" architecture Gain adjustablefour fixed gain settings: 25.6dB,31.6dB,35.1dB and 37.6dB Line level audio signal input Externally synchronizable,Over/under voltage turn off,current protection,temperature protection Mounting holes facilitate installation and fixing