Eztronics Corp&reg; TDA2030A 2.1 Stereo Audio Amplifier 3 Channel Subwoofer Bass Amplifier Board Adjustment Type: Master Volume + Treble + Bass Power range: AC8-18V * 2 Recommended Power: AC12V * 2 30W Cooling volume: 80 * 30 * 45mm Tone board size: 81x49.5x25mm (length x width x height)