DROK TDA7498 2X100W Dual Channel Class D Audio Amplifier Board, DC 24V Digital Stereo Power Amp Module for 8&Omega; Subwoofer Computer Speaker Motorcycle Adopts TDA7498 dual-channel power amplifier chip, high power, good sound quality, No distortion, give you a great hearing enjoyment Output power: 100w+100w (vcc = 36 V, RL = 6, thd: 10 percent ); output power: 80w+80w (vcc = 34 V, RL = 8, thd: 10 percent ); high efficiency: 90 percent Wide range single power supply: 15-34vdc(recommended 24V), differential inputs minimize common-mode noise Applicable speaker impedance: 8 Ohm best(4 Ohm or 6 Ohm also works); four fixed gain settings available: 25.6 dB, 31.6 dB, 35.1 dB and 37.6 dB With Standby, mute features: short the points Shown on pictures to be Standby or mute, also can be vacant; with short-circuit protection, over temperature protection