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High power TDA7498 digital audio amplifier; power supply: DC 15-34V; output power: 100W+100W 90% high efficiency; please note that the differential inputs can minimize common-mode noise Output impedance 4-8 ohm; Four fixed gain settings available: 25.6 dB, 31.6 dB, 35.1 dB and 37.6 dB Output power: 100W+100W (Vcc = 36 V, RL = 6Ω, THD: 10%); Output power: 80W+80W (Vcc = 34 V, RL = 8Ω, THD: 10%) With short-circuit protection, over temperature protection; also with standby & mute features on this amp board