Samyo SMSL SA-36A Pro 20W2 Hifi TPA3118D2DAP Digital Stereo Amplifier AMP with 15V Power Supply Has a real 2*20W Stereo design of the circuit. High frequency is very pretty, good ductility and not harsh. Will give you a noble vision, hearing and feeling. Bulit-in speaker protection and power delay circuit,so that the switching machine had no impact sound and protect your expensive speakers. Uses the real fever & Genunie Parts Manufacturing. Advanced aluminum enclosure&pull pattern oxidation process. Come with DC15V power adapter: large dynamic and bursting, better than DC12V.