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Check the listing for details. TPA3250 Bluetooth-Compatible 5.1 Two-Channel Digital Power Amplifier 2*130W. Condition: New. Listed at 79.99 USD. Amplifier chip:TPA3250 1. The negative poles of the left and right channels of the amplifier output cannot be connected together. But don't exceed 32V,otherwise it will burn the amplifier. Otherwise,it will cause the amplifier to burn out.