As in all amplifier modules the output power varies with the supply voltage and speaker resistance. In this module the highest output of 18W is achieved at 13.2V into a 4 ohm speaker/ The amplifier IC uses a Bridge Tied Load (BTL) configuration to connect the load. This means that the outputs are floating with respect to the negative supply rail (or ground). Therefore the outputs of the amplifier should never be connected to ground.
DO NOT OPERATE THE MODULE WITHOUT A HEATSINK. Bigger is better!
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