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The MPA-20 Amp uses a 70v system. When using transformers, power from the 70v terminal is being supplied to the transformers to "localize" the amplification power to the speaker, when the transformer is at or near the speaker.The MPA-20 Amp uses a 70v system. When using transformers, power from the 70v terminal is being supplied to the transformers to "localize" the amplification power to the speaker, when the transformer is at or near the speaker.