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There are several advantages to using transformers.#connect speakers with different impedances without causing differences in output between the speakers.#add or remove a speaker without having to recalculate the entire system's impedance.#reduce signal loss on long distance wire runs (like 50ft or more)== Amplification ==The Realistic MPA-20 is a 20 watt Solid State PA Amplifier sold by Radio Shack at one time.