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General Operation The ES-18 is an external 18 Volt battery supply for EMG Pickups. If you have an instrument that doesn’t fit a battery, or you don’t want to install a battery, the ES-18 is perfect for you. Using a stereo cable to bring +18 Volts via the Ring contact to the instrument, you can power your instrument easily.
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Using an AC Adapter (Battery Eliminator): Using an AC Adapter is not a great idea. They tend to be noisy. EMG has yet to spec or design an AC Adapter. Effects pedals tend to be noisy because they usually add a lot of gain. Since the pickup is the first element of the chain it’s best for it to have as quiet a power supply as possible, thus a battery.