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General Operation The ES-9 is an external 9 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-9 is perfect for you. Using a stereo cable to bring +9 Volts up 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 ususally add alot 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.