Graph Tech Ghost - Manual (Page 62)

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A battery is required to power the Acousti-Phonic. The magnetic
signal has to go through the Acousti-Phonic for blending purposes,
so if the battery is removed or dead, there will be no output from
the 1/4” jack, not even magnetic pickups. In normal use this
battery lasts 500 hours, which means changing it twice a year
will ensure that it never goes dead. Always unplug the cable from
the 1/4” jack to conserve battery life when not using the guitar.
Connect the Battery Clip Harness (red, black, a short
red) to the battery and insert the battery into the metal
holder. Locate the battery along the side or back wall of
the control cavity, or on the cavity cover plate. Make sure
the wiring harness will reach the Acousti-Phonic, then
peel and stick the Battery Holder to the chosen location.
The Acousti-Phonic is designed to operate on 9v or 18v, and
the same batteries that power it can also power active pickups
or another on-board device by using the short, red Auxiliary
Power Lead. Ground the active magnetic pickups using any of
Battery Power