he GD30CE-12 sports Takamine's TP-4TD preamp, giving you rich, clear amplified output,
instantly. A feature of G-Series guitars, the TP-4TD features a gain knob; a tuner; an active
shelving EQ with bass, middle, and treble sliders; and a low-battery indicator. The preamp
is switched on by plugging a standard instrument cable into the end pin/strap pin jack.
Unplugging the cable turns the preamp off. The TP-4TD is powered by a single 9-volt battery.