Garrett GTI 2500 Owner's Manual page 43

Use the (+) and (-) touchpads to adjust
audio to the target sound volume that you
prefer. Touching the (+) pad will make the
sound louder, while touching (-) the will
lower the volume.
Since this adjustment controls the maxi-
mum volume of sound produced by the
GTI 2500 when a target is encountered, it
will not affect the threshold level you have
already selected as the primary audio
function of your detector.
When headphones are used, it will usually
be necessary to decrease volume since
detection sounds are louder over head-
phones. Experiment to determine which
volume is best for you.
Graphic Target Imaging 2500 -