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Chapter 6 MXT Searching
Headphones
The headphone jack on the GMX is located on the
control box above the battery compartment. There
is a dust cover on the headphone jack that needs to
be removed before the stereo plug from the head-
phone is inserted. Replace it when headphones are
not being used. Most users prefer high quality
stereo headphones so White's has chosen to wire
the headphone jack for stereo. If you have a mono
headphone, you can purchase an adapter that will
allow sound in both earpieces. Some headphones
come with a switch for stereo or mono jacks.
In choosing headphones, make sure they have a
VOLUME CONTROL as there is no target vol-
ume control on the GMX. This is an important
comfort issue. Remember that you want the
faintest THRESHOLD "hum" possible but a
strong comfortable target signal. With headphones
you will be able to work with a lower THRESH-
OLD "hum", hear fainter target signals, avoid
bothering others with a "beeping" box, and save
on battery life. Many high quality headphones
from full ear enclosure to lightweight summer
models that offer a bit more safety in snake and
bear country are available on the market. Higher
impedance headphones (60 Ohms or greater) give
the most sensitivity and are better for hearing the
tiny targets most likely to be heard while prospect-
ing. Properly balanced impedance is important as
well as low distortion.
Chapter 5 MXT Controls
