50
THRESHOLD
Threshold is the constant background sound
produced by the detector to help distinguish
between desirable and undesirable targets.
When a rejected target is detected, the
Threshold sound ‘blanks’ (becomes silent) to
indicate that a rejected target is underneath
the coil.
Speaker/Headphone Threshold
The X-TERRA 305 and 505 are able to save
separate settings for both the speaker
Threshold and headphones Threshold,
switching from one to the other automatically
as the headphones are connected (Accessories,
p. 72).
When the headphones are unplugged, all
changes to the Threshold setting are applied
to the speaker Threshold. When the
headphones are plugged in, the headphones
icon will be displayed and all changes to
the Threshold setting are applied to the
headphones Threshold.
The Threshold volume should be set to the
preferred level. It is important to note that
small surface objects, as well as large deep
objects, will produce very small changes in the
Threshold sound. It is therefore important to
set the Threshold control correctly to ensure
that these targets are heard. Try experimenting
with known targets to assist in setting this
control.
X‑TERRA 305
Threshold range = –5‑25
Speaker Factory Preset = 12
Headphones Factory Preset = 10
X‑TERRA 505
Threshold range = –5‑25
Speaker Factory Preset = 12
Headphones Factory Preset = 10
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