Mike,
The MXT is
NOT a low volume detector by any means. Quite the contrary.
However, it does not have a volume control per se. Since this is a new detector and
it is also new for you, you need to be a little more specific as to what audio you are
referring to. Here are some additional hints. I am assuming you are somewhat new
at this. If not, my apologies.
MXT's like relatively high, high impedance earphones for best audio performance.
You can rule out any earphone problems by not using them in these tests. The built-in
speaker should be loud enough.
In general, the discrimination control does not affect the audio volume, other than
nulling the audio for targets whose conductivity is below the discrimination level.
If you are referring to the backgroun threshold volume, that is adjusted by the threshold
knob on the bottom left. It is good practice to set it as low as possible, while still being
able to hear it.
The next control that (somewhat) adjusts the target volume is the sensitivity or gain control.
Thats the knob above the discrimination knob. It is really a multi-purpose knob. As you crank it
up, the microprocessor inside adjusts the pre-amp gain (hey, it's not just the XLTs and DFXs that
have adjustable pre-amp gain
), as well as the sensitivity and target audio. If you crank the knob
into the + region, you will also get a boost in the audio volume and ultimately you'll lose audio
modulation.
Using the built-in speaker (and fresh batteries) do the following:
Set the sensitivity to about 8.
Turn discrimination to 0.
Set the track switch to lock.
Flip the program toggle to Coin and Jewelry.
Flip the three way toggle switch under LCD display pod to center position.
Turn on the detector.
Set the threshold so that it is just audible.
Now, sweep a coin like a quarter (oops, you are in the UK. Pick a coin)
a few inches from the coil.
You should hear a pretty healthy beep. If not, something is very wrong
with your detector.
Hope this helps.
