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GM24k Searching
Goldmaster 24k User Manual 17
Headphones
The headphone jack on the GM24k is located on the
rear of the battery box. There is a dust cover for the
headphone jack (in your parts kit) that should be used
when not running headphones. Most prospectors
prefer high quality stereo headphones so the GM24k is
wired for stereo sound. In addition to the volume con-
trol headphones included with your detector, an 1/8” to
1/4” headphone adaptor is included. Plug this adaptor
into the headphone jack to allow the use of other 1/4”
size headphones.
1/8” to 1/4” headphone adaptor
Headphone jack dust cover
In choosing headphones, make sure they have a VOLUME CONTROL. This is an important comfort and
safety 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 THRESHOLD “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 prospecting.
Properly balanced impedance is important as well as low distortion.
Headphone Volume
Since the GM24k has a volume control (accessed by tapping the speaker button and adjusting the audio
volume up or down), certain sets of headphones with in-line volume control offer you added adjustment.
This is due to the fact that the GM24k ’s volume control only affects signal sounds, not the threshold level.
For a maximum range of audio sensitivity, a user would set their GM24k volume at the maximum level,
and then adjust the in-line headphone volume to suit their preference. This will allow for both very subtle,
quiet signals as well as very loud signals, giving you a wide range of target volumes.
For a more moderate range of audio sensitivity, a user would set their GM24k volume at a medium level
and adjust the in-line headphone volume up. This will make quieter signals seem a bit louder and give less
dynamic range, which may aid in target acquisition for some users.