Question still remains Xterra coils wich would be all around best to leave on

[Trackerman]

well the 3 frequencys are good but if one must leave on just one coil and choose just one coil. Hmm wonder wich is best 7.5klhz concentric 3klhz concentric or 18.75klhz concentric. Of corse im speaking for coins and jewlry.Also im only speaking of 9inch concentric minelab coils

 

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[X-Terra70_TreasureHunter]

According to George Payne, the father of today's metal
detector technology, a silver dime responds best to a
frequency of 2.7 kHz. Nickels and gold jewelry respond
best around 16.5 kHz. All other US coins are most
responsive to frequencies under 10 kHz. Gold nuggets are
better served with a frequency of 20 kHz or faster. But
again, I've found silver, copper and gold with each of the
eight X-Terra coils.

So you compare these facts to the coils offered by Minelab
for the X-Terra series

I use the 7.5kHz DD coil all the time, you can beat it w/ a STICK
goes deeper than what you'll really want to dig.

I located a 2" copper water pipe @ 24" w/ my machine.

Dave

 

[Trackerman]

Your right 7.5klhz kicks but.Deeper than the 18.75klhz and seems to hit variety of stuff better than the 18.75klhz. Also the 7.5klhz should hit jewlry better than the 3klhz because of the slightly higher frequency. Manny nock the 7.5klhz stock but it seems to rock.