Hey Freddy,
Jugghead has some good suggestions, you might also try making a test patch of your own in your backyard. Bury whatever you are going to hunt the most, coins, relics, or whatever at different depths, and listen closely to the machine it will tell you what it has found. Each machine speaks a different language even between the same brands the detectors will have a distinct sound pattern of their own.
If your interest is hunting coins get a copper and clad penny, a nickel, silver and clad dime, quarter, half-dollar, and dollar don't forget to get a S.B. Anthony and Sacajawea dollar.
Now bury them at different depths from just below the surface (replicating a freshly dropped coin) to 12+ inches or more. Mix up the coins as you bury them (put a silver dime at 6" and a clad dollar at 4", and a silver dollar at 8") First and foremost make a map of your test plot as you go so you can understand what your machine is trying to tell you as you go over it in the future. This is not going to be something you will learn overnight it WILL take a lot of time and patience, but it will be worth it in your search for your target.
Unfortunately until they make a machine with AI and voice response technology we will have to learn our machine's beep, chirp, and, squawk language.
Jugghead has another good point in that most coins are not going very deep (4 to 6 inches) because we have not been using coin as money but 4 or 5 hundred years before that it was shells and rocks. The Spanish, French, and English were the ones that brought coins to this country. I know this is long, but, I hope it helps.
MacNab
Texas
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