A good old coin garden will answer many of your questions.....................

[big-ears]

I like many of you had many questions about my Quattro when I first got it. I kept playing around with it, and thats what you are doing.......playing around, and thats fine. if you really want some serious answers, start your own coin garden, create different situations for example, a silver dime and a rusty nail together, or a silver dime at 6,8, and 10 inches. I learned more and started to find more. I always start out with a silver dime(s), it is usually the smallest I find, so its my baseline. The dirt must be packed in the hole you dig by the inch, do not refill the hole and pound it down. Do it an inch at a time. You want it hard packed. when you are finished with the garden, drown it with a hose and then you are ready. I still use it today with my Explorer and it tells me what coins sound like deep, shallow, with a nail close by, on edge etc. Its not perfect, the coins have not been there for a 100 years, but its as close as I can get to the real thing. I still use it after almost 5 years. I will listen to a deep silver dime and then walk around my yard trying to find that same sound, or change settings over the dime to see what each does or doesn't do. Its the best teaching aid you can have. I noticed questions about depth , sounds, all metal, small coils, location of silver on the screen etc, all these are easy to answer with your own garden.......HappyHunting.......