I did a little test with a nickel to show that you do not necessarily need full power to hit deeper coins. 50% power, nickel at 8 inches strong, tone break at 40. The signal is a bit iffy but keep in mind this is a freshly buried coin and no halo is formed and also I should have packed the dirt better. One park I hunt has extremely bad EMI so I have to hunt at low sens allot there and I am impressed at how deep I can still pull some items.
http://www.youtube.com/watch?v=KuVXn3yuDO0
HH Everyone
http://www.youtube.com/watch?v=KuVXn3yuDO0
HH Everyone