I thought there may be something wrong with my Explorer II until I read this post. Bought it new and right off the bat it had a problem, the cable inside the housing was damaged and wouldn't come out of startup mode. Had to send back to Minelab for repairs, works great now. I think. I asked them if it was possible, to tune it with a preference for deeper hunting, have no idea if that is even possible for them. It does completely drain a set of NIMH AA batteries, or the NIMH battery pack, in about 3 hours. I hunt primarily in central Ohio, the soil is fairly mineralized.
I am able to consistently hit buried quarters at 8 - 9", and if I set sens to 10 or 11, consistently reads quarters at a measured 10 1/2" depth with stock coil and only light falsing. My conductivity and ferrous readings both seem a bit off from what I've observed on the other posts. Clad quarters read ferrous 7 and conductivity reading of 28 - 29.
I am actually quite happy with the detector, I have a Garrett GTI 2500 and DFX and it will do at least 1" = 2" greater depth over either of these models.
If I have a complaint, it's that pinpoint mode drives me bannanas. It seems to hunt deeper in discrim mode than pinpoint. I'll get signals on the test bed that definitely hint there's a quarter there and even at that depth, readings are reasonably consistent, "off" only occasionally, close to the "fringe" for this machine. I'll move the coil to the side, hit pinpoint, try to scan the coin; nothing. Repeat...nothing. Throw a quarter on the ground, pinpoint it, then pinpointing the buried target, after about 5 seconds, it'll start indicating a target, weak signal, in pinpoint mode. Switch to discrim mode, find the target (I frequently find I have greater confidence in pinpointing with discrim mode than pinpoint) go back to pinpoint, repeat, now it's going off when the coil is over the sides of the hole but not over the target. Try it again, now I have three targets identified. Give up, go back to discrim. I just found a 1915 Barber quarter yesterday, it was at fringe depth, pinpoint was not useful.
Pull out the DFX with hotshot coil, flip the trigger forward to all-metal mode, easily identifies, with very strong signal, the 8", 9" and 10 1/2" buried quarters when DC sens is bumped up to about 45, very easy to center over the target with VCO on. Makes me wish I could lug two detectors around...perhaps. Read dozens of posts, read a couple books, switch the DFX to discrim mode, try adjusting settings for 90 minutes to every conceivable setting to gain max discrim depth attainable; about 8" on the same targets. Can someone meld the DFX all-metal and Explorer II discrim performance into one machine?