I hope y'all can help me out. I've owned a couple of minelab Explorers in the past, and they did ok for relics, but I want a basic machine that will hit deep on bullets and relics without all those crazy sounds. Where I hunt, the Explorers have been the "best" machines to cover the ground, and sometimes those deep targets don't get discovered uless the user follows up on those barely audible chirps to see if they lead to something. I don't have an Explorer now, but do use an Xterra 70, which is ALOT more lacking on depth. If an F-70 will give me equal to or greater depth than an Explorer, I may get one, simply because of price. If I need to go with a 75, price just may be a factor at this point. Looking for a used unit of either model. Thanks for any help!!