Hi folks, I received my Conquistador (non uMax) the other day, we had a couple of "warm enough" days so I went to a school ground and gave it a test run. It seemed a little "noisey" compared to the other Tesoro's I have owned. Even seemed to beep by just swinging the coil when there was nothing under the coil. It wasn't hard to pick out the louder hits & I got my usual clad (at pretty good depths) and 3 pieces of small jewelry. I got thinking about the "noisey" of the Conquistador and thinking it should be smoother than it was, I threw her in all metal set the threshold to a slight hum (can get a nice steady hum)and sure enough the ground balance setting either at the factory or by the previous owner was set way too negative for my ground. I adjusted it to a very slight positive setting and now my Conquistador is as calm as a kitten with no beeping/noise unless there is a target under the coil. There isn't alot of info out there on te Conquistador but let me tell you that it is a very good machine as all Tesoro's are. It hits very hard on the lower conductive items and also coins. I had it for sale but now I am keeping it. Thanks & Happy New Year! Steve.