That dime you seen on the ground was it a Canadian dime?? These will give all kind of differnt signals if it is a new one. These have a ferrous content in them as they do stick to a magnet and if the iron mask was off I can see it not get a signal at all while with the iron mask on it could give some weird signals. Look at the owners manaul section 7-5.1 as it explains the iron mask why for a person new may preferre it off and those that know the Sovereign will like it on as it will see coins in with iron that with it off it may not. It will run smoother in the iron mask off that iron mask on.
On the MXT and the Sovereign as you see you have to go slower with the Sovereign so the MXT may be better for picking up clad and some of the older coins while the Sovereign you may not get quanity, but get quality as it will see coins in the ground deeper that have been there over the yerar. If you burry a coin the MXT may show deeper than the Sovereign will, but those that are accualy there the Sovereign will see them deeper.
On the Explorer and the Sovereign i will say the Explorer is a very impressive detector and has some great depth if you have all the setting correct for the area you are detecting. If you dont than the Sovereign will go deeper i have seen for the reason there is not so many differnt adjustments you can do with the Sovereign. I have and use them both and will say after 5 years with the Explorer I still have a problem finding some coins. My reason is the tones on the Explorer dont last as long for some of us with bad hearing to hear as the Sovereign will keep the threshold tone of the last target untill it sees the next. On the Explorer it is a quick tone change and back to a normal threshold and I feel some times I dont hear that tone change as it is so fast with my bad hearing. Depth wise I have dug my deepest coins at the same depth, ID wise i find I can tell a good from a bad target easier with the Sovereign. I do notice I seem to dig more deeper coins with the Explorer, but also dig more trash too with the Explorer.
We did some side by side comparison on good signal the Explorer got to see if the Sovereign could hear them and I would say 95% of the ones the Explorer got the Sovereign did too. I would also say 10% of the signals the Explorer seen that the guy thought was a deep coin the Sovereign nulled on were deeper iron as the Sovereign was able to ID it better and feel the reason is the Explorer has a bit more power and many iron will be read iffy like some of the real deep coins do.
My guys around here with the Explorers are really kicking butt this year as between 3 guys I know of over 200 silver coins added together with 12 of them halfs this past month found here in ND , so we know in the right hand the Explorer can and will work great. Now I also know of 3 guys in the last month with the Explorers have got less than 6 silver coins in the last month too and they put a lot of time in the feild too, one of these guys has a Sovereign too and find he can find much more with it than the Explorer for the times out as he knows the Sovereign well.
Both are excellent detectors and the Explorer has a longer learning curve for some and some never are able to understand it, the Sovereign is more of a turn on a go detector and will do well, so depending on how well you can learn and understand the Explorer is how well you can do.
I use them both and do good with either one, but the Sovereign is the one I feel more comfortable with and trust the ID.
Good luck
Rick