As High VDI and Cuda said, no machine can disc out non-ferrous trash (aluminum screw caps (duh), pull tabs, copper nails (seriously?), shotgun shells (again seriously?), ), that is just physics.
Regarding iron nails, a lot of complaining but no mention of whether iron bias (especially the new more effective F2 setting) is being used. Please post back once you all get a handle on how to properly set up the machine to mitigate falsing. Minelab provided the features, but only you can choose to use them.
The Equinox is not Harry Potter's magic wand, it is just a vlf detector, and like all induction balance machines has limitations and can't work miracles. Learn a little about the physics of the detector and then you won't look so foolish complaining about things that cannot be solved with this type of technology multi frequency or not. Multifrequency merely helps with salt balancing on the beach and enables a broader range of targets to be ID'd at depth without the limitations inherent in single frequency machiens. This means it should hit about as well on gold jewelry and mid-conductive brass and lead relics as well as it does on silver coins, where single frequency machines tend to favor one or the other depending on the operating frequency it uses. It also means that mid-conductive brass and aluminum junk (shotgun shells and pull tabs and screw caps) are also going to get pinged as well. Gaining some experience with the machine to understand the tonal nuances that occur with irregularly shaped junk, use of the pinpointer to get clues as to the footprint of the target (so you know the difference between a quarter and an aluminum beer can which will ring up similarly) and multi mode interrogation techniques can up your treasure to trash ratio a little, but if you expect any machine to tell you the difference between a shotgun shell and civil war coat button, please reset your expectations and take a reality check that with detecting practically nothing is 100% certain and always involves balancing tradeoffs.
No one likes to show their trash pile when showing off their keepers, so some less experienced folks get the false impression that no one but them is digging trash out there. Uh, nope.
Gotta take the good...
With the bad...
