Don't know as we don't have much info on how this machine works. All we know is that Fisher brought in Dimitar as the engineer, who was told to design 3 metal detectors.
He never designed a metal detector before. When First Texas took over Fisher he was gone. Coinstrike, Edge, Excel were terminated.
"Yes...... Dimitar knew nothing about detectors when Fisher Research Laboratory (Roger Cimino) brought him on-board. And Dimitar was never given any blueprints of any existing detector platform........... so as to have Dimitar start with 'new' mindset."
I run the Edge in disc mode accepting iron down to -26. No notching. Listen to all four tones, if an iron tone comes up (-0 numbered targets), will check the ID numbers. Unless they are -16, -21, -24 bounce to -26 I will not dig them when coin jewelry hunting. They will be iron. The minus numbers indicated are CA clad coins on edge or possibly a nail.
The Edge reminds me of a combination of diff. Tesoro detectors, simple, easy to use, light weight, just deeper and has touch pads instead of knobs and switches.
Probably why I like it..................
Now, it is possible my C$ may have had some issues that I was not aware of, bought it used at a super low price.Know it wasn't a coil problem since I had 6,8,10" coils, unless all three coils were bad.