Nonferrous targets, I dug them. Try airtest. I haven't but have a hunch based on what I saw today you will see difference between say !N and 2F tone. I posted on another forum, gent didn't beleive me, He did airtest here are his results;
A test for you settings boost mode 99 0 disc 1n 8 inches on a 1935 merc with the 5dd coil In 2F I got a faint hit at 10 inches same coil, so yes I would say a bit less sensitive, probably do to eliminating iron in this tone, effects sensitivity coin shooting, your correct now I think maybe you could be correct when the tone eliminates or they call it mute it knocks the iron out , some thing like your notching out iron , using 1n . So if your running the 11dd and had 3 deep targets that 2 inch difference of depth loss, maybe more or less with a larger coil, I could see what your claiming, I don't use 1n or 2f but maybe next time out in dirt, and ground balanced , I will give it a try, air testing in the house , is not a good test, I found that out with the Excalibur, happy hunting bro try 4H , I like it their, Earl