Yep, and that 2, maybe 3 tops increase will be for a coin size object.
On large relic sized objects, the increase could be larger as I'm kind of
suspecting the increase would be proportional to size also.
IE: if a stock coil does 7-8 inches on a quarter, and the 9x12 does 10-11 inches,
that's what, maybe a 20% increase? I'm too lazy to do the math.. :/
So if a stock coil could hit a large metal chest at 24 inches, the 9x12 *might* be
able to hit the chest at nearly 29 inches or so, which would be about 4-5 inches
increase..
Course, this is mainly speculation on my part.. I've never actually tested it yet.
With mine, using a quarter, I get just about 3 inches maximum more depth with
the 9x12 running it hot.
So I consider it worth 2-3 inches, and most others seem to agree.
But I also run the machine pretty hot. I find this is pretty much required if you
want to get the *very most* depth from the machine.
With the 9x12, you want to run it as hot as you can stand it if you really want to
go deep. Need to use a fairly fast swing too. This applies to the stock coil also,
but I think it shows up more with the 9x12.
If you run the sensitivity only half way as an example, you are going to miss a
few objects that the coil is capable of seeing, but the machine is "squelching"
for lack of a better term. Expect many of the deepest objects to be sporadic
or one way hitters.. That is normal. If you ignore all those, you will miss a few
things. If I can get a one way hitter to repeat, I always dig it. Also the pinpoint
mode can help verify if the target is real.