The MAX mine will get with the small coil is 7.5" in the air on a dime in 3 tone mode, and that's with tone only and no ID numbers. Two tone is much more sparky than 3 tone on my machine. I can get it to air test the dime at 9.5 inches in 2 tone mode with audio only. If you go by where it IDs down to, its a bit less...about 7 inches for 2 tone.
This is all in the air.
In the ground, I can only get an iron signal on a quarter buried at 7 inches. If you were going by ID and tone, you wouldn't dig it all.
In several hunts and test....I have not dug anything deep with it, other than recently lost clad. In trying to find out why, I wanted to test the separation ability of targets on a 2D plane instead of a side by side separation test where the targets were all level to one another. In those tests, the Racer can quickly pick out all targets individually...even when they are VERY close to one another. I wanted to see what the Racer could do if I took a coin, place it at approx 2-3 inches deep...and then place a piece of aluminum foil, pulltab, or crown cap, etc at a shallower depth than the coin. NOT directly over top of it, but off to the side. What I discovered...in some instances, the Racer can pick out two targets...but the ID will NOT be in the 80s for the coin. No matter what you do. No matter what angle. The best I have been able to see are ID numbers in the 50s through 70s on some of the coins. I tried it with a dime and quarter and moved the pieces of trash to almost 3 inches away from the side of the coin and still got the same results. You can remove the trash and boom...IDs in the 80s. This is compounded even more when there are pieces of trash placed on both sides of the coin. If the coin is buried deeper than the trash, it is very hard to get the signal. I currently have 3 of the fastest recovery speed machines on the market today...the Racer pro pack, the Deus, and F19. All 3 of them struggle with this...I wouldn't trust specific tones or IDs on any of them if you are wanting to get deeper coins in the trash. And I'm only doing this with the coin just a couple inches deeper than the surface trash. This is compounded even more when the coin is placed further away from the trash...aka, deeper.
I tried this with buried targets in my test garden too, to see if the air gap might have been throwing my test off. In ground...it's even worse, and the coin has to be even shallower for you to be able to hear that there are two targets.
So what I gleamed from the whole thing is...if you are hunting in heavy modern trash and relying on target ID to determine whether you dig or not, you are probably leaving a lot of coins in the ground by doing so. Whether you believe you are or not. The Deus with a little tweaking of the recovery speed, can pick the targets out the best of the 3 detectors I currently have. The Racer is 2nd best at it...but ONLY if you are digging all signals that come up as non iron, regardless of the ID. It seems to be a lot better in iron than in modern trash. I personally see it as being a better relic machine in iron than being a good coin hunter in modern trash. Just my personal opinion: Some guys are making it sound like its the holy grail of detectors for coin hunting in heavy modern trash and sparking a lot of interest that is going to lead a lot of people to disappointment if that is their intended use. If you are hunting a spot with only isolated trash and deeper targets...I can see where a person might be happy. It will go deep with the stock coil in those type places. But for areas choked full of can slaw, tabs, crown caps, etc...based on my findings, I would see most of the coins being recovered as being clad and less than 4 inches deep if you are listening for that good high tone and looking for those 80 VDI numbers. Your milage may vary.