I just picked up Coiltek line of coils so I wanted to test the new Joey 5X10" DD coil against the Sunray X-5 coil and the stock Minelab E-Trac coil with some controlled environment air testing. We all know air testing doesn't give proper depth but it will give us an idea. What I found out was surprising.

First up the Minelab E-Trac stock Pro coil,

1. In auto +3 sensitivity 19, stock coins program it was able to hit a silver dime easily at 9". Audio response all the way to 11"
2. Manual sensitivity at 30 it hit a silver dime at 11.5" easily. Audio response all the way to 13"

With screen all the way open no change in either mode.

Second 5X10" joey coil.

1. In auto +3 sensitivity 19, stock coins program it was able to hit a silver dime easily at 8". Audio response all the way to 10".
2. Manual sensitivity at 30 it hit a silver dime at 9" easily. Audio response all the way to 11".

With screen all the way open no change in either mode.

Third Sunray X-5 coil.

1. In auto +3 sensitivity 19, stock coins program it was able to hit a silver dime easily at 7". Audio response all the way to 9"
2. Manual sensitivity at 30 it hit a silver dime at 8" easily. Audio response all the way to 10".

With screen all the way open no change in either mode.

My conclusion is discrimination on the Minelab E-Trac doesn't really lose depth if any at all. Sensitivity however does lose depth. The Coiltek Joey coil may separate a bit better than stock Pro coil but not get the depth. If you want a trash coil use the Sunray X-5 coil. Much better separation than the Joey and close to same depth.

Anyone with questions feel free to contact me! Love to help you or make you better deals! Thanks, Bart.