I FOUND THAT ELECTRICAL INTERFERENCE EFFECTS DEPTH GREATLY.MY FRONT YARD IS UNDER A POWER LINE AND A BURIED 200 AMP LINE LESS THAN 50 FT AWAY WITH CLAD QUARTER ON GROUND AND A CARDBORD BOX ON TOP TO HELP ACCURACY.I COULD ONLY GET TO MANUAL 21 WITHOUT IT GETTING VERY ERATIC AND I NOISE CANCELLED SEVERAL TIMES TO MAKE SURE. BUT AT 21 UNDER THE MENTIONED CONDITIONS ALL I COULD GET WAS 11" WITH DECENT SIGNAL.AT MY SHOP TODAY WHEN I POSTED THE AIR TEST I COULD RUN IT TO 30 SEN. AND IT WAS QUIET AND STABLE AND THE QUARTER WAS ON WHITE LIMESTONE GRAVEL DRIVE.
I WENT TO A PARK TONIGHT THAT I HAVE HIT HARD WITH THE ETRAC AND ONLY FOUND 2 WHEATIES AND A 1905 BARBER AT 6" ON EDGE AND IT WAS LOUD AND CLEAR AND I CALLED IT A SILVER DIME WITH WITTNESSES WATCHING.THERE WAS IRON NEAR IT ON TWO SIDES AS WELL..
I AM GOING TO THE COURTHOUSE ONE MORE TIME TOMORROW AFTER CHURCH WITH ANOTHER FORUM MEMBER AN DO SOME TESTING IF WE CAN FIND SOME TARGETS,RAY.
PS. MY SERIAL # XQ1 12859
I WENT TO A PARK TONIGHT THAT I HAVE HIT HARD WITH THE ETRAC AND ONLY FOUND 2 WHEATIES AND A 1905 BARBER AT 6" ON EDGE AND IT WAS LOUD AND CLEAR AND I CALLED IT A SILVER DIME WITH WITTNESSES WATCHING.THERE WAS IRON NEAR IT ON TWO SIDES AS WELL..
I AM GOING TO THE COURTHOUSE ONE MORE TIME TOMORROW AFTER CHURCH WITH ANOTHER FORUM MEMBER AN DO SOME TESTING IF WE CAN FIND SOME TARGETS,RAY.
PS. MY SERIAL # XQ1 12859
My gut tells me that there's nothing wrong with any of them but we'll see what happens. At least we know that we got them from the same source: Lynn at Detector Depot and received all of the added benefits of buying there, plus that secret turbo depth add-on that Lynn slipped in! 

......well maybe the 14xxx series works in England without the Turbo Depth feature that the 12xxx series has here 