GPX6000 coiltek test site
I might be wrong but the 6000 seems to be struggling to find all the targets? The QED of course can easily find them all!

doug

Doug from my observation of that GPX6000 test video at the Coiltek site is the operator first test was using the “Difficult Ground Type” mode setting with the Sensitive / Gain set at its lowest Manual (1) setting and the lowest Volume level setting at one (1) bar.
The 6000 then appeared to struggle to get a clear response on the 2 deepest test targets.
The operator then changed the Sensitive/Gain setting to Auto + with Threshold Off for NO response on the largest & deepest target off on the left.
Moving over to the 2oz at 20 inches, using the same setting, his first swing produced NO response then as the coil touched the ground it appears to me the “Geo -Sense” may have created some type of interference or instability for the operator to then press the “Noise Cancel” button. The detector still failed to produce a response until the operator pressed the button for the Threshold On and was able to then get a response on the 2oz target as interference started to creep in, then fading as he produced a response on the other three targets.
The operator then returned the detector to its lowest Manual one (1) Sensitive/Gain setting to repeat a response on the same three targets and again NO response on the 2oz at 20 inches.
To be fair I wonder if another GPX6000 operator may have got a different result to all targets?
Regarding the QED -test video the QED’s settings printed on the video had its THS-A up at its highest setting as was its Gain setting which I expect does increase its response to targets. Also, the printed message at the beginning of the video, it highlights by saying a lack of interference during the test and a lack of a loud Threshold.
By the way this Reg fellow appears to be highlighting the fact that only a member such as myself has decided to make a posting here for some time, which is true for me as I think my last time was over 12 months ago.