Threshold Adjustment

Coming from Tesoros I have picked up a NOX 600. I am use to setting threshold to a barely audible hum. Then setting discrimination. The quieter the threshold hum, the better discrimination works. Or so it seems. So what exactly then does setting threshold do on the NOX? According to the manual; it is used to notch out an item, like a nickel or penny. Can someone please explain the differences. And also explain that if I set the threshold on the NOX to a barely noticed hum wha

Sounds like you are overthinking it. The manual does cover it well... Park, Field, and Beach Threshold Park, Field, and Beach Modes use a simplified type of threshold tone, i.e. a 'reference' threshold. It is a continuous background tone that will blank when a rejected target is detected. Without a reference threshold, a rejected target detection would be silent, and you would not be made aware of the target's existence. For typical treasure detecting locations where there is often a