XP Metal Detectors Gmaxx II Instruction Manual - page 12

C O N T R O L S  

5 

IRON

THRESHOLD________________________________ 

The GMAXX II is still "multi-tone" detectors, but users 

can now adjust the iron level setting by using the IRON 

THRESHOLD potentiometer. 

This potentiometer can be viewed as a detection 

setting with a range only covering iron. It has fine-

tuning settings ranging from 0 to 10. 

At 0, all iron sounds at medium pitch. The higher the setting, the 

lower the pitch for detected iron.  

This, for example, enables small nails just to be picked up at a low 

pitch, whereas larger ones will be detected at medium pitch.  

As you will doubtless already know, too high a level of 

discrimination can hinder the performance of a detector.  

This setting was previously only arbitrarily preset to be suited to the 

majority of users. But most of the time, beginners do not want iron 

to register on their machines, whereas more advanced users prefer 

to have this detection option to make it easier to pinpoint coins on 

difficult terrain.  

Use the Auto mode if you do not wish to trouble you 

about the parameter setting of this potentiometer, it will 

allow you to have a comfortable rejection of ferrous.  

By default, the GMAXX II is a triple-tone 

detector, but users can set it to double tone 

mode using a SILENCER switch: 

Switch the SILENCER from position I to position II twice 

within the space of two seconds. Your machine will 

then be in Double-Tone LOW / MEDIUM mode, or in 

MEDIUM Mono-Tone mode if the IRON THRESHOLD 

potentiometer is set at minimum. 

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