For additional depth of the Whites Spectrum XLT the three most important functions are; A. C. Sensitivity, V. D. I. Sensitivity, Pre-Amp Gain, with Pre-Amp Gain being the most important.

(1) – Start in Factory Pre-Set Relic Mode or Coin Mode.

(2) – Go Basic Adjustments to A. C. Sensitivity, then [increase some]. Then squeeze and release trigger and Air/Ground Balance, and then return to the last menu.

(3) – Go Pro Options to Display to V. D. I. Sensitivity, then [Increase some]. Then squeeze and release trigger and Air/Ground Balance, and then return to the last menu.

(4) – Go Pro Options to Signal to Pre-Amp Gain, then [Increase some]. Then squeeze and release trigger and Air/Ground Balance, and then return to the last menu.

(5) – Save in Custom Program (Renaming the Custom Program is optional)

Just make sure your threshold tone is constant that is why no increase values are given for items (2) thru (4). Personally, for the time being, I have only increased my AC Sensitivity by 4 to 68, and Pre-Amp gain by 4 to 6 and seems to be stable in my soil conditions with at least two more inches in depth. I hunt for CW Relics, but should work for coins as well if you start in the Factory Pre-Set Coin Mode.

In high mineralized soil Increase Pre-Amp Gain up to 4 or 5, then decrease AC Sensitivity down to 55 to 60 for stability

Do not forget to re-ground balance after increasing each of these functions by trigger squeeze, release, then press Enter, then balance, and then return to the last menu.

Go to and study Monte’s XLT programs on JB's Metal Detecting Resource Site At http://members.xoom.com/NetSurfer/course1.html

A good book in additional to the manual is Spectrum XLT by Daryl J. R. Townley for about $9.50 and can be ordered from Whites.