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Threshold is established at barely audible. This is a universal level accepted by most all because? It allows you to hear low volume tones better? tones in general?
Don't know about that! I run Gain on my XS at 10 using Fast On with my Sensitivity set to 22 Semi-Auto with Iron Mask -10 and have been getting a lot of Coins in the 10"-12" Range. I could see too High of Sensitivity in Iron or Trashy Sites but I doubt Gain would cause lack of Depth. Gain adjustment is for user's if they want to hear Deeper Targets that sound off with a lower volume signal so you can tell that the Target is Deeper without looking at the Depth Meter. I prefer 10 since then I have the best chance of hearing the Ultra Deep Signals that might not be heard if running at say 6 and I want to get the most Signal out of each Target I come across so I leave little behind. Just something to think about! Works for me anyways!
I use the barely Audible Threshold since I use Conduct Tones and run with Iron Mask -10. Using the background Threshold Hum, you will be able to hear Iron which will then Null under your Coil and you will have a better idea how much Iron is in the ground versus Trash and Coins present. The more Iron, the Slower I go so I can try and pick up Targets next to Iron. It would drive me nuts not knowing if there was Iron under the Coil while I detected if I didn't use a Threshold Hum. Hope this helps! Good Luck and HH to you.
Got the gain part. understood. not sure i get the threshold part. You say you'd go crazy not knowing if there was iron under the coil. So , if you had no hum, you would hear no nulling and have no idea that there was iron present. This would cause you to be a bit more careless assuming that there were no targets as you will slow down in the iron to hear anything hiding....is this correct?
Just not knowing how much Iron Content is at the site would drive me bonkers! Knowing Iron is present will make you slow down your swing speed and possibly get you to change settings such as if you were running Deep On, then you would want to run Fast On instead so you get a faster response from your detector. You would also most likely lower your Sensitivity if you are running it high since it would then loose Depth ran too high. As long as I hear the Hum in the Background, I know the ground beneath my Coil is clean and clear of Targets. Hope this helps! Good Luck and HH!
I understand there is a difference between these 2 settings. Just trying to clarify why there is a consensus on barely audible threshold hum. Now I realize why one would want this feature on a a level as low as possible.
The other gentleman was very helpful in explaining how to maximize opportunities whilst in Iron territory.
If you come across where an Old Building once sat and had the Background Hum, it would go totally silent until you got past the area where the Building was due to all the Nails and debris. Helps in locating where Buildings were on Old Farm Sites where there is just field now so you can concentrate more around these areas for lost Coins, Relics, Jewelery or what have you. Good Luck and HH to you.
what's meant by semi-auto sensitivity. i have been changing mine on the screen when i get ready to detect. is there a setting for semi-auto sensitivity. thanks.
If there is just a number shown (sensitivity setting)...and there is no line going around it...then you are in manual sensitivity.
Just push the button next to the sensitivity number to change back and forth.
If there is just a number with no line circling it then you are in manual.
Semi auto helps to deal with ground conditions automatically and seems to make the machine more stable.
The reason most people elect a just audioable threshold is those deeper and weaker signals have to be able to BREAK THE THRESHOLD to be heard. If you run it too loud you wont hear the weak signals over the threshold and noise. On the other had if you run it silent you wont hear what the machine is doing and be able to adjust it properly... such as sensitivity or conductive to ferr in trashy areas. You want a really great explination of this order Jeff Fosters book on digging deeper with the DFX. Its packed full of valuable information on how the detector functions and really in a must read regardless of the detector you use. James and the others did a great job explaining GAIN. Its also mondulation... making weak signals sound weak and high ones louder based on how you set it. The lower the number... say 6 the easier it is to distinguish 3" from 10" barried targets.
Works for me anyways! 
Hope this helps! Good Luck and HH to you.
