It appears that people are brute force cranking down recovery speed and cranking up sensitivity to gain depth. This machine runs hot and it takes a little finesse to increase signal to noise ratio (NOT just the signal) which means: 1) You need to be in the right mode - if you want max depth on silvers and other high conductors, go with Park 1 or Field 1 which are biased to the lower weighted frequencies (i.e., higher conductors), 2) Get a sat Noise Cancel and GB (don't be afraid to use tracking if you have soil with mineralization that tracking can "grab" onto, otherwise go with auto or manual GB), 3) Don't try to maximize depth simply by upping gain/sensitivity because you will also be upping the noise floor. Keep it around 20, push it up maybe 2 points max and don't be afraid to push it down a couple of points if you are getting falsing - again, the goal is to get the machine to run quiet. 3) Don't just crank down on recovery speed to maximize depth, you may end up increasing ground noise on your swings and are then just lowering signal to noise ratio again because you are increasing the noise floor. 4) WHEN IN DOUBT, JUST STICK WITH (OR DON'T STRAY FAR FROM) THE MODE SETTING DEFAULTS - they work pretty well and have been established through extensive field testing.