"Randy, I totally agree ... or at least so far as most 'typical' coinshooters preferring the X-Terra 30's 3-tone audio due to the 'grouping' of most higher-conductive coins into the single higher tone."... I AM a coin hunter, but I like to hit playground and similar high-use sites when I only have a little time and want to get a good deal of 'flash money' as well as have a good chance at gold and silver jewelry.
In 41 years of detecting I've enjoyed all types of "coin hunting" and really prefer to concentrate most of my serious "in-town" detecting in search of silver. You know, seeking out the oldest parks, schools, yards, fairgrounds, etc. and then going after the higher-conductive coins (penny/dime and above) that are 3"-4" deep or deeper.
If I could have my way, most of my "coin hunting" would be done at out-of-town locations, such as ghost towns, homesteads, old resort sites, pioneer & military encampment sites and the like.
But when I used the term "typical coin hunters" I was referring to the average, everyday person who buys a metal detector and only gets out now and then to the local park or school and cruises through the lawn in search of coins. Not researching older-use sites, and not trying to select the deeper and potentially older targets, just those who go anywhere "typically" used by humans where they might find modern money.
For them, most of whom never really learn their detector or want complexity, the X-Terra 30's turn-on-and-go ease of use will be complimented by providing a high tone for most of the desired targets (coins) with the exception of nickels. For them, the high-tone suggests they have discovered a target they are after.
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"However .. there are a few sites where quarters are in heavy use and, when time limits are tight, you can use the X-Terra 50 and cruise away listening primarily for the high tone from the shallower quarters."... Do I regularly do this? Nope! Do I do it on occasion or know of others who do? Most certainly!
Like I said, I am mainly interested in having fun and do that by seeking out potential SILVER or OLDER coins, or if I am going to go after "flash money" then it is in woodchip or sand-filled playgrounds where recovery is very fast and easy.
I have found plenty of coins in over four decades and with my health getting the better of me I like to not make work out of detecting if I can help it. This means I am not going to get down and go after what are most likely pennies and an occasional newer dime if I have to do a lot of probing and or plugging. If it is a newer high-use site that's very likely to have quarters in abundance, then I'd rather spend it going after them. The X-Terra 50's 4-tone audio provides that 'edge' so that I do not have to refer to the TID display all that often.
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"It does provide that measure of "cherry picking" for those times when you might have a high concentration of quarters and/or just too many blasted screwcaps that 'read' similar to the zinc cents and such."... We can't forget to comment, however, that the X-Terra 30 & 50 both have a segmented or notch discrimination design somewhat similar to Garrett's and that allows us to knock out a particular band or range or segment of annoying trash, and for some that could be the pennies.
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"I agree that it would be nice to be able to assign the various tones as we would like them, but that would defeat the benefit of having this much performance in such a handy and affordable package."... My brief post above was done to convey the message that, while it would be nice to have manual control of where be assigned the 'tone break' for the various audio tones, it would also add to the cost of the unit, and I am positive that it would add complexity to it, too, that would defeat the merits of a "turn-on-and-go" detector for many hobbyists.
That said, I find the X-Terra 30 and X-Terra 50 to have an audio tone design best suited for the potential buyer/user. A simpler 3-tone for the ready-to-go model, and a 4-ti=one audio for those who prefer to have a little more manual control and target information to learn and apply.
Now, it's back out for 1