I feel your pain...
Greetings,
I have a Quicksilver also, really a Pioner EX from wally-world, same thing and no headphone jack.
I have been detecting when I can for maybe a total of 20 hours, so far, and I have learned a couple of things that might be useful.
My first target was a piece of aluminum siding. Not great, but I did locate a piece of metal buried in the ground and dug it up so, yea me.
Then, as I recall, the next several targets were junk and trash also.
Not real discouraging, however , because I just figured I just was not looking where the coins were.
Eventually, I hit a small tot lot and found a penny, then a quarter, then more coins as as I kept at it and hit some other places.
Total clad count to date is about $14.00, including my one and only silver, a 1936 winged liberty head dime, also known as a Merc.
I definitely will upgrade to a more advanced unit soon, but for right now, it seems to be working ok.
I have not found great depth with this unit, but with good batteries I have dug a few coins at about 6 inches.
When you say hubby is picking up cans I will have to agree because it seems I have about a mile depth when it comes to those things and bigger pieces of junk metal.
I carry my detector with me wherever I go so I just went out and threw a few coins on the ground to do a little test to compare to his unit.
A zinc penny showed up under zinc
A copper penny came up as the highest tone and it was under coins.
A quarter and a dime (clad) showed up under coins also.
The nickel did come up under nickle just about every time I swept it.
If a nickel shows up under coins I am guessing it might be due to soil conditions or maybe yours is not calibrated from the factory correctly, if that is even possible.
Maybe the coil wire is a little loose and flopping...I have heard that can give some false tones too.
The only advice I can give is the same as everyone's...just keep plugging away and digging.
At least he is getting some practice digging holes.
( Insert and sing, Always look on the bright side of life by Monty Python, here ).
Here are a few of my posts since I started ths wonderful hobby.
Maybe they might be useful since it seems not many people here use this particular detector.
Hope it helps!
HH
Digger27 (David)
http://metaldetectingforum.com/showthread.php?t=43239
http://metaldetectingforum.com/showthread.php?t=43758
http://metaldetectingforum.com/showthread.php?t=44544
http://metaldetectingforum.com/showthread.php?t=45344
http://metaldetectingforum.com/showthread.php?t=45632