I have about 75 hrs on the Equinox and have never had a dime hit in the range you describe. Chirping can be a lot of things, as Steve has said, including sensitivity, EMI and a really trashy area. I hunt an old park where in all metal setting I get 5 to 10 hits per swing so the detector is chirping all the time. This detector sees a lot more in the ground than my etrac.
i would be concerned about high conductors showing 12-14