I've got a question for you and your Excal-
Is it quiet during the hunt and only makes noise over a target, or is there a constant wavering sound and you listen for the difference in the noise?
My Sand Shark and the Infinium both make a lot of noise that I can't get rid of in the salt water- both PI machines.
Sweep the coil and they both sing, and then change tones on the back sweep.
I'm wondering about yours...
its a constant hum/buzz mosquito like but if you sweep over iron it will null out or a low growl then you can just leave it like that or move the coil next to your scoop (mines aluminum)
then it goes back to the normal hum. I don't bother any more if I go over iron and just let it growl until I hit a good target. I hope I explained that correctly.