I've been an avid detectorist since 1972. Over that course of time, I've had a lot of various detectors and headphones. The older BFO's made noise all the time. And some of the earlier headphones I had didn't have volume controls. I should add that I worked in communications and spent years listening to 1000 cycle tones and test equipment. I've also shot more than my share of shotguns, rifles and handguns. To say definitively that the sounds coming from my detector is what has causes that damn noise in my ears is not possible. But I suspect it has been one of the contributing factors. Now when I detect, I only use headphones with volume controls. And I've learned to lower the Threshold so that it is just barely audible. Sometimes I'll even drop it down one setting from there. I prefer having a "barely quiet" threshold compared to running a "zero" threshold because I know it won't take much of a target to break through that threshold setting and provide me an audible target tone. With the CTX, I prefer to hunt in Combined mode as it allows me to adjust the tone frequency for each target bin to something that I can hear well and isn't annoying. Listening for those five tones, along with those damned crickets, is about all I want to hear when I'm out detecting. JMHO HH Randy