This one has not been asked, I checked....
I usually have a CB in the car, and when I have passengers (children) I use an earphone so I don't have to explain the colorful language to the kids.
My last radio, a Uniden 510, had a "pop" when squelch was broken, such that in a headphone it was uncomfortable. The PC 122XL that pre dated it didn't "pop".
I'm looking at spending the huge $35 that either a 510 or a Cobra 19 will cost. Does anyone have any experience with them and a headphone ? I'm not looking to match my Icom 7000, just want squelch to break without "pop" in the headphones.