The monitor function is turned on, on the unit that is noisy.
The manual describes the procedure for setting the monitor function the manual is available here. https://www.cobra.com/support/product-manuals
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With nothing plugged in and the noise still there it most likely the output stage of the amp. If the unit is under warranty - tag it, bag it, and send it back for a new one. If not under warranty, you should remove the chassis and inspect for anything loose and spray the guts with zero residue contact cleaner. Use the cleaner liberally. Usually these output noises are the result of loose or dirty components. Clean all the electronics, put it back together and see if that doesn't get rid of the noise.
Good Luck!
Chad
You didn't say whether it was one or both channels. The word to describe the noise when using a turntable, back in the days, is called Acoustic Vibration. Your issue is not that. I can be an amplifier oscillating, for the high pitched sound and the crackling could be DC Offset*meaning a damaged amplifier) If you need further assistance, or would like to inquire about a repair, please visit my website at audioserviceclinic.com. Thank you.
The loud " Crackling noise is you hands , moving from one place to another on the cam ! "
I too have this problem with my cam..It is Inherent,its the powerful mike they have.
if the loud crackle noise is in the speaker that doesnt work you may have a problem with the balance control itself or int. contacts in the switchbank.clean and lube both for starters.
If you have lost your freeview channels & your picture has been breaking up (pixelating / freezing) etc as well as crackle on the audio, then I would suspect you check your antenna, it could be your incoming signal is weak which would give you these problems.
I can't take credit for this because on found on a review on Amazon.Com, but I tried it and it works!
"Another update, for everyone who is having the common crackling
problem, if you open the clock radio there is a black disk on the
bottom with a red and black wire coming out of it. This black disk is a
component called a piezo disk. They are commonly used to make noise for
buzzers in electronic devices, but appear to have no use whatsoever in
this clock radio. If you cut the wires going to this disk, the
crackling noise goes away. You can still use both buzzer and radio
alarms. There doesn't appear to be any functionality lost other than
the annoying crackling sound. Obviously cutting wires would probably
void your warranty, but do you really want to try your luck with
another RCA clock radio? Chances are the crackling will happen again
with the replacement or it will be DOA."
If you can handle a screwdriver and a pair of scissors, you can easily tackle this project, don't be worried about it being too complex. 5 screws, a snip, and you are all set. Make sure the radio is unplugged of course.
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