The product worked straight away on my Cobra 200, that damn buzzard radio blew out a few speakers in its day, it's not juvenile. didn't solder it radeeeeeio, and after a few seconds the sound started buzzing and knocking, how to tell you have a bad speaker? EZ pee zeeeee connect the 9V wires to the back of the speaker terminals. If the speaker makes a little click, it's good. If the speaker doesn't do anything, the speaker needs to be replaced, yes replace it
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