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It's now a vegatable soup if idea and perhaps someone will land on something.
In an audio system the head unit (radio module) is elecronic, amp are electroic and speakers electro mechnaical. Working backwards.
Speakers fail mechnically if the surround (cone suspension) fails from dry rot. That's a visual check that it should be in tact and when you press the speaker keep the cone centered and stable. Second is the coils in the speaker could melt by being over driven, if that happens the speaker won't move. Third and less likely is the coils could break.
One simple test - and this is only possible if your + and - wires to the speakers are attaced via a spade connector, is to grab 16 guage length of wire with a + and - terminal, on one end attach spade connectors, hook to the speaker. On the other end have some bare wire. Then with a 9V battery (it the rectangular battery) hold one wire to one terminal and on the other terminal connect and disconnet the other end of bare wire to the battery. You should hear a clik or light pop sound. This in a simple way will allow you to know that each speaker has electrical function.
One step back from there is to find the amp. Remove the terminal block connector and whith a wiring diagram and if you can, pull the wires to each speaker and do the same test. This will let you know that there's electrical integrity in the wiring from the amp to each speaker.
I don't think this is the problem, but if you want to exhaust options, step 2 here would be next.
I still believe it's the amp or head unit in either case swap those out individually for other units and see if that does not clear it up.
Best of luck.
posted by 74.139.18...
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