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Old 01-14-2011, 05:50 AM   #1
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Intermittent speaker

I have an occasional problem with my factory Sony sound system. The speaker nearest the door drops down in volume intermittently. To restore it to normal volume, I turn the volume up quickly. That works, but can you suggest how to fix this gremlin? Is this a tuner, speaker wire or speaker problem? Thanks, John
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Old 01-14-2011, 06:54 AM   #2
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I'm going to venture an opinion that it's likely a speaker wire connection issue, or the wire is connected fine, but grounding out on the chassis somewhere. I have fixed this specific problem on a couple of vehicles I have owned over the years.

I suspect turning the volume up quickly increases the vibration at the speaker and causes the wire connection to settle back in place temporarily. Maybe start by checking connections and an electrical multi-meter would help you determine if there is a ground or short in the wire.
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Old 01-14-2011, 08:53 AM   #3
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If the radio has a knob that you turn for the volume, it could also be a bad potentiometer in the radio itself. The way to determine if it's the radio, or the wiring to the speaker, is check the volume of the same side speaker in the rear when the volume has gone down. If the volume is low in the rear at the same time the volume is low in the front, I would guess it's the radio, unless the wiring is in intermittent short, in which case the symtom would be the same.
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Old 01-14-2011, 05:43 PM   #4
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Thanks Kevin and Steve.
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Old 01-14-2011, 06:22 PM   #5
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Failing that, I believe it could be a cold solder joint. This would mean spending a little time with the "Instant Cold" spray and a hot soldering iron to try and find it. Heat up a solder joint, cool it down. And again. You get the idea.

Or, you could spend days in the same way.

Bona fortuna. An intermittent fault is always the hardest to find...
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Old 01-14-2011, 06:37 PM   #6
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Not sure if this could be the same thing. But I had this problem on my 79 Argosy. It turns out the back of the speaker was touching the outer skin. I added some tape to the back of the speaker and the problem was solved.
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