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Old 01-17-2014, 08:07 AM   #1
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Weird sound coming from Subwoofer

I have a 12 inch Dual brand subwoofer with a 400 Watt Dual brand amp in the back of my 91 YJ. When I turn on the Jeep I hear a whine coming from the subwoofer that increases in pitch with RPMs of the engine. Is this in my wiring or should I look somewhere else?

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Old 01-17-2014, 08:21 AM   #2
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It is in the wireing, hu or amp.

How did you run the RCA's in respect to the power wire?

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Old 01-17-2014, 08:41 AM   #3
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I'm not exactly sure what you're asking..
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Old 01-17-2014, 08:46 AM   #4
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If the RCAs are ran down the same side as the power cable, that can cause the interference. Usually it's not noticeable in a sub, only when you have an amp on your mids and highs, although it's possible.. You probably have a bad or a loose ground. Check where the amp is grounded and make sure the paint is cleaned off and it's attached very securely to bare metal. Also make sure the ground isn't ten feet long.. The shorter the better. I usually make my ground wire about 3-5", mounting location permitting. If neither of these issues are the case, it's possibly the amp. Unfortunately it's a "value" brand and you get what you pay for. Not trying to be rude, just honest. I've seen a lot of those amps and subs go out while I was in the 12v industry.

Also, check that your radio has a good ground, because if not, it can actually pull it's ground from the antenna or the RCAs which could definitely cause interference and ultimately will kill your radio.
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Old 01-17-2014, 12:16 PM   #5
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check your sources and see what maybe causing the noise. If all sources cause the noise then the radio could be the problem.

If you only hear the noise through the amped speaker, I would check the ground, and make sure it is bare. If all else fails you can get a noise suppressor. I actually brought three of them, and I was able to trace my Aux source on my radio as the culprit, and I zapped it with a line noise suppressor.

The trick is to determine exactly what in the audio system is causing the noise.

Crutchfield says the same thing that I am saying. And they have a lot of additional information on diagnosing the problem.

"Are you hearing engine noise?

Any amp installation can be prone to engine noise. You may hear a whining or clicking sound (its pitch will vary with engine speed). Since most noise problems come from a poor ground, always make sure your ground wire is connected firmly to bare metal in the event of a noise problem. You can also try isolating your amp from the chassis of your vehicle by mounting it on a board or using rubber grommets or feet; using a different brand of patch cables; or, only if all else fails, installing a noise suppressor . The tricky part is figuring out which step or steps to take. Please read the rest of this section and try some of the simple tests."


Noise Suppression Guide - Noise Suppression Guide
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Old 01-19-2014, 08:52 PM   #6
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Great!! Thanks for the info I'll check the ground.

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