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Old 01-16-2019, 02:28 PM   #1
hvstorck
 
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radio speaker static

Recently I started getting noise thru one of my overhead speakers as the engine revs increase when accelerating. Not a problem if just cruising.It occurs even with the radio off and volume at zero. Any ideas to correct would be greatly appreciated. TIA!
Harvey
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Old 01-17-2019, 09:56 AM   #2
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That sounds like an alternator whine. If it just started, you may be repairing or replacing the alternator or regulator before long. It could also be a loose connection in the charging circuit and most probably on the negative side. I'd start by checking all the grounds from the engine/alternator to the frame.
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Old 01-17-2019, 10:29 AM   #3
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I run into this all the time in car audio. usually its a ground loop issue (lots of grounds/poor grounds). does this happen while listening to the radio or from another source? is there a separate amp in the mix? you may need a ground loop isolator. they come in both RCA connections and 3.5mm connections and antenna. very inexpensive.
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Old 01-17-2019, 03:47 PM   #4
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Thanks for the replys guys. IsleDog- It does happen while listening to radio, but only when we are moving and accelerating. No seperate amp. Thanks again.
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Old 01-17-2019, 03:56 PM   #5
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Quote:
Originally Posted by hvstorck View Post
Thanks for the replys guys. IsleDog- It does happen while listening to radio, but only when we are moving and accelerating. No seperate amp. Thanks again.

this is lifted right from Crutchfield. the unit listed below is no longer available. this is the replacement.
https://www.crutchfield.com/p_120ANR...X-ANR1000.html

Full article.
https://www.crutchfield.com/S-STl27C...ion_guide.html

Engine noise
Noise introduced through the power and ground wires connected to your receiver is called engine noise (sometimes referred to as “backway noise”). If engine noise is your culprit, you may hear a whining or clicking sound. Its pitch will usually vary with engine speed.

If this is the case, you can install an alternator noise filter on the power line between the battery and the alternator to minimize the problem. You can also install a noise filter on the receiver's power lead to cut down on signal pollution (American International's S15A (15-amp, 250-watt) or S25A (25-amp, 350-watt) filters, for example). Most often, however, backway noise comes from a loose or intermittent ground connection.
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Old 01-17-2019, 04:11 PM   #6
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IsleDog,
Thanks again! who do you think I should turn to for help? Auto stereo installers?
Harvey
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Old 01-17-2019, 04:18 PM   #7
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IsleDog,
Thanks again! who do you think I should turn to for help? Auto stereo installers?
Harvey
that would be my first go to if you are not comfortable playing with wires. im not sure that the dealer or manufacturer could resolve this issue properly. the car audio guys do this day in and day out. you will want one of the independent locations, not something like bestbuy. read reviews of your local shops. there are a lot of hacks out there.
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Old 01-17-2019, 04:24 PM   #8
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IsleDog,
Thanks again! Gives me a course of action.
Harvey
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Old 01-17-2019, 06:08 PM   #9
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Remove the power supplying the radio and hook it to a separate battery if you happen to have one. That way you can isolate it to coming from the power from your RV or something getting radiated in.


Personally, most audio guys just throw on bandaids(line filter) rather than actually fixing the cause of the problem. There could be be many causes from an alternator that has a blown diode to a bad spark plug wire or other ignition issues.
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Old 01-17-2019, 08:50 PM   #10
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a bad spark plug wire or other ignition issues
Yeah, that's probably it.

hvstorck, which model Berk do you have?
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