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loud buzzing sound (alternator whine?)

GiJOr33

By GiJOr33,
in Car Audio & Electrical

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GiJOr33 Experienced

GiJOr33

Posted
Posted

It's the traditional whine sound from all the speakers which rises in pitch when you accelerate/rev the engine. What are the measures i need to take to get rid of it?

I've got an Alpine CVA1000, EQ, 4ch Amp, and stacker... the stacker, eq and headunit are connected via Alpine's Ai-NET, and from the eq to the amp it's RCA's. The RCA leads have a ground cable at each end which i presume grounds the shielding. I don't think there is a noise filter on the alternator (so i spose i should get one of them to start with), I do have the power cable running next to the RCA's due to the difficulty of placing them separately.

The sound happens on all sources eg radio or cd player.

What measures can i take apart from moving the power cable to the other side of the car and putting in an alternator noise filter (actually, what type is the best one to get, and how big?)

--

Thanks,

Andrew

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GiJOr33 Experienced

GiJOr33

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  • Author
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the earthing of what? the amp? Cos i sanded the metal surface back that it was going to touch to make sure there was good contact. RCA's cost me $40 each... so i would expect them to be decent.

What about the size of the Negative Battery cable? should i perhaps replace it with a bigger one? like a 4ga cable?

d0p3y Grand Master

d0p3y

Posted
Posted

Try earthing it in a different place, sometimes if u earth it in a certain spot you can get engine noise

(yes the amp earthing)

may be a good idea to check FAQ's at www.caraudioaustralia.com

The Tool Enthusiast

The Tool

Posted
Posted

is most likely to be either poor earthing or a poor contact/connection somewhere - make sure all your terminals are secured well and have good contacts.

also i hope you aren't running the headunit, stacker & amp all off the same power cable - it is best to run amps on seperate cable.

is your battery in the boot? if so, try running the amp straight off these terminals.

out of curiosity, what size power + earth cable are you running?

GiJOr33 Experienced

GiJOr33

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  • Author
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I sort of found the problem... i have the excess RCA cables bunched up and cable tied in the boot, the power cable from the battery (i have one for each amp, 8ga for both the power and earth). I moved the RCA's a little and the noise went away... and since putting everything back in the car it has come back a little (not as loud as it was)... grrrrr... so i'm gonna chuck a supressor on the alternator to see if that does anything to remove the little bit of noise, otherwise i'm going to have to pull out the back seats again and see if i can relocate the bundled RCA leads.

  • 3 weeks later...
funkymonkey Grand Master

funkymonkey

Posted
Posted

hmm i got that noise too, but before that my sub always popped, when i tore things apart i found out that it had been earthed on an area with a thin layer of paint. so i scratched the paint off a lil and re-earthed and the popping stopped... now all i have to do is get rid of the whine.

GiJOr33 Experienced

GiJOr33

Posted
  • Author
Posted

Nah, haven't had time to sort it yet... mine are in the RCA's, they are running a little close to the power cable.

Perhaps check your RCA's from the deck to your amp (if you have them), if not, then i don't know how to get rid of the whine... perhaps put a supressor on the alternator.

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