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Discussion Starter · #1 ·
Anyone know what the sound is when you have your foot on the gas pedal and you can hear a "whistling" noise through the speakers? I just hooked up a stereo/speakers/amp, if that helps.
 

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glenn4dde said:
Anyone know what the sound is when you have your foot on the gas pedal and you can hear a "whistling" noise through the speakers? I just hooked up a stereo/speakers/amp, if that helps.

sounds like alternator whine.
 

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My guess is that your levels aren't matched properly. There is a certain level when the output of the deck and the input of the amp needs to be matched.
If not, you get a whine because the input voltage isn't enough for the amp.
Most people crank their gains on their amps to satisfy volume needs. However, this is not the correct way to do this.
We use a sign-wave generator at our shops so you can see when the wave starts to "square" and thereby match it.
If when you turn down your gains a little the noise goes away but you don't have enough volume. IMO you need a better amp.
 

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Discussion Starter · #4 ·
Thanks for the input. I am going to unplug my 'cheap' amp and see if that works.
 

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alternator whine

i've had some fun removing this from friends audio systems.

usually it was caused by the following:

Improperly routed wiring. the power and rca wires were zip tied and ran down the same side of the car causing inductance, and hence the whine.

Bad RCA cable or shorted cable.

other than that, its usually a bad componenet and you have to do process of elimination.

good luck
 

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Discussion Starter · #6 ·
The power and RCA's are running down the same side of the vehicle, I'm sure they are touching. I thought that is why I was buying more expensive power wire and RCA's...I wasn't expecting that kind of interference.
 

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glenn4dde said:
The power and RCA's are running down the same side of the vehicle, I'm sure they are touching. I thought that is why I was buying more expensive power wire and RCA's...I wasn't expecting that kind of interference.
Why is power running down the side of the vehicle? :confused: Alternator whine often can be a very simple and cheap fix but a bitch to figure out the cause. :cool:
 

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the noise is just interferance from the power wires being next to the rca's. If you move the two apart you should be ok. And why do you have the power wires running through the car when the battery is in the trunk?
 

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whiney sounds

hmm interesting. i was going to hook up mine to the battery in the trunk.

and my amp senses signal on the high power inputs and turns on automatically. so basically i only need to hook things up in the trunk.

i guess i'll have to see what happens. hey has anyone amped the stock sub?
any guess on the "ohm's"?

michael
 

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Discussion Starter · #10 ·
Ruppstar said:
Why is power running down the side of the vehicle? :confused: Alternator whine often can be a very simple and cheap fix but a bitch to figure out the cause. :cool:
Sorry, this is for my Grand Cherokee, not my 300. Thanks for all of your advice though. I finally turned the gain completely down because I couldn't stand it when the volume was at low levels. The 'whine' went away, but so did most of the volume.

I guess I need to re-route the power wire in order for the noise to go away. Oh well, that's gonna be a bitch.
 
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