getting some really LOUD engine noise in my subs!

[loudcar412s 10+ year member]

i have 2 polk 12's, a lanzar vibe 435 (i think thats right...?) 1000w amp. i had it in my blazer and got no engine noise (it was also with a much better cd player) and now we put them in my friends car and his engine noise is SO loud coming from the subs in the trunk.

what is causing this and how can i fix it?

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[indosia 10+ year member]

Engine noise is usually a high pitched whine coming from mids/tweets. Ground the head unit and amps to the same point. Make sure it's a good ground point. make sure the back of the headunit is not touhing metal.

 

[loudcar412s 10+ year member]

isnt there some kind of filter i can buy?

 

[chris229 10+ year member]

Originally posted by loudcar412s isnt there some kind of filter i can buy?

mute the amp and tell us what happens.

 

[loudcar412s 10+ year member]

it is only coming from the subs, but the amp i thought had a filter built into it.

 

[chris229 10+ year member]

Originally posted by loudcar412s it is only coming from the subs, but the amp i thought had a filter built into it.

it whines when you plug in muting plugs????

 

[blaupunk 10+ year member]

Originally posted by indosia Engine noise is usually a high pitched whine coming from mids/tweets. Ground the head unit and amps to the same point. Make sure it's a good ground point. make sure the back of the headunit is not touhing metal.

So what your saying is, i would have to run a cable all the way to my trunk were my amp is? Arent you supposed to make the ground cable as short as possible?

Please help

 

[chris229 10+ year member]

Originally posted by indosia Engine noise is usually a high pitched whine coming from mids/tweets. Ground the head unit and amps to the same point. Make sure it's a good ground point. make sure the back of the headunit is not touhing metal.

how do you know it is a signal ground loop?

 

[chris229 10+ year member]

Originally posted by blaupunk  

So what your saying is, i would have to run a cable all the way to my trunk were my amp is? Arent you supposed to make the ground cable as short as possible?

Please help

I can't help untill you mute the amp

 

[blaupunk 10+ year member]

Originally posted by chris229 it whines when you plug in muting plugs????

What do you mean when you say mute the amp? and what are muting plugs?

Thanks

 

[chris229 10+ year member]

Originally posted by blaupunk  

What do you mean when you say mute the amp? and what are muting plugs?

Thanks

shorted out RCA jacks----hack off some old RCA ends and connect the center prong wire to the outer shield wire. shorting out the plug. make enough for all channels of the noise making amp. plug em in and tell us what happens. Do you happen to know the source imedance of your HU?

 

[blaupunk 10+ year member]

Before i make some muting plugs, i thought you might want to know that when i disconnect the rca's runnin to the amp the whinning stops on my sub. So is that anyhelp? my HU is a Aiwa cdc-mp3 im not sure on the impedeance.

 

[chris229 10+ year member]

k--- move the HU to the back of the car and use gender connectors to plug the HU DIRECTLY into the amp. connect the HU positive and turn on and ground to the amp also ground the case of the HU the terminal too . Do you get noise???

 

[blaupunk 10+ year member]

What exactly do you mean by gender connectors?

 

[chris229 10+ year member]

Originally posted by blaupunk What exactly do you mean by gender connectors?

you know them plugs with 2 male ends -------you plug the gender connector into the HU rcas ---so you can plug the HU directly into the amp