getting some really LOUD engine noise in my subs!

[blaupunk 10+ year member]

I'll try it and let you know

thanks man

 

[Abunai 10+ year member]

Hmmm, if you arn't blocking the non-bass frequencies from your subs, it is most deffinatly a ground loop problem. You need to run what is called a "Common Ground" wire, by twisiting a wire with adaqute gauge (14-18, depending on your HU power) around your ground wire connecting one end to the ground on your HU and the other end to where your amp is grounded, in the same spot. I have done this numerous times and never fails.

 

[mr4pto 10+ year member]

Originally posted by Abunai Hmmm, if you arn't blocking the non-bass frequencies from your subs, it is most deffinatly a ground loop problem. You need to run what is called a "Common Ground" wire, by twisiting a wire with adaqute gauge (14-18, depending on your HU power) around your ground wire connecting one end to the ground on your HU and the other end to where your amp is grounded, in the same spot. I have done this numerous times and never fails.

What do you mean by you arn't blocking the non-bass frequencies from your subs ... are you saying the subs are playing mid range frequencies even though the crossovers are set??? What does grounded the HU in the same spot at the amps acomplish/ what problem(s) does this solve.

 

[indosia 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

If single point grounding is not practical, ground the head unit to the firewall. Avoid using factory power and ground wires for high powered head units. Often the wire is to small and it is clustered with other accesories.

 

[indosia 10+ year member]

Originally posted by mr4pto  

What do you mean by you arn't blocking the non-bass frequencies from your subs ... are you saying the subs are playing mid range frequencies even though the crossovers are set??? What does grounded the HU in the same spot at the amps acomplish/ what problem(s) does this solve.

A ground loop is more than one ground path where the differences in current potential of each path create a voltage differential . This is a common cause of noise in car audio. Using a single point ground will eliminate the possibility of a ground loop.

 

[chris229 10+ year member]

guys ------there is now way you can tell it is a ground loop from the noise it makes.. it could be---a power ground loop---a signal ground loop--loop area induction---capacitive induction--direct induct right into the HU or the amps---just too many things..PLUS it can be 1 problem OR all at once.. why don't we start simple with muting the amps---instead of randomly testing

 

[chris229 10+ year member]

l

 

[Abunai 10+ year member]

Setting your system up to have a common ground is just good practice, so it would be a good thing if he did it, and if it solves the noise, great, if it doesn't, his install is still professional.

 

[chris229 10+ year member]

Originally posted by Abunai Setting your system up to have a common ground is just good practice, so it would be a good thing if he did it, and if it solves the noise, great, if it doesn't, his install is still professional.

common ground with the HU isn't a good idea---as the signal source ground is through the HU

 

[Abunai 10+ year member]

Ok...how is that not the same exact thing.

 

[chris229 10+ year member]

Originally posted by Abunai Ok...how is that not the same exact thing.

what?

 

[indosia 10+ year member]

Originally posted by chris229 common ground with the HU isn't a good idea---as the signal source ground is through the HU

Explain

 

[chris229 10+ year member]

Originally posted by indosia Explain

The signal coming out of the HU is in reference to the ground that is ALSO coming out of the HU------this should be the only signal ground in the whole system----- the signal ground needs to see 0v -----if you put it in a high current path then the state of the ground will change with reguard to the amount of current flowing on that path[voltage drop]----any change in the state will turn into noise in the signal---

 

[chris229 10+ year member]

basicly -----if you put the HU ground in the path of alot of current ----that point isn't really a ground any more

 

[blaupunk 10+ year member]

Ok guys, i used muting plugs and the noise went away, so now what should i look for or try.

I even had a wire connecting both grounds and that didnt solve it

Thanks