MP3Car.com - View Single Post - JL Audio System Noise --- Help!!!

greatwhite · 03-24-2008, 05:55 PM

Quote: Originally Posted by saounyang

-Doesn't change with engine speed. It is not there when engine is off. Does not matter if components are off/on. RCA wires are parallel w/ power cables except the Rem cable. Thanks so far man!

Well, that's some progress.

If it doesn't change with engine speed, it's not alternator whine. Same with fan, AC, etc.

Not there when the engine is off indicates it's something grounding out through your audio equipment or there might be some noise induced into your rca's from the power wires.

Try seperating your power and signal wires and see what happens.

Something that a lot of people forget is that modern cars all have electric fuel pumps and they've got to me some of the "noisy-est" motors I've even dealt with. Installing your equipment, running wires parrallel to the power path or grounding near it usually produces mind numbing noise you can't seem to find no matter what tricks you use. If you've grounded your system under the rear seat this could also be a problem as that's where most modern cars have thier fuel tank and thus, the fuel pump and harness.

Grounding your components to the same point is usually good advice, it's makes all the gound paths equal in resistance, but it's not always the cure.

I've moved a ground point 6 inche before and cured a ground noise, sometimes it's just that simple.

The quality of your components might also be an issue if you have lower end stuff (amps, connections etc). There's a noise "floor" in every piece of audio equipment. Cheaper stuf fis usually noiser.......

Cheers

03-24-2008, 05:55 PM	#8
greatwhite FLAC Join Date: May 2007 Location: Top o' the world Ma! Posts: 1,269	Quote: Originally Posted by saounyang -Doesn't change with engine speed. It is not there when engine is off. Does not matter if components are off/on. RCA wires are parallel w/ power cables except the Rem cable. Thanks so far man! Well, that's some progress. If it doesn't change with engine speed, it's not alternator whine. Same with fan, AC, etc. Not there when the engine is off indicates it's something grounding out through your audio equipment or there might be some noise induced into your rca's from the power wires. Try seperating your power and signal wires and see what happens. Something that a lot of people forget is that modern cars all have electric fuel pumps and they've got to me some of the "noisy-est" motors I've even dealt with. Installing your equipment, running wires parrallel to the power path or grounding near it usually produces mind numbing noise you can't seem to find no matter what tricks you use. If you've grounded your system under the rear seat this could also be a problem as that's where most modern cars have thier fuel tank and thus, the fuel pump and harness. Grounding your components to the same point is usually good advice, it's makes all the gound paths equal in resistance, but it's not always the cure. I've moved a ground point 6 inche before and cured a ground noise, sometimes it's just that simple. The quality of your components might also be an issue if you have lower end stuff (amps, connections etc). There's a noise "floor" in every piece of audio equipment. Cheaper stuf fis usually noiser....... Cheers __________________ For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return. Leonardo Da Vinci Last edited by greatwhite; 03-24-2008 at 05:59 PM.