"Noise "only from back connector

seninha · 04-02-2006, 02:19 PM

Yesterday I finally had the time to place my case there where I wanted (in the trunk)
Last 3 weeks I was driving with the PC case on the passangers floor.
Unitl yesterday every was running well. Sound was good without any problem.

But now I have a really strange problem.

I use a 4.1 PCI soundcard. The front speakers are connected to the front-out, and the back speakers to the rear-out put.
If I connect the jack in the rearout-put I hear a very strange noise when the music is off.
When the front jack is connected to thr front-output the sound is not here.
Because I wanted to be shure the the problem came from the cables (maybe running to close to the power cables, I connected the front jack in to the rear out-put. Noise then came back

If I connect the rear jack in to the front out-put noise is gone.

So what I think is that the rear out-put conector is the problem.
Because If it was one of the cables I would have this noise also when I connected the jack in the front-output.

So this is the problem:

frontjack in front out-put , no problem
front jack in rear out-put, NOISE
rear jack in front out-put, no problem
rear jack in rear out-put , NOISE

What could cause this NOISE.

Case Is grounded through the M1-ATX powersupply. This one is connected to the ground of the car.

Like I said, befaore I moved the case the problem wasn't there

DaveB · 04-02-2006, 02:23 PM

Is there an onstar box or anything else in your trunk which might give off RF?

seninha · 04-02-2006, 02:26 PM

In the back there is nothing close to the PC.

DaveB · 04-02-2006, 02:34 PM

I don't think its the connector. The only thing that changed was you moved where the PC was located. That means, I assume, you rerouted the wires when you moved the PC. Do you get the noise both when the engine is running AND when the engine is turned off?

seninha · 04-02-2006, 02:43 PM

Yes, Both. Doesn't matter if the engines is on or off

DaveB · 04-02-2006, 04:00 PM

What is the brand and model number of the sound card?

Cris · 04-02-2006, 04:41 PM

I'm assuiming you kept the powerline and signal lines serate, right?

JC-S60 · 04-02-2006, 05:01 PM

Could it be the ground of one of your cables is fubar'd?

Are you sure you are using the output jack and not a line-in?

DaveB · 04-02-2006, 09:04 PM

Quote: Originally Posted by JC-S60

Could it be the ground of one of your cables is fubar'd?

Are you sure you are using the output jack and not a line-in?

I was thinking the same thing about the wrong jack. Thats why I asked what model sound card he had...

seninha · 04-03-2006, 02:45 AM

Soundcard is a Sweex 4.1 . I use the black out-put as REAR one, and green as FRONT.

Cables are running next to each other.
If thats a problem why does the NOISE not come up when I connect the FRONT output only.
Thats why I want to find out if the proble lies somewhere else

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