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03-28-2006, 05:25 PM
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#1
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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HDD&Engine noise, only with the carpc
This is how I have my sound:
Carpc in the back --> quality RCA cable to aux input from the HU upfront --> quaility RCA cables to amp with sub in the back.
I have all power wires through the left side, signal wires on the right side, USB/VGA/AV through the middle. Ofcourse, they all meet up in the back... 
All wires used are high quality wires.
I have a good grounding point, down to bare metal (one for both carpc and amp).
I tried to groung the case, no luck. Tried a ground loop isolator, still no luck. Also tried a USB soundcard, still no luck.
The HDD&Engine noise is present through ALL the speakers. It's also present without RCA leads or the VGA cables plugged in.
I'd also like to mention that with the Radio or CD, the noise is NOT present.  Also, the noise isn't that high in level, so the sound is good, but it shouldn't be there.
So, Red, and other Car Audio gurus, what else can I do?
Last edited by Cris; 03-28-2006 at 05:27 PM.
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03-28-2006, 05:33 PM
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#2
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Raw Wave
Join Date: Oct 2004
Posts: 3,294
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<ot>when did you get another car?</ot>
try grounding pc & amp to the same spot?
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03-28-2006, 06:02 PM
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#3
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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Quote: Originally Posted by tj!2k4
<ot>when did you get another car?</ot>
try grounding pc & amp to the same spot?
I got rid of the Megane a long time ago, and got a good deal on an Astra in the meantime. Still saving up for my dream car, the latest 5 series... 
The PC has always been in the Escort.
They are both grouded in the same spot. I tried grounding them to different ponts but no luck.
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03-29-2006, 07:32 AM
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#4
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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03-29-2006, 07:41 AM
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#5
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_
Join Date: Mar 2004
Location: Little Elm, Texas
Posts: 13,481
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some HUs have an aux input level adjustment - if youre HU does, check that
also, try and ground EVERYTHING to the same point, HU/Computer/Amplifiers/etc
there's also the chance that the RCAs from the HU back to the amplifiers are carrying some noise. (another reason optical is preferred IMO)
let us know about these possibilities!
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03-29-2006, 08:02 AM
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#6
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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Quote: Originally Posted by Red GTi VR6
some HUs have an aux input level adjustment - if youre HU does, check that
No, it doesn't. It's a Panasonic CQ-7300N.
Quote: Originally Posted by Red GTi VR6
also, try and ground EVERYTHING to the same point, HU/Computer/Amplifiers/etc
Everything is connected to the same point...
Quote: Originally Posted by Red GTi VR6
there's also the chance that the RCAs from the HU back to the amplifiers are carrying some noise. (another reason optical is preferred IMO)
let us know about these possibilities!
I'm not sure, because the noise isn't present with the Radio or CD. I'm thinking more likely it's the RCA cable comming from the carpc to the aux input of the HU.
As I said, the noise is still there even without the RCA leads plugged in...
Also, the speaker cables have all been replaced by high quality cables...
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03-29-2006, 08:14 AM
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#7
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FLAC
Join Date: Feb 2006
Location: London, UK
Posts: 1,280
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have you tried standing on your head? 
do you mean the noise is still there without the RCA's plugged in to the carputer but still into the HU, or not into the HU at all?
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03-29-2006, 03:13 PM
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#8
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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Quote: Originally Posted by sama
have you tried standing on your head?
do you mean the noise is still there without the RCA's plugged in to the carputer but still into the HU, or not into the HU at all?
Yes the noise is still there without the RCA's plugged in to the carputer...
I can't get the RCAs out of the HU becuase I can't reach them...
I tried standing on my head, it just made it worse...
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03-29-2006, 04:46 PM
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#9
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FLAC
Join Date: Feb 2006
Location: London, UK
Posts: 1,280
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I recon the long lead is picking up noise from somwehere else. perhaps there's a wire (fuel pump maybe) that's running parallel to the RCA cable somewhere.
you want to try to keep audio lines at least 8" away from power lines.
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03-29-2006, 04:48 PM
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#10
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FLAC
Join Date: Feb 2006
Location: London, UK
Posts: 1,280
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mp3car forums have spazed out
Last edited by sama; 03-29-2006 at 04:51 PM.
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03-30-2006, 10:29 AM
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#11
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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Quote: Originally Posted by sama
I recon the long lead is picking up noise from somwehere else. perhaps there's a wire (fuel pump maybe) that's running parallel to the RCA cable somewhere.
you want to try to keep audio lines at least 8" away from power lines.
Could be, as the fule tank is right under the back seat, and as far as I know the ful pump is somwhere close to the tank.
I too think it's the RCA leads picking up noise from somewhere, but unfortunatly there's nothing I can do to relocate them, as the whole car is full of wires...Perhaps I could pull them out to the front and see if the noise is still there...thus getting them out the fuel pump's range or other electrical devices in the back...
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03-30-2006, 10:47 AM
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#12
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FLAC
Join Date: Feb 2006
Location: London, UK
Posts: 1,280
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that's a good idea. if you don't get noise, then keep laying the cable slowly along the path it's currently in, until you get the noise. that will tell you where abouts your noise is coming from. Perhaps then you can sheild that? maybe some lead as it's soft. no idea where u'd get it!
shave a load of pencils
or maybe replace the rca cable wihta custom made one that is made up of 2 twisted pairs. may not offer the same quality as a full on OFC cable, but hey what's better? OFC + whine or non-OFC + no-or-less-whine? 
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03-30-2006, 10:58 AM
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#13
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_
Join Date: Mar 2004
Location: Little Elm, Texas
Posts: 13,481
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what RCAs are you using?
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03-30-2006, 06:38 PM
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#14
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Tainted Love
Join Date: Apr 2004
Location: Romania
Posts: 4,647
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Quote: Originally Posted by sama
that's a good idea. if you don't get noise, then keep laying the cable slowly along the path it's currently in, until you get the noise. that will tell you where abouts your noise is coming from. Perhaps then you can sheild that? maybe some lead as it's soft. no idea where u'd get it!
shave a load of pencils
or maybe replace the rca cable wihta custom made one that is made up of 2 twisted pairs. may not offer the same quality as a full on OFC cable, but hey what's better? OFC + whine or non-OFC + no-or-less-whine?
I'll try just that.
The noise is barely hearable to someone that doesn't know it's there, but for me it's really annoying...it shouldn't be there...you know what I mean...
Quote: Originally Posted by Red GTi VR6
what RCAs are you using?
They're the RCAs that came with an amp kit. Not a top brand, but better that a no name one...Phonocar. They look pretty quality.
These are connected to the PC, through an RCA-Jack adapter, like this one.
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03-30-2006, 07:56 PM
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#15
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_
Join Date: Mar 2004
Location: Little Elm, Texas
Posts: 13,481
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hrmmm - sounds sketchy to me...
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