hum, buzz, etc. noise when car is off?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=101699
Printed Date: May 09, 2024 at 7:41 PM
Topic: hum, buzz, etc. noise when car is off?
Posted By: kickercivic1
Subject: hum, buzz, etc. noise when car is off?
Date Posted: January 29, 2008 at 8:51 PM
I have Pionner cd player, rockford 4 channel amp.... and carcomputer..... I get this loud buzz noise even when the car is off, I tried four different grounding points still the same.. Any idea when this buzz might be coming from. I am not using any time of inverter in the car.
Replies:
Posted By: StealthEs
Date Posted: January 29, 2008 at 9:51 PM
test the amp turn on wire when you shut the car off. Does it lose all power or slowing drops down in voltage.
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Cris
Posted By: DYohn
Date Posted: January 30, 2008 at 8:29 AM
Carputer would be my guess, although the infamous Pioneer line level ground loop problem could also be the culprit. Is it a genuine carputer or a PC or Mac that has been adapted to work in a car? First try disconnecting the power and ground from it and see if the noise goes away. If not, my next guess is you need to get rid of Pioneer head units... ------------- Support the12volt.com
Posted By: kickercivic1
Date Posted: January 30, 2008 at 3:59 PM
Well its a carputer, not just a home pc. i have jetway 1.5GHZ mobo. m2-atx and etc... all of this in a voompc-2 to case. I know its not the cd player.... This noise only occurs when i plug something into LINE-IN of the mobo.
Posted By: kickercivic1
Date Posted: January 30, 2008 at 4:07 PM
StealthEs wrote:
test the amp turn on wire when you shut the car off. Does it lose all power or slowing drops down in voltage.
Just curious what diffrence would this make? sorry i new to this... I will check with the meter tomorrow when i get to work and let you know for sure.
Posted By: DYohn
Date Posted: January 30, 2008 at 4:10 PM
kickercivic1 wrote:
Well its a carputer, not just a home pc. i have jetway 1.5GHZ mobo. m2-atx and etc... all of this in a voompc-2 to case. I know its not the cd player.... This noise only occurs when i plug something into LINE-IN of the mobo.
Then there's your problem. How is the computer powered and grounded? ------------- Support the12volt.com
Posted By: kickercivic1
Date Posted: January 30, 2008 at 5:07 PM
DYohn] wrote:
p>kickercivic1 wrote:
Well its a carputer, not just a home pc. i have jetway 1.5GHZ mobo. m2-atx and etc... all of this in a voompc-2 to case. I know its not the cd player.... This noise only occurs when i plug something into LINE-IN of the mobo.
Then there's your problem. How is the computer powered and grounded?
Computer's power(+) is coming straight from the battery and its grounded by the kicks. i tried grounding it 3 different places. I also ran the power and ground straight to the battery and still that that buzz noise when car is off and then when i turn the engine on i get the whine.. I also tried grounding the cd player, computer, sirius and HD radio audio to one place and still the noise is there.
Posted By: DYohn
Date Posted: January 30, 2008 at 5:16 PM
Sounds like there is a ground plane issue inside the carputer. Try connecting a wire (any size wire) between the outer (ring) connector on one of the RCA outputs and the carputer's case. If that helps the carputer has a poorly designed and possibly defective preamp. ------------- Support the12volt.com
Posted By: kickercivic1
Date Posted: January 30, 2008 at 5:33 PM
DYohn] wrote:
ounds like there is a ground plane issue inside the carputer. Try connecting a wire (any size wire) between the outer (ring) connector on one of the RCA outputs and the carputer's case. If that helps the carputer has a poorly designed and possibly defective preamp.
I just did that right now. when touch the spekaer Output from the carputer to the ground the noise gets quiter, its still there but just not as loud. what you think might be to cause that?
Posted By: DYohn
Date Posted: January 30, 2008 at 6:17 PM
The output from the carputer is a line level, right? Not a speaker output? It has to connect to your head unit or to an amp, right? The carputer has a bad or poorly designed ground plane. Either it is defective or just cheap. Take it back where you bought it if it's still under warranty for repair or replacement - of course if it's just cheap, then you are screwed. ------------- Support the12volt.com
Posted By: StealthEs
Date Posted: January 30, 2008 at 6:47 PM
kickercivic1 wrote:
StealthEs wrote:
test the amp turn on wire when you shut the car off. Does it lose all power or slowing drops down in voltage.
Just curious what diffrence would this make? sorry i new to this... I will check with the meter tomorrow when i get to work and let you know for sure.
I car I troubleshot awhile ago had the same problem. The amp turn on would slowly loose power cause to amp to turn on and off before going off causing back feed into the RCA causing the speakers to pop. ------------- Cris
Posted By: kickercivic1
Date Posted: January 30, 2008 at 6:54 PM
DYohn] wrote:
p>The output from the carputer is a line level, right? Not a speaker output? It has to connect to your head unit or to an amp, right?The carputer has a bad or poorly designed ground plane. Either it is defective or just cheap. Take it back where you bought it if it's still under warranty for repair or replacement - of course if it's just cheap, then you are screwed.
Ya its a speaker output or the headphone whatever you want to call it. ITs a green port. the wire from that port goes to pioneer cdplayer aux in and then to the amps... The problem is just wried, whole system runs just fine till i hook up Line-in into the motherboard for sirius or HD and this noise starts.. This is the motherboard i have https://www.jetway-mini-itx.com/j7f2-j7f2we1g5d.html
Posted By: i am an idiot
Date Posted: January 30, 2008 at 8:38 PM
When playing MP3s off of the hard drive, is the noise there?
Posted By: kickercivic1
Date Posted: January 30, 2008 at 9:10 PM
i am an idiot wrote:
When playing MP3s off of the hard drive, is the noise there?
This noise had notting to do with Harddrive... This noise start when the computer is booting and the sound card is activated in windows.
Posted By: i am an idiot
Date Posted: January 30, 2008 at 9:25 PM
You at one time said that the noise came in when you connected HD or Sirius to the input of the sound card. I was tring to find out if that was the only time you had the noise? Do you have the noise anytime you are listening to the carputer, or just when listening to the sirius or HD via the input jack.
Posted By: mobile1
Date Posted: January 30, 2008 at 11:04 PM
kickercivic1 wrote:
DYohn] wrote:
The output from the carputer is a line level, right? Not a speaker output? It has to connect to your head unit or to an amp, right?
The carputer has a bad or poorly designed ground plane. Either it is defective or just cheap. Take it back where you bought it if it's still under warranty for repair or replacement - of course if it's just cheap, then you are screwed.
Ya its a speaker output or the headphone whatever you want to call it. ITs a green port. the wire from that port goes to pioneer cdplayer aux in and then to the amps... The problem is just wried, whole system runs just fine till i hook up Line-in into the motherboard for sirius or HD and this noise starts.. This is the motherboard i have
https://www.jetway-mini-itx.com/j7f2-j7f2we1g5d.html
The output from you headphone jack is a line level output. Meaning is a low signal that is then sent to the 4ch. amp in the car to be boosted up. Like DYohn said, The problem is a bad ground circuit in your carputer itself.
Posted By: kickercivic1
Date Posted: January 31, 2008 at 9:35 AM
i am an idiot wrote:
You at one time said that the noise came in when you connected HD or Sirius to the input of the sound card. I was tring to find out if that was the only time you had the noise? Do you have the noise anytime you are listening to the carputer, or just when listening to the sirius or HD via the input jack.
Sorry to confuse you. I mean HD for HD radio. Not harddrive.
Posted By: i am an idiot
Date Posted: January 31, 2008 at 12:02 PM
You are not confusing me. I understand that you have a High Definition tuner along with a Sirius Satelite radio tuner. I am sure you probably have some MP3 files on the hard drive of the carputer. I am trying to help you figure out your noise issue. But to do that I need to know if you have noise anytime you are listening to the carputer, or if it only happens when you are listening to one of the external tuners. (HD or Sirius) So if you have an MP3 or even a .wav file on the puter could you play that file and let us know if the noise is present.
Posted By: haemphyst
Date Posted: January 31, 2008 at 12:41 PM
It's the soundcard... Integrated soundcards are NOTORIOUSLY noisy. I just built an HTPC for my living room, and I spent 248.00 on the mobo alone. I bought a 200.00 dollar HTPC case from Antec - SPECIALLY designed and built to be VERY RFI shielded - I still get some 60Hz noise... Not much, but still.
My suggestion to you? Cut your losses right now, disable the integrated soundcard in the BIOS (if possible, and just to free the resources - recommended, but NOT mandatory...), go to your local Circuit City or order online for 50 dollars, a decent external soundcard. It'll be FAR quieter once you get it working, and as an additional benefit, you can run the USB cable (digital, and immune to noise) the better part of the trip, (from the carputer to the head unit) and use REALLY SHORT analog cables to the aux input of your deck.
You MIGHT still have noise, because you ARE using a Pioneer deck, but this is certainly a step in the right direction! Even if you DO get all the noise out, you will still have a garbage S/N ratio, and crappy frequency response using the integrated soundcard... That's just a fact of life! ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: kickercivic1
Date Posted: January 31, 2008 at 1:12 PM
I will order sound card tonight and go from there. Thank you for help so far.
Posted By: kickercivic1
Date Posted: February 05, 2008 at 8:33 PM
I just got intel mobo in and installed it. STILL THAT NOISEEEEE... I have no clue where to troubleshoot now.
Posted By: i am an idiot
Date Posted: February 05, 2008 at 9:16 PM
Have to say I saw that coming.
Posted By: kickercivic1
Date Posted: February 05, 2008 at 9:23 PM
i am an idiot wrote:
Have to say I saw that coming.
To make your answer more clear. my sound system is prefect even with the carputer. The problem is soon as i plug in HD radio or sirius tuner into the line in jack of the motherboard, i start getting this constant loud buzz noise even with car off. I get it no matter if the mp3 is playing or not.
Posted By: i am an idiot
Date Posted: February 05, 2008 at 10:07 PM
Have you tried grounding the shield of the RCA jacks that are connected to the HD or the Sirius tuner? Also have you tried doing the same thing at the Input of the radio?
Posted By: kickercivic1
Date Posted: February 06, 2008 at 5:39 AM
i am an idiot wrote:
Have you tried grounding the shield of the RCA jacks that are connected to the HD or the Sirius tuner? Also have you tried doing the same thing at the Input of the radio?
Yes i have done this on my old mobo and not to much of a difference.. Can power or ignition cause this huzz or buzz??
Posted By: i am an idiot
Date Posted: February 06, 2008 at 6:38 AM
Sounds as though you have a ground loop issue. You should be able to go to your local audio shop and get them to let you try one to see if it will fix your problem. A ground loop isolator that is. Pac-audio.com has an SNI-1 Try connecting it on the output of one of the tuners. If it does not work there you can try it on the input jack of the deck.
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