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08-29-2007, 07:48 PM | #1 |
Scooby Newbie
Member#: 6785
Join Date: May 2001
Location: Toronto
Vehicle:2002 WRX Blue |
Possible victim to Pioneer preout problem? Am I?
Hi all.. I have done over 8 hours of troubleshooting before I decided to make this posting.... here is the setup:
Pioneer P9800 head unit Simple 2 channel amps driving 2 speakers directly I am getting "noise" whenever RPM goes up... or whenever the AC turn on! Troubleshooting have been done so far: * Head Unit have been grounded, re-grounded, re-re-grounded in multiple place * Amp have been grounded and re-grounded too many times * Power to amp is direct from battery, also tried using a cap in between * power cable and signal cable run separately Additional elimination have been done as well: * head unit is connect to amp via a "spare" RCA cable running OUTSIDE the car (I can guarratee the RCA cable do not cross any power wire) * spare speakers are directly hookup to the amp nearby (again speaker wires are running OUTSIDE the car so I know that's not causing problem) * If I power the speakers directly via the HU - no noise * I have tried 2 different amps (thinking it could be an amp problem) * If I un-hook the pre-out from the amp - no noise Based on the above - (especially the last point - un-hook preout and no noise) - do you think I am a victim to the famous Pioneer preout problem? Unfortunely I purchased my HU via the internet and I live in Canada... so I have no warranty.. Any trick? thanks, Wilson
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08-29-2007, 08:07 PM | #2 |
Scooby Guru
Member#: 78952
Join Date: Jan 2005
Chapter/Region:
MAIC
Location: BSG junkie
Vehicle:2005 WRX CGM |
solder or wrap bare wire around the RCA outs and either solder it or screw it down the the HU chassis. That will ground out the RCA's
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08-29-2007, 11:20 PM | #3 |
Scooby Newbie
Member#: 31399
Join Date: Jan 2003
Location: Chicago
Vehicle:2007 WRX 2015 SQ5 |
This may or not be the problem but in my wifes car I had an alpine HU and and old V12 amplifier. When I upgraded to another set of speakers I decided to get another amp. I tried a JL slash and a series and Xtant and all three of them gave me a slight noise through the speakers when the car was running. I tried everything possible including running a ground from the amp to the battery and grounding the HU to the battery. I also unmounted the amp so that the amp chasis would not ground to the car's chasis. I still had the noise. I put the alpine V12 that is 14 yrs old back in and the sound was gone. Now I do not believe for one second that a Alpine HU must be used with a alpine amp. The only thing I could come up with was the output impedance on the preouts and the inputs on the amp.
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08-30-2007, 12:17 AM | #4 |
Scooby Newbie
Member#: 6785
Join Date: May 2001
Location: Toronto
Vehicle:2002 WRX Blue |
Thx Daishi00, grounding the actual RCA cable (grounding the outside metal) to the HU fixed my front channel 100***37;!
For some reason - when I ground the rear channel - it got rid of 90% of the noise.. but somehow it was still left with a hisssing sound.. thx |
08-30-2007, 07:27 AM | #5 |
Scooby Guru
Member#: 78952
Join Date: Jan 2005
Chapter/Region:
MAIC
Location: BSG junkie
Vehicle:2005 WRX CGM |
Hissing is more of a background noise issue. If it has a constant volume at any volume itself then I would suspect it's either recorded into whatever you're listening to, or you have your gains too high on your amp.
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08-30-2007, 08:06 AM | #6 | |
Scooby Specialist
Member#: 150922
Join Date: Jun 2007
Chapter/Region:
NESIC
Location: Fremont, NH
Vehicle:97 OBS EZ30R 94SVX LSi Bourduex Pearl |
Quote:
-Gaddis |
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08-30-2007, 08:13 AM | #7 |
Scooby Guru
Member#: 78952
Join Date: Jan 2005
Chapter/Region:
MAIC
Location: BSG junkie
Vehicle:2005 WRX CGM |
Pioneers have been having this problem for years. It seems they haven't corrected the issues yet, which is a shame.
Wire quality is overrated IMO. As long as it's not soldered poorly a Radioshack wire will sound like a $5k wire Hell, I just read a really interesting thing LastResort posted up a few days ago that OFC isn't even needed anymore. Swapping your leads for your speakers will change the phase, and therefore could cause the sound to go away depending on where it is in the frequency band, or decrease in sound, but it will also affect the rest of your sound and not always for the best. |
08-30-2007, 09:26 AM | #8 |
Scooby Specialist
Member#: 42540
Join Date: Aug 2003
Location: Santiago, Chile
Vehicle:2007 Forester XT Metallic Grey |
Long time, no see gentlemen.
This may help some of you: http://www.icixsound.com/vb/showthread.php?t=40067 Cheers, MO |
08-30-2007, 04:08 PM | #9 |
Scooby Guru
Member#: 78952
Join Date: Jan 2005
Chapter/Region:
MAIC
Location: BSG junkie
Vehicle:2005 WRX CGM |
Yeah, where you been hiding??????
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08-30-2007, 05:42 PM | #10 |
Scooby Specialist
Member#: 42540
Join Date: Aug 2003
Location: Santiago, Chile
Vehicle:2007 Forester XT Metallic Grey |
Some times, you have to work... to actually work.....
I was lucky enough to be part of the negotiation process for the deal that has been closed between Citigroup and Quiñenco - the holding company for Banco de Chile. And the last few months I've been almost completely absorbed by this. We are in the middle of the merging process now. I'm lurking around here and sf.org from time to time... just not enough time to actively participate; at least not as I would want to. What I did do though, was replacing the rear swaybar of my Forester. What a change!! Thanks for asking.... Cheers, MO |
08-30-2007, 05:56 PM | #11 |
Scooby Guru
Member#: 78952
Join Date: Jan 2005
Chapter/Region:
MAIC
Location: BSG junkie
Vehicle:2005 WRX CGM |
Sounds like you've been really busy my man. Glad to have you back in the fold.
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08-31-2007, 10:26 AM | #12 | |
Scooby Guru
Member#: 1026
Join Date: Mar 2000
Chapter/Region:
MWSOC
Location: Hickigan
Vehicle:'00 RS/WRX Stg5 '98 RS Stock |
Quote:
This can be easily tested with a test disc that has a 0db test track... it's a really interesting test for noise floor... Sometimes it can really show you how much noise is REALLY in the system... |
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