noise from pioneer avic at low vol?

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=128181
Printed Date: June 10, 2024 at 1:21 PM

Topic: noise from pioneer avic at low vol?

Posted By: tresvatos
Subject: noise from pioneer avic at low vol?
Date Posted: August 08, 2011 at 9:06 PM

I have a Pioneer Avic unit flip up screen AVH-P4900DVD directed to a Sony 75x4 amplifer wired in conjunction to a 1 farad cap. which powers my mids and highs.. A Fosgate Punch 200 is also wired to the same farad cap. RCA wires are run far apart from the Power Wire as well. I also wired a small computer 4"x4" 12v. Fan behind the Pioneer Avic in the dash very close to the stereo... I am getting a humming at low volume and can't get rid of it, so wondering if may be the d
Fans electric motor.. The setup is on a Dodge truck, and it has the big 4 installed already with 2 ga. cable, so kind of curious if a fan may cause this low volume hum. What are your thoughts please. Thanks

Replies:

Posted By: i am an idiot
Date Posted: August 09, 2011 at 12:08 AM

Read through a few of these.
https://www.the12volt.com/installbay/search.asp?KW=bcae1.com&Submit.x=0&Submit.y=0&SM=1&SI=PTBA&FM=0&aid=199561&OB=1

Posted By: tresvatos
Date Posted: August 09, 2011 at 6:09 AM

Sorry, but I could not open anything at that link... I know this subject has been covered numerous times, but my question is more geared towards if the fan motor may be interfering with the radios electronics and making the humming noise...

Posted By: i am an idiot
Date Posted: August 09, 2011 at 5:52 PM

https://bcae1.com/images/rca/temporaryrcashieldrepair.html

Perform the test at the top of the above page. If there is no continuity from the shield of the RCA cable to the chassis of the radio, then the repair to the bottom of that page will fix your problem. The fan should not cause any noise in a properly shielded system. The blown fuse inside the radio makes it NOT a properly grounded system.

Posted By: tresvatos
Date Posted: August 10, 2011 at 10:00 AM

Thanks ! I believe I will give this a try!

Posted By: tresvatos
Date Posted: August 14, 2011 at 1:50 PM

Sir this solved my problem.. Stereo sounds much better. Thank you very much for the link

Posted By: i am an idiot
Date Posted: August 21, 2011 at 4:22 PM

Just so you will know in the future, the cause of the fuse blowing was while connecting an amp to your system. You probably connected the power wire and the RCA jacks to your amp before you connected the ground connection. Or while removing an amp, you disconnected the ground connection first. Either of these 2 is just about guaranteed to give you problems with any pioneer deck.

Notice in the instruction manual for just about any amp or radio, the first line reads disconnect the vehicle battery.