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Engine noise problem


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pimpjuice 
Member - Posts: 5
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Joined: February 27, 2005
Location: United States
Posted: March 01, 2005 at 10:17 AM / IP Logged  
It is an Alpine CVA 1004, i am using the same long cable to hook up to the DVD player though, and when i hook the DVD player directly to the HU, there is no sound, using the same long cables. I could send out the HU but then if that's not the problem, i will be out some money, however much alpine charges because it is no longer under warranty. Maybe it is just a lost cause. Could it be anything else?
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: March 01, 2005 at 2:55 PM / IP Logged  
So if the cables are open, you get noise.  If the cables are plugged into the tuner, you get noise, but if the cables are plugged into the DVD, no noise?  And it's the same cables?  Try grounding the outer ring.
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pimpjuice 
Member - Posts: 5
Member spacespace
Joined: February 27, 2005
Location: United States
Posted: March 01, 2005 at 3:29 PM / IP Logged  
Yes that's the situation. What is the outer ring?
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: March 01, 2005 at 4:00 PM / IP Logged  

The outer ring or shield conductor of the RCA cables.  It sounds to me like your HU has a bad ground plane on the pre-amp output creating a ground loop in the pre-amp signal.  When you plug in the DVD player it grounds the RCA's well enough to overcome this, but the tuner does not. 

Try an experiment: disconnect the RCAs.  Play the system so you hear the noise.  Connect a wire from the outer ring of the RCA plugs to ground.  You can use the ground terminal on one of your amps.  See if the noise stops.  If so, then my guess is right.  If not, then there is something else going beyond my ability to troubleshoot over the internet!

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