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obnoxious buzz coming from speakers


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AJRXtreme 
Silver - Posts: 302
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Joined: June 08, 2004
Location: United States
Posted: August 06, 2006 at 8:31 PM / IP Logged  
Alrite I just hooked up my 4 channel amp today for my mids and highs. I ran every wire perfect and my amp turns on fine with the green light. But when the amp turns on I get a buzzing noise. My ground for the amp is connected straight to the chasis with the paint scratched. The ground wire is only 3 inches long. When I would move the wire around I would get a different pitch of buzzing. What can I do to eliminate this noise? any help would be greatly appreciated. thankyou
03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004
wiseman 
Member - Posts: 19
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Joined: July 02, 2006
Location: United States
Posted: August 06, 2006 at 8:52 PM / IP Logged  
Most cases i that i would run across this problem is because the rca cables is too close to a ground or power cable.
Ram Customs
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: August 06, 2006 at 8:54 PM / IP Logged  
so the paint is only scratched??? how about you get some sand paper and get that down to bare metal first
AJRXtreme 
Silver - Posts: 302
Silver spacespace
Joined: June 08, 2004
Location: United States
Posted: August 08, 2006 at 11:00 PM / IP Logged  
Okay I sanded down the area for a perfectly silver smooth surface and I even drilled a hole in the floor and bolted down the ring terminal for the ground wire. I still have the same buzzing sound and I cant understand whats going on. Can someone please help me
03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: August 08, 2006 at 11:28 PM / IP Logged  
Pioneer head unit?  Could be a bad RCA ground in the HU since they are known for this defect.  Try grounding the outer ring of the RCA cable.  You might also want to try different RCA cables.  It is also possible your ground return resistance is too high.  Measure it from the amp's ground connection to the battery negative terminal.  Should be less than one ohm.  If it's higher, you either need a better ground point or you need to upgrade the battery ground and probably the big three.   I also recommend running a new dedicated ground for the HU and not using the vehicle's wiring harness ground.
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AJRXtreme 
Silver - Posts: 302
Silver spacespace
Joined: June 08, 2004
Location: United States
Posted: August 10, 2006 at 11:08 AM / IP Logged  

Problem solved! Thankyou Dyohn for your help, I found out it was the rca ground.

03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004

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