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getting noise from subs


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187smurf187 
Member - Posts: 27
Member spacespace
Joined: February 18, 2006
Location: United States
Posted: June 25, 2006 at 8:34 AM / IP Logged  

I installed some subs.Im having a problem because when the car  is on the subs make alot of noise it kind of sounds like a bad exhaust in the car.sometimes it stops but most of the time that the car is on its noisy.but when the car isnt on it sounds clear no nosies no nothin.i was thinking it might be that the bayyery was too close to the amp beacuse i remeber i read something like that because my battery is in the trunk.

Thanks in advance for any info.

B@zZ SmurF B@zZ
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: June 25, 2006 at 8:49 AM / IP Logged  
This is caused by one or a combination of several things.  usually it is a sign the amplifier is overloaded, either because the gain is way too high or the impedance load is way too low or both.  It could also be bad RCA cables or a bad graound.  Or both, or all four.  Or it could simply be the amp is fried. 
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187smurf187 
Member - Posts: 27
Member spacespace
Joined: February 18, 2006
Location: United States
Posted: June 25, 2006 at 10:26 AM / IP Logged  
But if the amp is fried wouldnt it stop workin?.........so how could i fix the the gain or the impedance load problem?
B@zZ SmurF B@zZ
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: June 25, 2006 at 10:26 AM / IP Logged  
I'm steering towards that the ground is bad or the gains are set too high
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Velocity Motors 
Moderator - Posts: 12,488
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 Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: June 25, 2006 at 10:30 AM / IP Logged  
Look on the side or top of the amp for the word GAIN  and turn the dial/knob counter clockwise all the way. Now play something on the system and slowly turn it clockwise and listen for the noise. If it's still there check the ground and ensure that it's free of paint, dirt and debrise or oil.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
187smurf187 
Member - Posts: 27
Member spacespace
Joined: February 18, 2006
Location: United States
Posted: June 25, 2006 at 10:46 AM / IP Logged  
ok ill try that.....is it ok if i ground the amp to the - battery teminal i think it would be the same wouldnt it since my battery is in the back its about 2 to 3 feet from the amp
B@zZ SmurF B@zZ

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