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<blockquote data-quote="jrwalte" data-source="post: 4208692" data-attributes="member: 584454">It may be noise getting through your HU and traveling along your RCA to your sub amp.Try disconnecting your RCAs from your sub amp and turn your stereo on (volume off).&nbsp; Turn the sensitivity (gain) of your amp up and start your car.&nbsp; Do you hear a thump or alot of noise?&nbsp; With the gain turned up you should expect some noise...but you shouldn&#039;t hear your car revving. If not, you have a good sub amp ground.&nbsp; The issue is either coming from your HU or your RCA.Turn off power reconnect RCAs and pull out your HU to disconnect the RCAs from it.&nbsp; Turn stereo on.&nbsp; Any thump or noise?&nbsp; If not, it is your HU causing the problem.Possible HU issues can be:Antenna - disconnect to testground - try creating your own ground to the chassisdeffective - something internally in your HU may have screwed up and it needs to be serviced.</blockquote>

[QUOTE="jrwalte, post: 4208692, member: 584454"] It may be noise getting through your HU and traveling along your RCA to your sub amp. Try disconnecting your RCAs from your sub amp and turn your stereo on (volume off). Turn the sensitivity (gain) of your amp up and start your car. Do you hear a thump or alot of noise? With the gain turned up you should expect some noise...but you shouldn't hear your car revving. If not, you have a good sub amp ground. The issue is either coming from your HU or your RCA. Turn off power reconnect RCAs and pull out your HU to disconnect the RCAs from it. Turn stereo on. Any thump or noise? If not, it is your HU causing the problem. Possible HU issues can be: Antenna - disconnect to test ground - try creating your own ground to the chassis deffective - something internally in your HU may have screwed up and it needs to be serviced. [/QUOTE]

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