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<blockquote data-quote="ASDF12345" data-source="post: 192190" data-attributes="member: 545961">the initial turn on &quot;pop&quot; goes down when the gains go down but when we set the volume at number 1 then go back and forth between zero and one it pops between them.engine noise, this one is weird. theres a sub amp and a high/mid amp. when the sub amp is completely disconected there is no engine noise from anywhere. but when we plug it back in, the highs/mids cut out at around volume 23/35. and they have engine noise. so really, engine noise is only a problem when the sub amp is hooked up.this led us to belive it was the sub amp itself but it had worked fine for months, theproblem only started when a new headunit was installed. anyway, we did all the common amp checks, new grounds (they are ****ing rock solid now) then i hooked up a discman to the rca&#039;s on the amps and their was no noise. this proves its not the amp. so its got be be signal.we pulled the headunit and rewired the whole thing. still had noise. then we tried all the different sources cd/mp3/am/fm. they all had engine noise.what doesnt make sense to me is that it has engine noise even when the engine is off. all the connections are solid, and all the RCA&#039;s are good. i know this because we ran different sets of RCA&#039;s right off the back of the headunit to the amps.my best intution leads me to believe its has something to do with the headunits output system that is only in effect when the subwoofers are connected.what do you guys thing?im usually pretty good at trouble shooting systems and ive tried many other things that i didnt list. so let me knows what it is</blockquote>

[QUOTE="ASDF12345, post: 192190, member: 545961"] the initial turn on "pop" goes down when the gains go down but when we set the volume at number 1 then go back and forth between zero and one it pops between them. engine noise, this one is weird. theres a sub amp and a high/mid amp. when the sub amp is completely disconected there is no engine noise from anywhere. but when we plug it back in, the highs/mids cut out at around volume 23/35. and they have engine noise. so really, engine noise is only a problem when the sub amp is hooked up. this led us to belive it was the sub amp itself but it had worked fine for months, theproblem only started when a new headunit was installed. anyway, we did all the common amp checks, new grounds (they are ****ing rock solid now) then i hooked up a discman to the rca's on the amps and their was no noise. this proves its not the amp. so its got be be signal. we pulled the headunit and rewired the whole thing. still had noise. then we tried all the different sources cd/mp3/am/fm. they all had engine noise. what doesnt make sense to me is that it has engine noise even when the engine is off. all the connections are solid, and all the RCA's are good. i know this because we ran different sets of RCA's right off the back of the headunit to the amps. my best intution leads me to believe its has something to do with the headunits output system that is only in effect when the subwoofers are connected. what do you guys thing? im usually pretty good at trouble shooting systems and ive tried many other things that i didnt list. so let me knows what it is [/QUOTE]

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