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<blockquote data-quote="keep_hope_alive" data-source="post: 8059555" data-attributes="member: 576029">pics?RCA routing won&#039;t cause noise.likely, you have a few things going.first, why do you have a 4 channel amp driving subs?&nbsp; a monoblock amp should have been used.how are the speakers wired to the amp?&nbsp; i assume one coil to each channel or coils in series to amp channels bridged.&nbsp; regardless, that is the wrong tool for the job.second, i assume they used a line output converter (LOC) that connects between the rear deck speakers and the amp RCA inputs.&nbsp; the make/model of the LOC is important.&nbsp; if there is no LOC, then that is one problem because the amp doesn&#039;t have high level inputs (though it can accept an 11V input).&nbsp; the noise is caused from a signal ground issue.&nbsp; a proper LOC will prevent this.the amp controls should be set to 2 channel input (most likely).&nbsp; for now, pull the fuse at the battery to shut the amp off until we sort this out.&nbsp; if it doesn&#039;t sound right, then damage is possible.next, take detailed pictures of everything they did.&nbsp; connections at the factory speaker wires, at the amp, and take a pic of where all of the controls are set (or tell us).I recommend this basic LOC<a href="http://davidnavone.com/zencart/index.php?main_page=product_info&amp;amp;cPath=1&amp;amp;products_id=1&amp;amp;zenid=hhsqss4affdcpit60tl672v812" target="_blank">N-RHL2 - BEST LOC IN THE WORLD!! - $24.95 : Zen Cart!, The Art of E-commerce</a>or you can get a nicer piece that also does bass correction - Audio Control is a good source and their LC2i is a nice piece<a href="http://www.audiocontrol.com/17612/645207/OEM-Integration/LC2i-2ch-Line-Out-Converter-with-AccuBASStm-and-Subwoofer-Control.html" target="_blank">LC2i 2ch Line Out Converter with AccuBASS and Subwoofer Control</a>either of these will give you the proper interface between car and amp.lastly, they likely screwed the amp to the back seat metal.&nbsp; attaching an amp directly to car metal can induce a ground loop.&nbsp; i always mount amps to wood then secure wood to metal.&nbsp; carpet the wood to make it look good.</blockquote>

[QUOTE="keep_hope_alive, post: 8059555, member: 576029"] pics? RCA routing won't cause noise. likely, you have a few things going. first, why do you have a 4 channel amp driving subs? a monoblock amp should have been used. how are the speakers wired to the amp? i assume one coil to each channel or coils in series to amp channels bridged. regardless, that is the wrong tool for the job. second, i assume they used a line output converter (LOC) that connects between the rear deck speakers and the amp RCA inputs. the make/model of the LOC is important. if there is no LOC, then that is one problem because the amp doesn't have high level inputs (though it can accept an 11V input). the noise is caused from a signal ground issue. a proper LOC will prevent this. the amp controls should be set to 2 channel input (most likely). for now, pull the fuse at the battery to shut the amp off until we sort this out. if it doesn't sound right, then damage is possible. next, take detailed pictures of everything they did. connections at the factory speaker wires, at the amp, and take a pic of where all of the controls are set (or tell us). I recommend this basic LOC [URL="http://davidnavone.com/zencart/index.php?main_page=product_info&cPath=1&products_id=1&zenid=hhsqss4affdcpit60tl672v812"]N-RHL2 - BEST LOC IN THE WORLD!! - $24.95 : Zen Cart!, The Art of E-commerce[/URL] or you can get a nicer piece that also does bass correction - Audio Control is a good source and their LC2i is a nice piece [URL="http://www.audiocontrol.com/17612/645207/OEM-Integration/LC2i-2ch-Line-Out-Converter-with-AccuBASStm-and-Subwoofer-Control.html"]LC2i 2ch Line Out Converter with AccuBASS and Subwoofer Control[/URL] either of these will give you the proper interface between car and amp. lastly, they likely screwed the amp to the back seat metal. attaching an amp directly to car metal can induce a ground loop. i always mount amps to wood then secure wood to metal. carpet the wood to make it look good. [/QUOTE]

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