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Message: <blockquote data-quote="rowanHELP" data-source="post: 8781653" data-attributes="member: 685112"><p>Hi all, I have just ‘attempted’ to install an amp and a subwoofer. I already have an aftermarket head unit and front speakers and wanted to pump up my setup. I got my speakers and head unit professionally installed, but didn’t have the option to do that this time and decided to go for it. I did everything and the amp turned on but would not pass an output signal into my sub. I tested the output and it was not giving signal (with a multimeter) and it was doing a wierd negative amps when testing. I tested my ground and it was all good, my power coming in was good. I am lost on what to do, if someone could give advice it would be huge. I am using an POWERBOX400.1M-V7 amp and a 10inch JL sub. I would appreciate any and all help i can receive!</p></blockquote><p></p>

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