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<blockquote data-quote="keep_hope_alive" data-source="post: 7400220" data-attributes="member: 576029"><p>i think you are right to be suspect of the factory radio.</p><p></p><p>if it was front only then i'd expect some EMF with the crossover's inductors and would suggest moving them.</p><p></p><p>my advice is usually to replace the head unit before the speakers, since the factory head unit will be insufficient to power aftermarket speakers.</p><p></p><p>i assume you simply extended the factory wire at each speaker? how did you make those connections? solder/heat shrink? did you use female disconnect terminals (the ones that came with the speakers)? the methods that NEC finds acceptable for AC wiring in homes is not acceptable in the automotive environment. i.e. no wire nuts and electrical tape as an insulator over crimp or soldered terminals/connectors. maybe you knew that, but it's worth mentioning. one common mistake i have seen made over the years is to wrap bare wire around the speaker terminals. that has a tendency to short out against the speaker basket - which is grounded to the car door. one strand touching any metal can wreck havoc on a system.</p><p></p><p>the best way to install car audio is to take a que from the factory wiring methods. all in loom, all secured often, all terminated in plugs - i.e. no splices.</p><p></p><p>here is a good build log that details wiring methods for car audio - pictures say a lot more than words:</p><p></p><p><a href="http:////forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html" target="_blank">http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html</a></p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7400220, member: 576029"] i think you are right to be suspect of the factory radio. if it was front only then i'd expect some EMF with the crossover's inductors and would suggest moving them. my advice is usually to replace the head unit before the speakers, since the factory head unit will be insufficient to power aftermarket speakers. i assume you simply extended the factory wire at each speaker? how did you make those connections? solder/heat shrink? did you use female disconnect terminals (the ones that came with the speakers)? the methods that NEC finds acceptable for AC wiring in homes is not acceptable in the automotive environment. i.e. no wire nuts and electrical tape as an insulator over crimp or soldered terminals/connectors. maybe you knew that, but it's worth mentioning. one common mistake i have seen made over the years is to wrap bare wire around the speaker terminals. that has a tendency to short out against the speaker basket - which is grounded to the car door. one strand touching any metal can wreck havoc on a system. the best way to install car audio is to take a que from the factory wiring methods. all in loom, all secured often, all terminated in plugs - i.e. no splices. here is a good build log that details wiring methods for car audio - pictures say a lot more than words: [URL="http:////forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html"]http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html[/URL] [/QUOTE]
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