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<blockquote data-quote="DNick454" data-source="post: 6493434" data-attributes="member: 600755">Ehhh, be advised, there might be crossovers you don&#039;t know about. You need to get a CLEAN unmolested signal so that you will actually receive the full spectrum of notes.Just to give you a quick example. I installed a system for my friend over the summer and it was an Infiniti QX4 with the factory Bose stereo (a complete pain in the *** to work with). Anyways, long story short, my friend wants bass on a budget so he decides to keep the factory headunit. So after reading several webpages and digging through several wire locations, I finally find the 4-channel amplifier that comes stock and I tap into the outputs and stick a Line-Out Converter in there. After dialing it all in we proceeded to start beatin&#039; the block down //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif We did however notice that it was really lacking in the lows though, even for a tuning of 34Hz. Turns out, the factory 4 channel amplifer has a crossover to take away some of the crazy lows off of the door speakers. Good for the door speakers, not good for using as a signal to drive subs //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gifLong story short, I ended up figuring out which wires were the low-level inputs BEFORE any alteration and since they were low-level, I just threw the LOC&#039;s in the garbage and just spliced RCA ends right in there and put them to the sub-stage amp.Sorry for the ridiculously long story, just a fair warning, when you&#039;re dealing with &quot;upgraded&quot; factory systems, sometimes things aren&#039;t as simple as they seem and it&#039;s a huge ****ing headache.</blockquote>

[QUOTE="DNick454, post: 6493434, member: 600755"] Ehhh, be advised, there might be crossovers you don't know about. You need to get a CLEAN unmolested signal so that you will actually receive the full spectrum of notes. Just to give you a quick example. I installed a system for my friend over the summer and it was an Infiniti QX4 with the factory Bose stereo (a complete pain in the *** to work with). Anyways, long story short, my friend wants bass on a budget so he decides to keep the factory headunit. So after reading several webpages and digging through several wire locations, I finally find the 4-channel amplifier that comes stock and I tap into the outputs and stick a Line-Out Converter in there. After dialing it all in we proceeded to start beatin' the block down [IMG]//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif[/IMG] We did however notice that it was really lacking in the lows though, even for a tuning of 34Hz. Turns out, the factory 4 channel amplifer has a crossover to take away some of the crazy lows off of the door speakers. Good for the door speakers, not good for using as a signal to drive subs [IMG]//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif[/IMG] Long story short, I ended up figuring out which wires were the low-level inputs BEFORE any alteration and since they were low-level, I just threw the LOC's in the garbage and just spliced RCA ends right in there and put them to the sub-stage amp. Sorry for the ridiculously long story, just a fair warning, when you're dealing with "upgraded" factory systems, sometimes things aren't as simple as they seem and it's a huge ****ing headache. [/QUOTE]

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