Ok im used to just having aftermarket HU's and using rca's..but now i have a 2004 chevy cavalier, and i need to keep the radio stock..i have a amp and subs, but i need to know what kind of L.O.C to use (high to low, etc.), maybe a site that has it so i can see what it is, and i also need to know how to use it..i know its something with the back speakers but im not sure..any help greatyle appreciated...
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JVC HU
Rockford 501bd (500 watt rms)
Rockford Hx2 Rf2212 (1)
Kenwood 6969 (4)
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Here are some sources: https://www.peripheral-aamp.com/peri_faq_main.htm https://www.davidnavone.com/
If you are only adding an amp for subs, you can use a two-channel converter. It picks up the signal from the OEM speaker wires and converts to RCA's for amp input. Easiest is to tap rear speaker wires because of their location, but you may want to tap the front ones instead so that when you fade the deck to attenuate the rear speakers the sub input won't fade out with them. Buy a high quality adjustable LOC and you will be able to adjust it for highest signal-to-noise ratio and lessen the chance of adversely affecting the quality of the sub input. The P35 is a good one for you.