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Originally Posted by FR-S2GT86
Answer 1) Yes, just make sure that your speaker wires' positive and negative leads are connected properly so that your subwoofer signals are in phase when you connect them up to your aftermarket amp to avoid signal cancellation.
Answer 2) On the input to the amp, you'll have a full spectrum audio signal. The output however, has never to my knowledge been tested for where the built-in low-pass crossover is set at, nor is it's slope value known.
Answer 3) Just ground your subwoofer amp to a bolt somewhere near the amp location. I used the bolt that holds down the OEM amplifier since it's no longer used in my setup.
Answer 4) Since I went all aftermarket, I'm using all active crossovers either built into my head units or built into the amplifiers. You may want to add some passive crossovers to the door speakers as a high-pass filter. In effect, you'll have a band-pass setup in your doors like I do, but in your case you'll have very little adjustment potential. You won't be able to adjust the low-pass setting at all built into the OEM amplifier, and you have to physically replace the passive high-pass crossovers every time you feel the need to make an adjustment. Just remember to design your passive crossovers for 2-ohm drivers.
Just letting you know what you're getting yourself into by trying to integrate existing factory equipment. It may be easier for you to install another amplifier to power the door speakers that has a band-pass crossover built into it. That way you'll have a much easier time making adjustments. Keep us informed of what you end up doing.
I think back now that I could have probably gotten away with removing the passive crossovers from my stock speakers and ran them all off of the active setup that I have now instead of replacing them all with aftermarket drivers. Hmmmm.......
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Thanks for the advice. Your suggestion of ditching the factory door amp in favor of a better one with crossover feature makes sense, I'm thinking more of going that route.