If my car deck has two sets of preamp outputs, do I need an amp for a subwoofer?

Either option will basically be the same most likely... you didn't list the AB amp model # but most amps simply split the signal same as a "y" would do... some amps do crossover the signal if you like... but you almost certainly wouldnt have an audible difference between the Y or amp without x-over I would use the amp out to simplify wiring.

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