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The factory system is 2 ohm. Most likely the Polks are 4 ohm - which means they are being driven by roughly 7 watts RMS per channel.
There is no crossover, it's just a cap across the tweeter.
If you're going to do it, do it right and buy a complete set of component speakers that comes with crossovers (Yes, Polk does make component speakers - I can't vouch since I don't use them). Don't try to piecemeal it together with what you have. You didn't mention a model number, but assuming what you have is a decent 2 way, move them to the rear and buy a new component set for the front doors.
Ideally you'd run new speaker wire since the stock wiring is barely adequate (would also keep you from having to do the actual amp bypass).
It would also be very beneficial to install a decent amp for them, rather than running them off the head unit.
There is no crossover, it's just a cap across the tweeter.
If you're going to do it, do it right and buy a complete set of component speakers that comes with crossovers (Yes, Polk does make component speakers - I can't vouch since I don't use them). Don't try to piecemeal it together with what you have. You didn't mention a model number, but assuming what you have is a decent 2 way, move them to the rear and buy a new component set for the front doors.
Ideally you'd run new speaker wire since the stock wiring is barely adequate (would also keep you from having to do the actual amp bypass).
It would also be very beneficial to install a decent amp for them, rather than running them off the head unit.