But if those speakers are just plain in parallel like that, does that mean the head unit is different - and a standard aftermarket device wouldn't do - because it's driving into 4 rather than 8 ohms?
On the other hand, if the head unit turns out to be passable, but I want to replace some of the speakers, does this mean that I can/need to leave their arrangemetn as is, i.e. even if I swap both sets of front speakers, wire the new just like the old ones were, rather than with an appropriate crossover?
most gm cars use regular 4 ohm setups. if there is a factory amplifier (ie bose) then the speakers are probably going to be 2 ohm. check for an amplifier first and then test the speaker wires to see what ohm load they are. if they end up being a set of 4 ohm components then they are probably two 8 ohm speakers in parallel with the small capacitor inline with the tweeter.
aftermarket setups are usually 4 ohms so you dont have to worry about over bearing the factory headunit. i would just use the factory locations if replacing the speakers up front using a newer component set that uses close to the same size tweeter as factory. doesnt matter but youd have to fabricate a mount for the bigger/smaller tweeter. a crossover is usually small enough now that you can hide them in the doors so there wouldnt be any worry about using or not usuing one. preferably using a crossover is your best bet for sound and simplicity. this way youd only need the positive and negative speaker wires through the door grommet to the crossover then split of to the designated speakers.
I do recommend, though, getting a new aftermarket headunit. be it one for a multi amp setup or just a simple (i said simple, not ****ty ) one to just play cds and have a better internal amplifier than your stocker.
a complete re-wire is also recommended as well. speaker wire is the same as power wire. if its too small youll get a ****ty quality. a decent size like 12-14 gauge is recomended since the door and rear deck speakers arent lower frequency producers. although on subwoofer, if you add one, i recomend running 8g wire for speaker wire from the amp straight through to the terminals on the subwoofer itself. youll notice the difference!
there might be some usless info in there but hope it helps.
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