2002 pontiac trans am

if the factory monsoon speaker at the B-pillar is a DVC with two 4ohm coils each with their own channel off the monsoon amp, what would happen if i used a higher quality aftermarket speaker with one 4 ohm voicecoil, and used both channels' positives to the speaker's positive and both channels' negatives to the speaker's negative. if i can only use one channel off the amp, i will, but i'd rather be able to use both because i figured the two channels wouldn't exceed the power rating of the speakers. if i wired it in this fashion, wouldn't each channel still see a 4 ohm load? so in essence it would provide the same power to the single voicecoil as it did to the compined power of the dual voicecoils on the factory, right? i'm trying to wrap my head around the physics of it, but i am just not sure if it makes sense to wore the single voicecoil speaker this way.

I know of only 1 automotive amplifier that is capable of doing what you are asking to do.  I really can't think of a way to explain why you can't do it.