to start: i have a 99tl, aftermarket pioneer HU, with all stock speakers and the stock sub hooked in.

so my question: could i not just splice into the 2 rear speaker wires (probably right behind the HU) and run somewires to the trunk and set up 2 more speakers? i was looking at putting in new speakers in the doors but there are some size issues, so i figure i have 2 spots behind my rear seats (either side of the stock sub) that i could very easily fit speakers into.

possible problems/things to think about:
when i splice into the rear stock speaker's wires i know it will split the power between the old speaker and the new speaker, but is there an equation or something to figure out how much power will be lost? (im going to put a 2 ch amp for the 2 new speakers so im not worried about them not having power, just the old 2.)

the new speakers are going to be much more powerful than my stock speakers so my soundstage will be the opposite of what you would normally have so do you think that would sound terrible?

because the new speakers will be run through an amp will they have a delay and cause an echo?

thats all i can think of at the moment, im still just sort of playing around with the idea. lemme know if anyone else has done similar things to this or if you have any suggestions

 

Good question.....

 

audio geniuses? i know your out there..