How Do I Adjust A Subwoofer For Best Sound?

The speakers in my doors are coaxials. That is, unless I don't know the definition. lol
man, i'm such an idiot at times, yes, your right, your speaker's are coaxial. it's been years since i built my system, so i've forgotten what coaxial actually is, in the back of my mind it has resulted in that it is a two way, or three way speaker, etc.

i came up with that as looking for a speaker with "coaxial" in the description. this is the speaker i thought you had, i was completely off base with what i said.

Kenwood eXcelon KFC-X174​


what a dumbass i am.
looks like you have lots of help. good luck.