Here is your celica link for the wirings, not sure if this is what you are looking for, but thats all i can get. http://www.directechs.com/wtechsoft/doc/53127.txt

As for sound quality, having 2 smaller subs will usually sound better than one big one, but its really up to the listener. My car sounds excellent, for one big sub, but i still give a slight advantage for 2 subs. With an untrained ear, you won't notice that much difference. I have just had experience with both kind of setups now for years, so i can relate to each setup. Unfortunately, this is kinda something you have to listen to in person to tell, wish my car would play over the net Either way you go, you will be happy with the reslult. My one 15" sounds good as hell, and is plenty loud for me..

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)