2001 speaker sizes/locations

First off, I'm not sure if I have the 6 or 9 speaker system. The only speakers I've been able to locate are the two on each front door, and the ones on the rear deck. However, the car also has the stereo control thing on the steering wheel (which I thought only came with the Concert III system), and I *think* there is an amp on the rear seats. There is some sort of plastic casing over the rear seats when you look in the trunk, I pulled it off and it looks like an open cased amp. I wasn't aware the Concert II came with an amplifier? If I do in fact have the Concert III, where are the other 3 speakers? and is one a subwoofer?

So yeah, If I could get the specs on location and size of each speaker it would be a great help.

If you have a 9-speaker setup, there will be a 5 1/4 inch speaker in each front door along with a small 3 inch tweeter. There will also be a small 3 inch tweeter in the middle of the dash. All this accounts for 5 speakers in the front of the car. Located in the back and on each rear door, are 3inch tweeters as well. Finally, in the rear deck, sit 2 6x9 inch speakers. Altogether this is 9. And yes, there is an amp located under the driver's side 6x9 in the trunk. I think it's around 150 watts, and it powers ALL 9 speakers.