What are my Ford Sound System/Audio specifications?

I have a 1999 Ford Explorer XLT Rear Wheel Drive, 4.0L V6 SOHC.

I would like to know exactly what's going on with the factory speakers & sub woofer (If it has a sub woofer?) as far as sizes, quanity, and locations goes.

My factory speakers are going out and I'm looking into upgrading my system. I'm not looking for flashy, I just want quality and longevity.

Thanks for your time and consideration! -Michael V.

Generally, Fords have 6x8's in each door. Probably 5-10w each.
They've used the same basic setup in several different vehicles since the 80's.
I had an 88 Tbird, '00 Contour and '99 Taurus that all used the same setup. The Taurus had the "premium" jbl setup which added tweeters to the doors, but it was still 4 6x8's.