I found these in one of my MR-S imports. They are uprated toyota speaker, only rated at 15W but were powered by a small Toyota amplifier.
They have been fitted perfectly to the rear storage doors and the amp is under the rear passenger bin. The extra loom runs around the car under the sills and to the back of the stereo. I was really surprised how loud and clear this made the music.
Obviously another J-Spec extra. I will get some pics of the amp and mountings
(http://www.gt-international.com/MR2ROC/speaker.JPG)
(http://www.gt-international.com/MR2ROC/speaker1.JPG)
(http://www.gt-international.com/MR2ROC/speaker2.JPG)
I used to have these in mine before i added components (no sign of an amp though)!