I recently purchased a pair of these for my rear surrounds. They blew me away. I was expecting small sound from a small speaker but the 4" polycone woofer packs plenty of punch. They are also equiped with a 1/2" tweeter.
They have a really handy mounting bracket that allows for 6 different setting one they are mounted.

I can truly recommend these to anybody looking for great surrounds or even as a start-out for mains. And for the price you can't do better.