Though the total impedance might be 8 ohms, it would require too much voltage to put any decent amount of power to each one; they'd all be coasting along-
Rat Shck Presidian 40-5053. Next Sonic Impact?
I just bought a pair. Supposedly a guy from the Connecticut Audio Society bought a pair for his video system and couldn't believe how good they are. He was floored.
http://www.radioshack.com/product/index.jsp?productId=2104336&cp
http://www.radioshack.com/product/index.jsp?productId=2104336&cp