yes, as you said .. 2 on the rear side and 2 on the rear back. But, unfortunatly last night I didn't mount on of them or check to see it was actually lock in on the mounting t bar thing and on came crashing down 6 ft. took out a light switch, night lite and smashed the bottom grill and broke the front edge. So now I am 6 channel not that it will matter much. But will have to re order and I will bet the new ones will have a different tone than the 4 year old one I had.

Pioneer sc-1525
M80 HG Cherry