Originally Posted by billy1
I believe that they are subs. But I have had my ear to them and nothing is coming out.
As everyone pointed out, they are sub-woofers. To see if they are working, put on some rap music (or anything with bass) and crank it up. Then put your hand on the woofer and see if you feel anything. If you don't feel the air pushing or vibration, that means your subs are not working properly.