Mao

I drive an evo VIII with the SSL package and I've noticed that some sounds on my right speakers drop off or don't work and the subwoofer in the trunk isn't working either. The speakers aren't broken as there are some sounds coming through but it won't play through a few notes.
So far I've checked the connections to the radio console to make sure they are plugged in correctly which they are and checked to see if my cd/mp3 players weren't broken.
Is there anything else that might be wrong with my sound system?

Edit: To the mods: If this thread is out of place please move it. I figured since it was an audio problem I could post it here.