Hello, I popped in The Matrix last night, and it seems that my sub is no longer working. Well, not fully working anyways. I was getting barely any bass. I would get it with big explosions, but not with things like when punches were thrown and such. I know I used to get some nice bass response, but not anymore. Normally I keep my receivers sub level at 3 (out of 10), but last night I had to crank it up to 9. The volume level on the sub was still in the same place at half way up. So, does it sound like I need a new sub? Any suggestions? Thanks a bunch.