Hi i have an 04 G35 and after after a few months of owning it, i noticed that the speaker in the back, right above the trunk doesn't give out sound except for bass.
I wasn't sure whether that was actually a subwoofer or whether it was a regular speaker that just wasn't working to full extent.
I know that there are 4 door speakers but for some reason, music just sounds a lot better when in the driver or passenger seat.

Any tips on that rear speaker?

 

It's an 8" sub. I hardly even hear it. The mids in the doors outpower them.