Speaker Problem

Hi, I am asking for advice because I let my brother's band borrow my Steelsound 2X10 and my Hartke Model 2000 Bass head for band practice and I get it back and the right speaker rattles when I play low notes. I press my hand against the right speaker and it doesnt sound as bad, the left speaker does not rattle at all., the high notes sound fine. Maybe the cab was just a piece of junk in the first place, I don't know but its never sounded like this and I've played a few gigs with it and its never sounded like this. I got it back and the master volume was on 9 but the pre-amp blend was at 3, maybe this caused it, I'm not sure. It still plays but it sounds sort of muddy and rattles. It almost sounds like there is something in it rattling. I'm not sure what the cause of this could be. I don't know much about speakers and whatnot. Any advice would be appreciated. thanks.

 

I took the speaker out, it was in there with screws. I don't know though. Maybe that is the problem. Maybe someone dropped it. The speaker isn't ripped or anything so I'm just clueless as to what it could be.

 

At very low volumes i touch the E string and it sounds like a garbling sound. Almost like a wah pedal is on.

 

How would I got about gluing it back together?

 

So I should take the speaker out and glue the speaker back to the surround? Sorry, I'm not exactly a visual learner, nor do I know much about the dynamics of a speaker. Thanks for you help.