sub issue

I don't know much about the stock audio system in the tacoma. I have the JBL upgrade with the 8" sub and it's a 2010 trd sport. Today the sub stopped hitting like it used to. I only listen to rock so it's not like I'm bumping everywhere and I leave the bass level on 0 but I do like loud music. It's putting out a little bit but I can't hear it at all unless its turned up a bit. It just doesn't sound normal. I checked the two audio system fuses (i think the numbers were 11 and 23) and they are still good. I even switched them out to make sure. I didn't see a specific fuse for the sub, is there another fuse I can check?

Any ideas what the problem could be? I'm no expert but I had a couple 12's back in high school lol. I blew a couple of those and this doesn't sound blown to me it just seems like it's not getting power. I'm assuming there is an amp back there? I pulled the seat forward but didn't want to start taking stuff apart. The rest of the speakers are fine. I'm really hoping it's not anything expensive and maybe just a fuse or wiring issue. Thanks for any help!!

Tyler