prelude rear speaker

I was looking to replace all the speakers in my 95. I just was wondering if anyone knows about the speaker in the middle of the back seat. Is it just there for looks or does it actually hook up and work? There hasn't been any sound from it since I got the car, but I don't think it has ever been replaced before cuz it is alpine and all the other speakers are JBL. Any help is greatly appreciated. Thanks guys!