So, I am trying to figure out how to pair speakers. I understand that bass cabinets have thicker speakers than guitar cabinets, so that they will move the air and vibrate with the slower frequency of the bass, but I'm wondering at what point does the speaker size, as in its thickness, switch from guitar to bass. Also, would subwoofers like the ones "really cool" people put in their trunks do anything with a bass cab if you linked them? Weird idea, but yeah. Thanks.