I really don't know a whole lot about this kind of stuff, but my uncle is sending me a 115 speaker cabinet. The speaker inside, however, is a PA speaker. If I wanted to convert this to a bass cab to go with a 410 to add a bit of low end would I just have to buy a bass speaker and replace the current one? Or would I possibly be better off using this for some other purpose that I am unaware of?
Just try it the way it is. You cannot just swap out the speaker with another and expect it to work properly. Paul