Does anynone know what other brand of subs you can put in there besides MTX?

 

Well my friend, Technically, you can put in any sub in the boxes that you want. Just be aware, Mtx designed their thunderform boxes to be used with MTX subs so the boxes have a specific Volume set to be used with matching speaker. If you want to use something else, try to find a speak that takes up nearly the same amount of Cubic inches as the speaker MTX uses. Good luck and enjoy!