I used to have an old huge and Fn heavy Ampeg standup 412(it was skinnier than a 412, like a wider 212 stood up on its side twice). For Bass; it had some craptastic old Eminence in there with those strange magnets. That thing had a ton of low end (Surprise lol) and used 12' speakers. They also made a 6x12 as well. It was a tilt and roll with the one handle on top, 2 casters on the bottom.
Find one of those and re load it with your fav speakers..
Or, just get a subwoofer.