I am looking to expand my live rig, unfortunately I don't really know much about matching up cabinets. I recently purchased an acoustic b800h. I liked the price, and the power. I am running two sunn 2x15 cabinets both at 16 ohms for an 8 ohm load. While this may not be sensible, I am thinking I can probably get away with stacking another cab, perhapse a 4x10. If I were to do this, should I look for an 8 ohm cabinet? If I did the math right the end result should be a 4 ohm load.......I think?