You can definitely do that or more but they won’t be hidden. An enclosure for a single 10 or possibly 12 is all the room there is behind the rear panel. The Thunderform uses all the available space and the volume was just enough for my JL 10W3.I've looked all over for one left over for sale but no luck. I think I might get a little wild since its gonna be something custom. 2 JL12W3s and a 1,000w amp should be more than I will ever need.