Yea the application it was built for the owner demanded that everything be firing up so there was no way to do a single 6". The pricing we have listed in our section is for net ft3 meaning you would need/want an enclosure around 4ft3. Ported pricing is for slot ports mainly, but typically can be adjusted for precision ports as well. They also do not include shipping, but I can get you a quote if you need it. They also come stock with a double baffle, bracing, and all that. Yes, obviously in some cases I went against that for builds like the enclosure you went with, however, we do strongly recommend using proper bracing. Some times our customers just want what they want and we make a judgement call on if we will build it or not lol.