Im not going to try to rain on your parade, but you need to be aware of some things. I dont know whom you talked to at what company exactly, but what they're suggesting to you what will be "ok" as far as box size and tuning is not quite up to par.
First off, beware of the dual spider... it WILL rip to shreds around the tinsel leads at some point or another, especially with a low tuning of 30 hz. I would buy some CA glue from bob smith industries or loctite to keep on hand so when the tinsel leads start to stretch off the spider you can dab a bit on here and there to keep it together longer. I hate to say it but ive seen what happened in those pics above on about 10 or so drivers now.
Second, beware of the backplate tattoo. If you ever over put the driver into over excursion the coil will slam into the back plate which will transfer the energy in reverse to the center of the cone which will either give the cone a tattoo the size of the voice coil, deform the former, or outright lock up the coil.
One thing that is true, the coil will take around 10kw of straight power. The downside to this is that the mechanics of the driver in general just cant take the force. IMO all about it can take is around 4k.
good luck.
