The box looks decent enough. The drivers look like car audio drivers.
But the thing that conserns me is the amp. If those are 4 ohm drivers, they have to be wired in parallel, cause series will put an unbelievable load on the amp. And if they are 350Watts each, that amp will not power it to very high levels.
For 1500Bucks, you can get better. Especially since this is rated to 25Hz. My DPS-12 has the same rating, which happens to be true.
SheepStar