So in doing some modeling, assuming the T/S parameters are correct, it appears as though this driver was designed for sealed/PR use. The reason I say that is because the size enclosures required from a vented standpoint. The issue I see in going vented is the vent length, at nearly 80" to keep vent velocity below compression with 500 watts RMS in a 95L enclosure. The response looks great with an F3 around 17.5 hz and an upper -3db point of 87.4hz with a 4th order low pass at 80hz.
Going the PR route can put you at a smaller net enclosure volume (no need for vent displacement) and yield nearly the exact same performance as a vented application. Below is the SDX 12 modeled in 3.50ft^3 with APR15s (purple trace). Xmax is well in line and the lower and upper -3db points are nearly identical to vented without the hassle. The other big advantage here is that you would avoid vent resonance issues which would likely be entirely present with the vented application unless using a VERY steep filter on the low pass.
In either application it would be advised to add a 2nd order infrasonic filter at 14hz, which will have minimal impact on response and f3, perhaps pushing it up by about 1hz or so but would greatly help to protect the woofer.
If these are my drivers, I bite the bullet and go the PR route...