The SA-12 is a very nice driver... Definitely something that can be worked with.
Driver details:
https://sundownaudio.com/lv/sa/subwoofers/sa-series/
The DVC 4ohm wiring is a little tricky as you'll need to either choose 2ohm or 8ohm wiring options.
2ohm will limit amplification options & become more expensive as will quality plate amplification...
SpeakerPower's SP1-2400 plate $1089usd delivers 1250w RMS into 8ohm (little more than needed) but offers you the ability to preselect a HPF & adjust delay 0-20ms.. An expensive option though.
External pro amplification with DSP is your best choice..
If doing a single subwoofer, wired to 8ohm (recommended) any of the Crown XLS series from the 1502 -2502 will work bridged mono 8ohm, they have power limiters in place & a 30hz HPF to protect the driver baked in.
If added DSP is required or desire to adjust filters/slopes or apply house curves you'd need a MiniDSP 2x4hd.
If dual subs you can wire to 2ohm & use a XLS2502 2x 1200w/2ohm $729
This is a review and detailed measurements of the Crown XLS2502 DriveCore (switching) 2-channel amplifier. It is on kind loan from a member. The XLS 2502 cost US $645 including free shipping from Amazon. It has DSP functionality which I did not test. And is specified to drive 2 ohm load...
audiosciencereview.com
Behringer's NX3000D model with DSP would be a great solution offering 800w/8ohm bridged, adjustable power limiter & user selectable HPF (plus DSP options) Currently just under $389usd
If you aspire toward dual subs down the line then its the $550usd NX6000D with 2x 800w/8ohm & all the features listed above.
If you'd like to dig into this more & see how the driver will function in your enclosure (or build a new one) then I'd recommend researching WinISD.. found here...
http://www.linearteam.org/ & following this video tutorial.
Best of luck on your future project.