Vandersteen 2W Sub Repurpose?

Thank you for the gentle replies! I can do a "core" exchange through Vandersteen direct. That would cost slightly more than a Behringer NX3000D amp. The Vandersteen 2W is, as everyone states, "long it the tooth"  Even Vandersteen commented to that.

So an external amp allows future flexibility with other passive subwoofers. But even that has become a difficult comparison for me. 

Behringer NX3000D has ostensible advantage of DSP 
Vs.
1. RBH SA-500DSP (500W x 1Ch 4 ohms) - Subsonic Filter from 16Hz to 40Hz in increments of 1dB (16Hz, 17Hz, 18Hz, etc.).
2. Yamaha PX3 (500W x 2Ch 4 ohms ) - Subsonic Filter down to 20Hz.
3. Dayton SA1000 (1000W x 1Ch 4 ohms) - Subsonic Filter Fixed at 18Hz.
4. Klipsch RSA500  (300 watts continuous into 8 ohms or 500 watts continuous into 4 ohms)  LOW PASS CROSSOVER Continuously variable from 40-120Hz, designed for Klipsch subs.

With a gun to your head, which one? I'm sure I'm overthinking this...
Thanks again Genius Network!

I still say contact Johnny Rutan for the best info.
He knows Vandy as well as other brands and can give honest advice.-And, potentially saving you money/headaches.
Bob

Core exchange, plugs right in away you go....

Vandersteen since 1977 for a reason !!!

@gdnrbob...Johnny Rutan...what an ACE!  God, I relish for the days when you could find competent people, that know how to banter and are 100% confident in their advice.  Thank you!  Would love to belly up on barstools with that dude!  For the record, I'm sending the plate amp in to Vandersteen.  Wow!

See?
I wouldn't steer you wrong!
Johnny is one of the best, (and, I have been at this since the 80's), I know you are in good hands.
And, Jim (Tomic601) is right up there with him.😁
Bob