Passive subwoofer amps help!

I acquired two massive subwoofers (over 230lbs each) that were mated to a $100k+ custom system and I need to power them somehow. In my limited research, I'm a bit confused about all this.  I'm used to my subs being powered.  The subwoofer amps I've found by Dayton Audio seem to be very lower powered.  Can I just buy an SVS PB16 amps off ebay and build a box and use that? That gives plenty of subwoofer power and the ability to control with phone. Or is that a big sin in the subwoofer world?  Why are there not more external high powered solutions for this with a volume knob, low pass knob, and phase switch on the front. 

I did look at the Klipsch RSA-500 but it specifically lists the subs this amp is to be used with.  Also, for $1k+, it's not that powerful.



Looking to Behringer or QSC amplifiers with DSP. Suggestions from pro audio or your nearest guitar Center could be of help.

These were some subwoofers designed and made by Destination Audio to be paired with horns on top. All together, the speakers were in the $50k range. They were a one-time build and apparently tuned down to 20hz.  If you look up the Destination Audio Nika speaker, the bass section is identical to that except without the horn tweeter built in.

What if i don't want an amp with DSP?  What would you choose? Opinions? I'll just use the DSP in my Anthem.. Probably better to keep things simple.

Dayton Audio makes a thousand-watt shelf-mount Class AB subwoofer amp with controls for phase, low-pass frequency (4th order slope), and gain, and it has a single band of parametric EQ.  It's called the SA-1000. Available from Parts Express, Part Number 300-811.