Two JL F212s verses two Velodyne 18 plus?

Clean output capability and damping control would be my top priority, were I in your shoes.

I suspect that either of your options will be great in your modestly large room (on that basis), so you probably can't go wrong, but...

If you don't have Audyssey or equivalent, then I'd add stand-alone Room EQ (at least for the subs), if you choose the JL. SVS sells a bass-only version for the sub signal - under $1K and, judging from my experience with the similar Velo SMS-1, a critical component of good sub performance.

The Velo DD series includes an excellent version of this approach, and I'd choose it over the JL (which includes a more rudimentary version) on that basis, but....if you already have the capability in your Pre-Pro/AVR, I'd probably go JL.

You might want to look at some other options, as well. A pair of the big Rythmik dual driver subs (F25) will be far less expensive and (based on my experience with their smaller subs) probably still provide top notch perforance. SVS also makes a highly regarded product that's a lot less expensive than the big JL or Velos.

Good Luck

Marty

My anthem statement D2v has the ARC equalization system, which many think is the best on the market. Would this be enough? Would I also be able to utilize the DD15 equalization system I already have? I am getting the sense that many are suggesting they are both great choices with the majority leaning toward the JL F212s if they can be integrated and equalized well. If however the equalization process is not utilized the built in system with the velodyne would be better and also an excellent choice.

For what it's worth, I followed Mitchell going from the DD 15's to the JL Audio F113's in previous discussions. I consider him true to actual performance over brand loyalty and I trust his evaluation.

I EQ'd my sub before running my Pioneer SC-07 receivers room correction and then did a slight manual adjustment.

I did have a dealer tell me they were going to sale their 1812 demo for $5,000 which is a great deal but stated the flexability of two smaller subs for my application might be best. If it wasn't so far to audition I would like to here the 1812, but would unlikely purchase two.

I'd drive down to the dealer and listen to the 2 subs and then the 1812.
I wanted flexibility with two also,so I'd have a nice blanket of bottom end for the music.Which I got, but I swear nothing I've heard comes close to the 1812 Ive mentioned even with two subs.
No matter where I sit in my room I get that midbass punch,
It's so addictive,and mids and highs are so clean.
Too bad you can't do a weekend drive.
If I had to drive further South(another three hours)to get the sound that's killer,I would,but that's me.
I guess I really strive for the best sound I can get,fianlly
after 6 subs and half dozen years I can rest now as my sub hunt is over.
Hopefully you can do the audition.