Subwoofer Decision


I have narrowed my search to two choices though I am sure I will get comments steering me away from these.
Contrast Rythmik Audio 12G with Vandersteen 2Wq. I would like to get only one though I know a pair are best choice. Could maybe afford 2 Rythmik, but only 1 Vandersteen for now. The subwoofer would support Dali Helicons (4 ohms) biwired and driven by 2 mono McIntosh MC 252's at 500 watts each into 4 ohms. Living room size aprox. 24'x16'x8' placement not centered on 16' wall due to furniture (wife) constraints must stay put. Subwoofer placement needs also to stay there as well, I know this limits possible best choice for placement, my bad. There is room behind, next to, and between speakers. Any help help is appreciated.
128x128lowfreqguy
Have you considered the Swarm? Multiple subs, single connection, rave reviews. Worth a look or listen...

lowfreqguy, Rythmik sells direct-to-consumers only, but have a deal worked out with speaker maker Ascend Acoustics (who also do direct sales) in San Clemente, CA. Ascend sells the Rythmik subs to partner with their speakers, and I believe demos the subs at their location. Give ’em a call.

I’ve never seen a Rythmik F12G for sale used, a good sign, ay?!

Jadedavid’s passive filter suggestion is a good one, and has been used by perfectionists since the 1950’s. He’s correct about the Dahlquist DQLP-1 incorporating that design---I still have one. I also had capacitors installed on the input jacks of my Bedini 25/25 for rolling of it’s low end for use with old Quads. That method is completely compatible with Rythmik subs.

By the way, the Rythmik F12G is available as a DIY kit, for those wanting to make their own enclosure. Also, Parts Express sells really good sub enclosures the Rythmik kit can be installed in, for the adventurous. 

maybe I misunderstood your point bdp...but the Vandersteen approach preserves the transfer function of the main amplifier which can be heard...Ray Brown Soular energy is an excellent test for continuity....

so glad the OP is working the tools and the room also..

i have a place near San Clemente, so maybe I will pop in and hear the Rhymiks....
I too, have not heard the Rythmiks, but from the standpoint of the laws of physics, it would seem to me that a sub with three eight inch drivers would be a lot quicker than a single 15 inch or even a 12 inch driver. I thought I had read somewhere that three eight inch drivers could equal a sixteen inch driver  in bottom end extension and power.JMO.
Vandersteen sub integration is seamless, when properly set up. My 2w's and 2wq's are heads above any other manufacturer, in my opinion.
The fact that my 2w's are nearing 25+ years old and still function properly is a testament to the design and build quality.
B