Vandersteen Sub woofers v Rythmik Subs


I really love the idea of the Vandersteen Subs where they are connected with the mains via extra speaker cable off right and left channels off the main amplifier, which is supposed to provide better bass transition from the mains while keeping the signature from the main amplifier. My question is with Vandersteen coming out with the SUB THREE and the price going significantly higher, I was wondering if there are other subs for less that you could integrate in the same way. (Most subs seem to rely on the line level input which is just a sub-woofer RCA going from the pre-amp to the amp on the sub). Can this same Vandersteen set-up be achieved with other subs?
I picked Rythmik since they are known (in the home theater community anyway) for being one of the best bang for the buck subs and the most "musical" of the bunch. (between Hsu, SVS, PSA).
And could I possibly achieve even greater sub-woofer nirvana since I could get an 18" for around $1500? Vandies only have 3 eight inchers.

I am a Vandersteen fanboy and I would like to support RV whenever I can, but don’t know much about my other sub-woofer options so looking for some feedback. Doesn’t even have to be related to Rythmik necessarily. If you know of other subs that can integrate the same way I want to know about it!

Thanks
bstatmeister
As I'm not a DSP user for home audio (or pro audio for that matter, although I utilize graphic and parametric EQ in pro mixing work) as it seems to rob a little of the soul from music (my imagination possibly, and this opinion is based on listening at length to a friend's rig). Note there's a REL Q150e on Ebay for cheap...I have one and it's amazing. I get the swarm idea as it makes perfect sense, but the REL "high level" thing also makes sense, and works for me. I now have my smaller (downfiring 8" speaker) REL in a permanent corner behind the left main, and my Q150e now can be moved away from the corner if I want it closer to the right main speaker, and that offers some other tonal response options I like to hear. Moving a speaker around is about as analog as you can get, and I like it.
Hello wolf_garcia,

     " Moving a speaker around is about as analog as you can get, and I like it."

     Since you seem to enjoy experimenting, I thought you might want to try positioning your REL-Q150e at your listening position then walk around your room listening for the spot you think the bass sounds best.  
    It's a very good possibility that locating your Q-150e at the spot you thought the bass sounded best will provide the same bass quality at your listening position.  
     If the spot makes sense functionally and aesthetically, you may be pleasantly surprised at the sound quality.

Just something to try,
   Tim
so got rid of the Samson S-convert and now running strictly unbalanced with my TS connectors, I must say the biggest difference has been the decrease in background noise. On LPs the back ground hiss is barely noticeable and have to get right up to the speaker to hear it - and this is at a decent volume to boot. I did not get a proper sense of differences in sound stage since I have been unable to position speakers for prime listening at this point. But I have been very pleased with the results so far and only wish I would have done this years ago.

Because of this it will help me implement the 2wq subs in a cheaper manner (starting with the WX-2 variable cross-over to figure out the best setting for my amp, then purchasing the fixed cross-overs based off those results) - Although I do wish I could get the HP-5's, it's not realistic for me at this point financially.

Now if I can just find a good deal on a 2wq or two starting on July 1st...
(Financially this would be the optimal time)
The HP-5's are really the way to go. If you buy them new, make sure you give them ample break-in time. When I first got mine, new out of the box, they sounded only marginally better than the X-2's. But after 4 to 6 weeks, WOW, did the sound ever open up! It caught me by surprise when I started to notice it. At first I wasn't sure what I had done to improve the system so greatly. But then I remembered. I tried the X-2's again and the sound just closed in. The bloom was gone, air around the instruments and vocals almost totally dis-appeared. I was in a financially constrained condition also, but eventually was able to spring for the new HP-5's. If you ever find a used pair with good batteries, go for it! And good luck!
As far as what impedance to match the cross-overs at - I noticed that my amp has an impedance of 10k ohm for balanced connections. Does this mean that I should match up the WX-2 to 10K? I have heard that people often find that they get better results if they go one step lower. so in this case I would go to 7500K? Does the WX-2 go this low?