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
" noble100 ,
I think Johnny was referring to the integrated equalizer in the new Sub 3.
As far as I know, there are no subs with equalizers incorporated."

Hi gdnrbob,

     Thanks for responding for audioconnection/Johnny.  

     I understand audioconnection/Johnny is a home audio retailer with Audio Connect in N.J. that sells Vandersteen products.  He seems to be justifiably enthused about Vandersteen's soon to be available Sub Three.  It appears to be a very nice sub for $2,500.
     However, implying that incorporating a 7-band analog equalizer in the Sub Three demonstrates 'thinking outside the box' is a bit of a stretch.  The truth is that it's basically a conventional sub with an equalizer added.  
     An equalizer will not be able to eliminate, or compensate for, the vast majority of bass standing waves that inevitably result from having a single sub in a room.  With proper positioning, the best one could expect to achieve would be good bass response at the preferred listening position.  This will hold true for all single sub systems, no matter the cost or competency of the single sub employed. 
     As I understand it, analog equalizers such as those incorporated in the Sub Three and the Swarm's sub amplifier are useful mainly in compensating for any bass 'slap' present in some rooms that is caused by the reflection of bass sound waves off the floor and to the ceiling.

     The above is not just my opinion.  It is a summary of the results of years of scientific research and experiments conducted by acoustical scientists Earl Geddes, Floyd O'toole and Todd Welti, among others.  
     These experts state that deploying 2 subs will result in fewer bass standing waves and better bass response in the room.  Deploying 3 subs will further significantly reduce bass standing waves, 4 subs will eliminate the vast majority and any additional subs beyond 4 will only result in smaller incremental improvements  in bass response in any given room.
     However, utilizing 4 Vandersteen Sub Threes would cost about $10,000 while the complete Audio Kinesis Swarm or Debra 4 sub systems both are priced at $3,000 or less and likely are less intrusive.  

     I'd imagine the Sub Threes would definitely produce more bass than the Swarm system but I'm not certain which system's bass would sound best and, if the Sub Three system did sound best, whether it sounds $7,000 better. 
 Tim     
  
@noble100 ,
I would not discount the Sub 3 until I listened to it. If Mr. V. discontinues a very good sub in favor of a new one, it must be a significant improvement.
And, Vandersteen's use of an external high pass crossover was very much 'thinking outside of the box' 30 years ago, so maybe Johnny isn't exaggerating.
I understand the concept of using multiple subs to eliminate/ reduce room nodes, but perhaps integrating an equalizer can achieve something the same. As I have not heard, nor know how they are set up, I can't say definitely how well/badly they work. 
Maybe they will be in the store when I get some time to go later this summer-along with some other Audiogon members.
Bob
@noble100 , @enginedr1960,

What's the crossover frequency and slope of the Swarm system? I understand the xo is before the Swarm amp and all subs operate in the same frequency range, summing up L & R.

My system is set up so the sealed subs cross at 80Hz to the mains, which have dual 6.5" midwoofers per side on vented boxes. I'm building new speakers with dual 10" per side in sealed boxes and hoping to reduce the xo frequency to maybe 60Hz.

Great bass everywhere in the room would not be prime Vandersteen design objective
great bass and the rest at a very optimal listening position is.
hence lots of out of the box  ideas implemented over the many years by RV ... out of the box which is a metaphor for innovation, not more boxes = out of the box....
anyway just a few that work together as a system to create the stereo illusion...
power factor corrected amp optimized for drivers in sub
transfer function of the main amplifier preserved - very important to preserving lower midrange phase integrity
high pass filter adjustable for amp
time and phase coherent
minimum baffle
eq bands not at fractional octaves to address common room nodes ( that one if ya pay attention is way out of equalizer box theory....
push pull aluminum cone sub in the 5 etc
carbon fiber cabinet inside a cabinet..
the list goes on

" What's the crossover frequency and slope of the Swarm system? I understand the xo is before the Swarm amp and all subs operate in the same frequency range, summing up L & R."

Hi lewinskih01,

   I actually own the Audio Kinesis Debra bass system (a very similar system to the Swarm that I bought from James Romeyn Music & Audio in Utah that he is licensed to sell under the Audio Kinesis brand).  Both systems use the same 1K watt sub amp that contains an active xo with a continuously variable low pass cutoff filter that ranges from 20-200 Hz  that I usually set at 40 Hz.  Sorry, I'm not sure of the slope.  All subs operate flat from 20-100 Hz with 113 db output @ 20 Hz, are 4 ohms, are fed the same l+r summed mono signal, have 10" drivers and can handle 600Wrms. 

     Here'a link to the exact Debra bass system I own:

   http://jamesromeyn.com/old-pages/home-audio-gear/dsa-1-0-distributed-subwoofer-array-5-pieces-4k-usd... 

Tim