Vandersteen Sub woofers v Rythmik Subs

No need. I can do the math.

Certainly the load the main amp sees can influence the sound
jn a properly designed system such as Vandersteen the transfer function of the main amp is preserved, the sub amp is optimized and power factor corrected to properly drive the sub and present a fairly benign load to the main amp
most people think the sonic virtues outweigh any small math issues....

@ieales   What cred. would you have to "correct" Mr. V.?  😯

     When did Vandersteen start positioning, considering and pricing themselves as an ultra high-end company?  I've always considered Vandersteen as a solidly high-end manufacturer that offered very good quality speakers, subs and related crossovers at  more reasonable prices,especially considering  their proven history of high quality offerings.
     I was just checking out the new Sub Nine on their website.  I haven't heard them but from their description and look, they certainly seem like another fine Vandy product.  But I was a bit shocked by the $18,900 per pair suggested retail price.   The very fine Model Seven MKII are also very expensive at $62,000 per pair.They  are now even selling a pair of 600 W@ 4 ohms mono-block amps that have tubed input stages and bipolar transistor output stages (M7-HPA) for $57,200.
     So, if you want the best all Vandy system while optimizing in-room bass response, you'll need the Model Sevens, the matching mono M7 amps along with the extra pair of Sub Nines to optimize the bass response.  This will set you back $138,100 but you'll also get a pair of nice Audioquest  cables gratis.
     Undoubtedly an excellent audio system in almost anyone's estimation but not the better performance than expected for the price that I remember when I was speaker shopping in the early 1980's and auditioned the 4C. 
     I'm not sure if anyone on this thread is seriously considering the Sub Nines but I cannot understand why anyone would pay $18,900 for 2 subs when they could buy the Audio Kinesis  Swarm or Debra bass system with 4 subs that will likely provide better in-room bass response for $2,500 and save $16,400 in the process.  Yes, the Nines may produce more bass but I've never had an issue with the bass quantity ( or quality) with the Audio Kinesis.
     It's similar to what I recall from past Vandy products:; a product that offers better than expected performance  based on the reasonable price. . 
     Anyone know why Vandersteen decided to move away from these type of products, like their former 4C speakers, and toward the more expensive and esoteric?
Tim    

My guess is Richard has realized, through R&D, very significant improvements in the sound quality of his offerings over the decades and has decided to go for the ne plus ultra to see how good the realism of his designs can get. Listening to the Treo CTs daily, I need to hear the Model 7 system to realize how far he has been able to refine his design concepts. As is so prevalent among many successful audio designers, Richard is reaching for the stars. Of course, in result of this lofty pursuit, those of us downstream, benefit from his efforts as he incorporates the lessons learned into his more modestly priced offerings.