Subwoofers and Phase Question For You Sub Experts

I have a large room which requires large subs. I have had 2 SVS powered subs for around 10 years that I futilely attempted to integrate. The biggest issue is the carp adjustments on the power plates, starting with the volumes control that raise volume too high when barely turned up from zero. These at least have a sweep Phase which does allow for other than 0 or 180.


I never had the negative sound stage experiences you mention, but could never get them to blend seamlessly, but when the Polarity/phase was out (on numerous discs), reversing the bass Phase/polarity solved the problem, no matter which main speakers. I had Magnepan 3.5Rs, Usher 6371s, and Emerald Physics KCIIs. Most likely an expensive active XO is needed, but my system is all diff balanced, which makes active XO in the price range of new speakers


I am attempting to eliminate the integration problems by replacing the KC IIs 10" woofers and eliminating the subs with EP 2.8s as each speaker has 2 @ 15" carbon fiber woofers. should they ever show up. They ave a few pair of these $10K speakers available for 50% off including shipping
hth

Erik, what you dont seem to understand is i have ultra perfect high standards. I have heard many high end speakers, and they sound dreadful. How do you explain this? I see and hear problems that seem to elude experts like you. Why is that? Your speakers are nothing more than box speakers. They are equivalent to every other box speaker both in their strengths and weaknesses. The differences that do exist between your speakers and every other box speaker, are immaterial.

     The truth is that the 4-sub Distributed Bass Array (DBA) Concept actually works like a proverbial charm!  There are no ifs ands or buts, no maybes, no under the right conditions, no excuses, no fear and loathing, no terms, no conditions, no stipulations, no hidden clauses, no fine print, no oils and no qualifiers whatsoever.  
      It's the cat's pajamas, the bee's knees, good as gold, tits, right as rain and too legit to quit.  I believe it's the gold standard of sub systems that all others should be judged against.  
     Based on the 4-sub DBA's near state of the art bass quality, I actually continue to be amazed that it isn't more widely known, accepted and utilized, especially by fellow Audiogon members who are typically keenly aware and accepting of high quality audio related concepts, technology and methods they can utilize to increase the performance of their systems.  Heck, the main reasons we're all members is that we enjoy good music, realize high quality audio equipment, technology, concepts and methods are capable of increasing our systems performance and musical enjoyment as well as enjoying learning of, discussing and sharing this information, Right?
     The very relevant and utilitarian concept of the 4-sub DBA isn't exactly new, either.  I believe it's about ten years old and began as a spark of an idea that Duke Lejeune, owner of Audio Kinesis, had while having a conversation with his friend,Dr. Earl Geddes, about the results of the doctor's research and experiments on in-room bass performance in smaller room environments. Dr. Geddes stated that his research indicated to him that 4 well distributed subs in a room reliably provided the best in-room bass response performance regardless of the small room's dimensions or main speakers utilized.  This knowledge was the impetus for Duke creating his 4-sub Swarm DBA system that has won multiple product of the year awards (2015 and 2019):
2015:
 https://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/
2019:
https://www.theabsolutesound.com/articles/2019-golden-ear-awards-robert-e-greene/

     
      
       I've utilized an Audio Kinesis Debra/Swarm 4-sub distributed bass array (DBA) system for about 4 years now with a pair of Magnepan 2.7 QR main speakers.  I use my system both for 2-ch music and for 5.4 ch surround sound for HT.  I now use it with a pair of Magnepan 3.7i main speakers with equally excellent results, I just needed to adjust the volume and crossover frequency controls on the sub amp/control unit a bit.

Kenjit,
To paraphrase your post in another thread:

I refuse to engage with you unless you can prove to me it would be worth my time.

Rooze, it is a complex issue. Properly set up subs should improve sound stage and clarity. Speakers that benefit most from subs have woofers that run up higher above 500 Hz. Full range speakers like ESLs benefit most.
Ideally the sound from the sub should reach the listening position at exactly the same time and at exactly the same phase angle as the woofers in the satellite speakers. Subs work best against a wall and better right in corners. This is usually not going to be time or phase correct. Some woofers like the JL Audio have adjustable phase angle which helps but this does not correct the time issue. In most cases you would have to delay the satellite approximately 0.3 milliseconds each millisecond being equivalent to about 1 foot. This can only be done digitally. So in order to put subs in the places they work best and integrate them to the satellites you have to have digital bass management. If all your sources are digital this is not difficult. A dBx DriveRack will do the job. Digital room control processors like TACT, Anthem and Trinnov units will do the job for you. If you are into analog only and unwilling to digitize your turntable it is probably best to avoid the subwoofer altogether. Doing a swarm system would be the best way to go with an analog system.