Choosing Sub-woofers. Please advise ASAP.

Tim, I agree with you on using multiple subs.  The problem becomes that in order to do it, you MUST place them in exactly the correct positions. If you don't, you lose everything you are trying to accomplish. It also is very costly when you start using top quality subs. You can't get better sound using multiple subs if the subs you are using aren't the same quality as two great subs.  Can't fix what's wrong by just adding more of the same (not talking about anyone's subs specifically).  

In discussing this with a designer, you need a dedicated room typically to make this realistic.  There is no affordable way to do multiple subs when you are talking about high end systems.  You also need to keep in mind what main speakers you are augmenting when using subs.  So many folks don't realize this.  I think that's why I posted what I did. Again, i'm sure your subs are outstanding, but 95% of us can't put 4 or more subs in our rooms, especially where they must be placed.  I've heard arrayed subs in show rooms in the past and loved what I heard. I specifically remember hearing them about 10 years ago in NYC at a high end store, but I hated the mains they ran them with, but it cleaned up the bass a great deal.  

Yes, I like how Vandersteen runs his subs by taking the signal from the mains the way he does and crossing over where he does do the sound of the bass is consistent with the sound of the main speakers. I also like the idea of having a semi active speaker like the Quatro on up.  If done properly, it also will relieve the main amp from having to run anything from 100 or so down and that helps the amps sound better as they aren't having to deal with the bass load which is very difficult for any amp.  Lot's more dynamics current available for the mids which folks don't realize is where a ton is needed on transients.

ctsooner,

     
     As you heard at that high end store in NYC, distributed bass array systems work incredibly well.  They provide excellent bass response that is capable of being taut, textured, detailed and nuanced while also capable of going deep and powerful when the content calls for it.  Because of this, how they integrate so well with any quality or type of main speakers and work in any room no matter the size or shape, I consider them an extremely good bass reproduction system.  

       However, DBAs are not perfect.  A minimum of 4 subs are required to achieve this great bass response throughout the entire room.  Individuals must also make a few decisions before deciding to deploy a DBA in their room:

1.  Do they want great bass response throughout the entire room or just at one optimized listening position?

    The use of 1 or 2 good quality subs can be utilized, if positioned properly, to achieve very good bass response at a single listening position in a room typically called a 'sweet spot'.  The compromise of this approach is that bass response will not be good at numerous other locations in their room due to bass standing waves at those locations. The bass will sound exaggerated, under-emphasized or even nonexistent at these locations.
      The use of 4 or more subs in a DBA is the only currently known method that has been empirically proven to achieve very good bass response throughout an entire room.  
     The choice and ramifications are clear, either you find a way to accommodate the extra subs or you settle for very good bass response at a single sweet spot.

2.  Do they want a very good complete DBA system (like the $3K Swarm or Debra) or do they want to create their own custom DBA  (using 4 even higher quality subs of their own choosing that will be considerably more expensive)?

     I know of only one person, another Audiogon member enginedr1960, who created his own DBA using 4 Rel q201e subs.  He says it's working very well but I haven't heard it and he has never heard the Swarm or Debra DBA.

     I'm completely satisfied with my Debra DBA for both 2-ch music and HT.  However, I would think substituting other high quality subs in a custom DBA would likely sound as good or even possibly better.  Verrsatility is just another of the many benefits of the DBA approach.

     Yes, I am biased but only because I know it works so well.

     Tim  

there really is no difference in this than there is for setting up speakers properly.  It's all about perfect set up and using the best quality subs you can.  The problem is that some folks will read what you post about how great it is and then assume they can use any sub and get great sound. This isn't how it works.  You can not get an inferior sub to sound better than a great one because of this set up.  You still need great sounding subs that can be set up like this.  

I think it's awesome that you love your sub set up.  I haven't hear the subs, but if you are getting 4 sub 1000 subs for 3k, I have to wonder if they will sound better than a pair of 1500 ea subs that are better quality (not all 1500 subs will be better quality, just making a blanket statement).  My other point is that most folks I know well could never have 4 or more subs regardless of size (and size does matter big time) in their rooms.  Life factors intervene as I posted above. Not debating the quality, just the cost, difficulty to set up perfectly and the ability to fit that many in their listening area (logistics).  That's all.  Not debating at all.  

ctsooner,

     I forgot to respond to the last part of your post where you stated:

" Yes, I like how Vandersteen runs his subs by taking the signal from the mains the way he does and crossing over where he does do the sound of the bass is consistent with the sound of the main speakers. I also like the idea of having a semi active speaker like the Quatro on up.  If done properly, it also will relieve the main amp from having to run anything from 100 or so down and that helps the amps sound better as they aren't having to deal with the bass load which is very difficult for any amp.  Lot's more dynamics current available for the mids which folks don't realize is where a ton is needed on transients."

     I don't disagree with anything you said.  I think your point about reducing the main amp's bass duties so they can sound better and have better dynamic range is important.
      I've never actually heard the Vandersteen Quatros but, from the pro reviews I've read and from your comments, I consider them very high quality speakers.  I'm glad you're enjoying them and I have no desire to convince you of anything except the benefits of a good DBA.  
     In fact, with a powered sub already existing in your room inside each Quatro,  perhaps you would only need 2 more subs to reach the required 4 sub minimum for a DBA in your room. A pair of carefully positioned Vandersteen WQs,  combined with the pair of subs in your Quatros, may result in a very high quality DBA in your room.

     I chose a somewhat different approach in my room.  I read some information from acoustical engineers that suggested, for best reproduction of the entire audible frequency range, any system should be constructed based on how various sound wave frequencies will interact with the room.  They explained how bass sound waves interact and propagate within any given room very differently from how mid-range and treble frequencies do so.  Basically, the lower the frequency the longer the sound wave produced. All sound waves are going to be reflected by room boundaries (walls, ceilings and floors).

     The only known and proven method for significantly reducing bass standing waves caused by the very long bass frequency sound waves reflecting off room boundaries and crashing into each other is the use of 4 or more bass sources (subs) in a DBA system.  This will provide very good bass response throughout the entire room.
      Unfortunately, the much shorter mid-range and treble frequency sound waves also bounce off room boundaries and cause standing waves.  But there's currently no known method for significantly reducing mid-range and treble standing waves so that very good mid-range and treble frequency response can be achieved throughout the entire room.  
     The only currently known solution is to optimize mid-range and treble response at a single listening position or sweet spot.  This is done via speaker positioning and angling as well as room treatments (absorbing and diffusing  panels) at critical reflection points.  The goal being that direct mid-range and treble sound waves launched from the speakers arrive at the chosen sweet spot location before (even milliseconds before) the reflected sound waves arrive.

      Because of the above, these acoustic engineers advise constructing a system from the bottom up.  First get the bass foundation right by installing a DBA consisting of at least 4 subs.  Then get the remainder of the frequency range right by installing your speakers of choice and optimizing their positioning and angling and room treatment for a given listening position 'sweet spot'.
     
     I followed this advice, installing the Debra's 4 subs for optimized bass response first and then positioning my Magnepan 2.7qr panels for optimum mid-range and treble response at my listening position.

     This works very well in my room and your method seems to be working very well in your room.

     We both did well!  
     More than 1 way to skin a cat, right?

  Tim   

Hi ctsooner,

You stated: 
" I think it's awesome that you love your sub set up.  I haven't hear the subs, but if you are getting 4 sub 1000 subs for 3k, I have to wonder if they will sound better than a pair of 1500 ea subs that are better quality (not all 1500 subs will be better quality, just making a blanket statement).  My other point is that most folks I know well could never have 4 or more subs regardless of size (and size does matter big time) in their rooms.  Life factors intervene as I posted above. Not debating the quality, just the cost, difficulty to set up perfectly and the ability to fit that many in their listening area (logistics).  That's all.  Not debating at all. "

     It is true that the Swarm and Debra DBA systems are reasonably priced at $3,000.  You get four small (1ft x 2ft x 2ft) but substantial (67 lb)  bass reflex  4 ohm subs with spiked footers and 10" drivers along with a 1,000 watt class A/B sub amp.  I consider these systems bargains given their price and performance.

     In my experience and room, the Debra system clearly provided better bass than my former 2 good quality older Kinergistics 12" subs were capable of.  My opinion is that either the Swarm or Debra four sub systems are likely to provide better bass in most rooms than the use  of  just a pair of subs no matter the price or quality.  I have not actually compared my Debra system to a pair of very high quality subs but would seriously doubt a pair would sound as good unless they were positioned to optimize bass at just a single sweet spot.

     Would the Swarm and Debra's bass performance  be improved upon through the use of 4 even higher quality subs  in the $1,500 plus price range?  Yes, I think this would further improve the bass performance of a DBA commensurate with the performance level increase of the substituted subs.

     I'm very curious how using 4 very high quality subs would sound in my room but I'm in no hurry to spend the thousands of dollars necessary to find out.  I'm currently very satisfied with the Debra's bass performance in my system with the supplied subs.  My concern with spending more in an effort for further improvement is the always present 'law of diminishing returns' in this hobby.  My opinion is that improvements would not be dramatic but marginal in nature and likely be hard to justify given the large expense.

     As to the point about most people not being able to have, or be allowed to have, 4 subs in their room, I consider this the most likely reason for the reluctance of many people to even try a DBA.

      I understand this concern all too well.  My wife thought I was nuts and we both thought we'd have to rearrange our living room to accommodate these 4 subs even though they're relatively small.  But I'm somewhat devoted to the performance of my combination music and audio/video system so I was persistent and managed to convince her to let me give it a try.
     Fortunately, I was able to position each sub where it sounded best while keeping their physical presence disguised (the front 2 hidden behind each of my 6' x 2' panel main speakers and the rear 2 partially hidden, 1 behind a leather chair and the other behind a large end table).

     Of course, not everyone will be able to locate 4 subs in their room as discreetly.  If this is the case,  each individual must determine how important very good bass response throughout their entire room is to them.  Those who think it's important will find a way to accommodate 4 subs.  Those who don't will need to use 2 or less good subs and settle for good bass at only a chosen single sweet spot.

Tim