Subwoofers are a superlative room treatment


Several months ago I posted about how KT 170 tubes improved my overall sound and in particular improved the boomy bass I was experiencing with KT 150 tubes.  During the discussion @Mijostyn suggested that my Swarm subwoofer system was likely inadequate for my S7 Magico speakers which each have 3 10" woofers and adding more subs would make a big improvement in my sound.    The swarm has 4 10" passive speaker cones.  @Mulveling opined that I likely had more than enough bass with the S7s alone.  I had spoken with Mike at Suncoast Audio who also brought up adding more subs to the system.  My low end was much better with the new tubes and it seemed counterintuitive to add more subs to tame the sound, but Mike has never been wrong regarding my system.  So I took the plunge.  He recommended 4 B&W DB1B subs with 2 active 12" drivers with DSP.  I bought two and he let me test drive an additional two.  These subs are staggered in the room, similar to a Geddes set up, but none are behind the listening position.  I wasn't really sure how my sound would end up and was actually a little nervous that the bass would overwhelm the overall sonic presentation.  My fears were unfounded.  The bass was definitely better than before-more focused and rich.  But the big surprise was that the overall sound was vastly improved.  The sound stage expanded with more air between instruments.  The tone improved as well.  My wife (with hearing aids) and daughter who are very familiar with the system each said the same thing within 10 seconds of listening.  "It sounds so clear".  This "upgrade" has had by far the largest impact on sound in my system-more so than upgrading to the VAC Master Preamp.  So reflecting on why it is so much better than my previous sub array- its clear there must be a ratio of subwoofer square area and woofer square area that is optimum.  Or the DSP aspect set to the listening spot for each sub, or a combo of the two.  @mijostyn had alluded to the ratio in my last post as being important.  The set up is straight forward and there is no connection with the speaker crossovers.  The crossover on the subs was set to 70.  I post this so others may be encouraged to consider a similar approach.  These subs improved the low end, but the most impressive aspect is that they act like a whole room sonic filter of the highest order-without altering the sound from the mains.  Incredible. My room has had acoustic treatments consisting of corner bass traps with diffusion, first reflective point dispersion/absorption, quadratic diffusers, ceiling absorption and HFT's that have been in place for years.  The subs are king of them all. 

orthomead

@orthomead

No offence intended, but your fairly long OP would have been much easier to read and understand, if you’d broken it up into meaningful paragraphs. You’ve made it hard for the reader to follow your arguments.

congrats you are happy ! are the new subs servo controlled subs ? and what size are they ?
i think there are a # of YT videos extolling the value of multiple subs and i think it is a no brainer now proven they work
are those vented or sealed ? some advocate using bOTH!
I am going to try open baffle servo subs 12 "
some chaps elsewhere were debating "fast bass:" which ( to me just means it is controlled better like w/ servo subs and i am quite sure the servo subs are MUCH better than they used to be) older ones had reliability issues

funny why is it all the old guys think speaker tech just STOPPED! like 20 years ago and new speakers and subs are not better ? ? are they just lazy to keep up ? so just dismissive ?
reminds me of some of the old profs at university who just were resting on their laurels and had not done any noteworthy research in years ! we always wondered if their brains had atrophied ?
when i watch the good , honest reviewers on YT like new record day , audioholics etc they sure seem to be saying the newer are better and say so! even prove it w/ measurements ! ( and YES they are LISTENING too! -love it when some curmudgeon intones whining "but do they LISTEN " to them LOL 

Although well down scale from your system, I added two Rythmik F12 Subs to my Fyne Audio F-702s--driven by a Rogue RP-7 preamp and Odyssey Kismet monoblocs, and the improvement in sound quality seems to extend far beyond the lower bass realm.  Similar to your experience, the tonal quality, sound stage, and imaging all seemed to improve by a significant margin.  Even my wife, who is not as "into" audio as much as I am immediately noticed a significant difference.  No swarm of subs for us, however, as our room is not large enough.  We ae quite pleased with the realism we are achieving with the system.

I'm Jealous, but happy for you. I'm running B&W 702 S2's with a pair of B&W DB4s subs. Yours are their flagship with the  dual 12" drivers and 2,000w to drive them. I was thinking of getting one of your DB1D's instead of the dual DB4s's, but liked the ability to pair one with each channel/monoblock. Don't get me wrong, the DB4s is really nice, I might move to 4 of them if it's worth it. Right now focused on building a new room for the system.

Quickjack, you’re not so quick. The OP clearly states what woofers he’s now using. From that information you can answer all your own questions. And, apart from the rise of open baffle designs and a few other ideas, I’d say there really is not much that is really new under the subwoofer sun. The Swarm has been around for at least 25 years, for example. Plate amps are better, for sure.