List of Acoustic Suspension Monitor Speakers

F1nutF1nut Posts: 39,778
I'm interested in compiling a list for reference, so please post the maker and model of any current or recent offerings. Price is irrelevant.
Political Correctness'.........defined

"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


Comments

  • mhardy6647mhardy6647 Posts: 17,950
    edited October 2017
    Not to be persnickety, but are you interested in truly "acoustic suspension" alignments or any and all sealed boxes?

    I am thinking,e.g., of the BBC LS3/5A nearfield monitor specification, which is a small sealed box but not (???) strictly speaking acoustic suspension.

    All this being said, the modern-day LS3/5A clonies are the only sealed box loudspeakers that leap to mind. :|

    8opzzsg6a0yw.png

    Heck, even KEF's modern "visualization" of the LS3/5A -- the LS50 -- is ported.
    Go figure.
    https://www.stereophile.com/content/kef-ls50-anniversary-model-loudspeaker

    kcpoun9drqdp.png


    So -- this should be an interesting list; good question! :)

    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • mhardy6647mhardy6647 Posts: 17,950
    Good ol' teh interwebs turned up this, albeit from 2006-7:
    http://forums.stevehoffman.tv/threads/who-today-makes-sealed-box-speakers.81619/
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • F1nutF1nut Posts: 39,778
    Sealed design examples are welcome too.

    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


  • F1nutF1nut Posts: 39,778
    A few for the list.

    NHT C3
    DC10 Audio Berlin R
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


  • codycatalistcodycatalist Posts: 1,391
    edited October 2017
    Didn't read post all the way through. Corrected my post.
    Living room

    Mains: Paradigm 90P
    Lows: Velodyne CHT12, Pioneer SW-8Mk2
    Power: Marantz SR7000
    Tv: Samsung UHD 55' Curved 4k

    2 Channel Den

    Mains: SDA2B Upgraded XOs and Binding Posts
    Pre: Denon PRA-1200
    Power: Yamaha AV34
    TT: Pioneer PL510
    Tv: Samsung UHD 55' 4K

    Noggin Rockin'

    Phillips L2
    Grado SE80
    Harman Kardon CL
    Little dot 1+/GE JAN 5654w

    Closet of Dreams:

    Harman Kardon AVR130
    Yamaha HTR5590
    Polk RTA11TL
    Polk TSI200s
    New Large Advents 25th Anniversary Edition
    Bravo V2/RCA Clear top Conn branded 12AU7

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
  • OleBootOleBoot Posts: 274
    I think all ATC speakers are sealed box.
    I started out with nothing and have most of it left.
  • rooftop59rooftop59 Posts: 4,278
    Please explain sealed vs acoustic suspension.

    And not passive radiator designs, right (which I know is a kind of port)?
    HT Rig:
    Denon AVR-X4200w; Parasound HCA-1205A; Arcam rDac; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Def Tech Procenter 1000; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; Sony BDP-S390, FireTV gen 2

    Master Bedroom
    Marantz SR-5007; Audiosource Amp Two, PSB Imagine Mini, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, FireTV, Arcam rDac; Bryson BPD-1
  • mhardy6647mhardy6647 Posts: 17,950
    edited November 2017
    I haven't heard the LS50s (perhaps I am the only 'audiophile' who hasn't?), so I cannot say.
    rooftop59 wrote: »
    Please explain sealed vs acoustic suspension.

    And not passive radiator designs, right (which I know is a kind of port)?

    Without actually knowing the answer, I believe that the Villchur/Acoustic Research acoustic suspension alignment represents a way to get low bass from a small box and a woofer with a highly compliant suspension, using the air in the box as a 'spring' for the restorative force -- as opposed to a "springy" surround, like the accordion-pleated paper or treated paper surrounds common in the 1950s on consumer woofers, and still found on many 'sound reinforcement' drivers.

    Having said this, I suspect there are precise definitions of the "space" that constitutes acoustic suspension loading (i.e., combination of box parameters & driver T/S parameters) -- but I am naive of them & too lazy to look 'em up! :neutral: It might be instructive to look at Villchur's early patents, but then again the Thiele/Small model didn't exist at that point, so it might be hard to translate Villchur's approach to a modern point of view informed by the work of Thiele, Small & others in the intervening decades.

    Nice Villchur overview from the AES:
    http://www.aes.org/aeshc/docs/recording.technology.history/villchur.html

    As to "other" sealed box alignments (and these are only my opinions; I am no expert!):

    Even in the early days of hifi, very large sealed boxes were used with the then-common low-compliance woofers to get (fairly) deep bass (with high sensitivity). This alignment was/is known as the infinite baffle. Electrovoice, for example, in their speaker driver technical documents, often recommended installing their big drivers in a conveniently located closet to serve as an infinite baffle :) -- although they noted that the availablity of two appropriately located closets for stereo was often not available in the hifi enthusiast's home ;) The woofers used in the classic infinite baffles had their own springy suspension (accordion pleat surrounds), of course -- they're the same woofers used in ported (vented) enclosures in those somewhat naive times ;)

    There are also (very) small sealed boxes that probably don't meet the formal definition (assuming there is one!) of acoustic suspension. The more I think about the resonant, "lossy" boxes of the LS3/5A monitor specification, the more I figure they're not really "sealed" in the sense of F1nut's request... although I may be treading on the slippery slope of semantics here.

    :blush:
    Post edited by mhardy6647 on
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • mhardy6647mhardy6647 Posts: 17,950
    rooftop59 wrote: »
    Please explain sealed vs acoustic suspension.

    And not passive radiator designs, right (which I know is a kind of port)?

    Right. Passive radiators are a special case of the Helmholtz resonator/"bass reflex" ported enclosure design. The mass of the PR takes the place of the mass of air in a Helmholtz "port" in loading the woofer at low frequencies. Note that either approach results in a deliberately resonant enclosure for the woofer. This serves to augment low frequency output at certain frequencies, but does not load the woofer as well (at really low frequencies) as would a sealed enclosure. At least, that's the way I remember it :/

    vsh8ws4duebx.png

    All things being equal (I think!), the rate of bass output roll-off of a PR loaded woofer is faster (steeper as a function of frequency) than an bass reflex loaded woofer. Either alignment gives steeper bass roll-off than an acoustic suspension alignment.

    Is this at all helpful? ::p


    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • Yep2Yep2 Posts: 1,124
    edited November 2017
    NHT M6's.
    Totally sealed.
    Stereophile "Class A".
    3p9gazxwgq8s.jpg
  • rooftop59rooftop59 Posts: 4,278
    Yep2 wrote: »
    NHT M6's.
    Totally sealed.
    Stereophile "Class A".
    3p9gazxwgq8s.jpg

    Well those are LONG out of production, but the last time i checked they were doing a a small run of a special edition...
    HT Rig:
    Denon AVR-X4200w; Parasound HCA-1205A; Arcam rDac; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Def Tech Procenter 1000; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; Sony BDP-S390, FireTV gen 2

    Master Bedroom
    Marantz SR-5007; Audiosource Amp Two, PSB Imagine Mini, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, FireTV, Arcam rDac; Bryson BPD-1
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!