List of Acoustic Suspension Monitor Speakers

F1nutF1nut Posts: 40,379
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: 19,034
    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! :)

  • mhardy6647mhardy6647 Posts: 19,034
    Good ol' teh interwebs turned up this, albeit from 2006-7:
    http://forums.stevehoffman.tv/threads/who-today-makes-sealed-box-speakers.81619/
  • F1nutF1nut Posts: 40,379
    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: 40,379
    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: 1,621
    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: Adcom GFA-545
    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
    Yamaha AV-34

    "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
    "Those that don't know, don't know that they don't know." - heiney9
  • OleBootOleBoot Posts: 310
    I think all ATC speakers are sealed box.
    I started out with nothing and have most of it left.
  • rooftop59rooftop59 Posts: 4,603
    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; Peachtree Audio Nova Integrated; Bryson BPD-1; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; LG UP870 4K BDP

    Master Bedroom
    Marantz SR-5007; Peachtree Audio NovaPre; Audiosource Amp Two, PSB Imagine B, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, Squeezebox Touch
  • mhardy6647mhardy6647 Posts: 19,034
    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
  • mhardy6647mhardy6647 Posts: 19,034
    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


  • rooftop59rooftop59 Posts: 4,603
    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; Peachtree Audio Nova Integrated; Bryson BPD-1; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; LG UP870 4K BDP

    Master Bedroom
    Marantz SR-5007; Peachtree Audio NovaPre; Audiosource Amp Two, PSB Imagine B, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, Squeezebox Touch
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!