why are sda drivers as large as the mid bass drivers?

sda2mike
sda2mike Posts: 3,131
edited November 2005 in Vintage Speakers
i have sda2b's and was pondering the above. when i do the balance control test, the sda signal is much quiter than the rest.
Post edited by sda2mike on
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited November 2005
    Because the tweeters are only working with the stereo side. They are the same with tweeters disconnected.
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  • sda2mike
    sda2mike Posts: 3,131
    edited November 2005
    so...the sda drivers handle higher frequencies as well?
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  • thehaens@cox.net
    thehaens@cox.net Posts: 1,012
    edited November 2005
    There has been many threads posted on this question. I have a pair of 1A's and it is less audible on the checks on the Dimensional drivers when doing the balance test, and from what I can tell on the schematic, they have two dimensional drivers and one dimensional tweeter, and two stereo drivers and 1 stereo tweet.

    scott
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  • sda2mike
    sda2mike Posts: 3,131
    edited November 2005
    the 2b's have 1 tweeter
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited November 2005
    sda2mike wrote:
    so...the sda drivers handle higher frequencies as well?
    Nope... It's not necessary to cancel interaural crosstalk in the upper frequencies. 1st generation SDA's (1's, 2's and CRS's) had SDA tweeters, but they were dropped from subsequent models.

    As for the original question, I've always attributed the reduced apparent spl of the SDA MW's to the cancelation that's occurring.
    More later,
    Tour...
    Vox Copuli
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited November 2005
    And on the relative size questions... while the stereo and SDA MW's are the same size, they are often not the same part number. And to add to the confusion some SDA models have fewer SDA MW's, e.g, the 2.3's and 3.1.
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • nadams
    nadams Posts: 5,877
    edited November 2005
    Tour- the SDA2's (originals) also have an uneven number, two stereo drivers to one SDA driver. As far as I know, they used the same part number on all of them in that speaker.
    Ludicrous gibs!
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  • fenderlady
    fenderlady Posts: 24
    edited November 2005
    That is my take on the drivers on the SDA-2 speakers. They used ALL the same drivers.

    Kristi
    Pioneer Elite 24 receiver, Rotel 1095B 5 channel amp, Sony BDP-300 Blu-Ray, Marantz laserdisk, Polk SDA2, Csi5. Samsung HLT6178 DLP.
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited November 2005
    Yup... the original 2's used 3 MW6501's.
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • F1nut
    F1nut Posts: 50,726
    edited November 2005
    why are sda drivers as large as the mid bass drivers?

    They have to be the same size for the interaural crosstalk cancelation to work properly.
    Political Correctness'.........defined

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  • Tour2ma
    Tour2ma Posts: 10,177
    edited November 2005
    Jesse,
    I'm guessing that choice is response characteristic driven, i.e., FR and cone dynamics, rather than radiating area. Makes me wonder why different drivers were used in combination in the last generations... :confused:
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • TAB
    TAB Posts: 41
    edited November 2005
    Since the thread is going this direction, can anyone tell me what the differences are in the MW65XX series drivers? They seem to all have about the same appearance to me. Thanks!
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  • F1nut
    F1nut Posts: 50,726
    edited November 2005
    Different drivers, different Q's. However, the drivers still need to have the same radiating area.
    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."

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  • ohskigod
    ohskigod Posts: 6,502
    edited November 2005
    F1nut wrote:
    They have to be the same size for the interaural crosstalk cancelation to work properly.


    that makes sence, if your cancelling out crosstalk from any size driver, best candidate would be a driver of same size and close specs. even if that wasnt the case, I think it would cost more money to design a smaller driver to do the same job. I.E. just make more of what you got
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