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  1. #1

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    Default How does SDA 1A stack up against 1B?

    It looks like the sda imaging would be better with the side by side tweeters yet I have seen some members say you want the vertically oriented tweeters. I'm looking at purchasing one or the other. I can get either for about 700 shipped to me. If anyone knows of a better deal out there let me know.

  2. #2

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    The side-by-side tweeters are an older generation of SDA evolution. The SDA tweeter was dropped in favor of one or more non-SDA tweeters; if more than one the additional tweeters are frequency-limited to provide a progressive point-source.

    Some folks are so annoyed by the SDA tweeter that they unplug it, rendering it silent.

    1. Go for the latest-generation SDA that you can find/afford.

    2. $700 seems high for 1A/1B; I assume that shipping cost is approximately 50% of the total--or--they've been COMPETENTLY upgraded with fresh crossover parts and other mods/updates.

  3. #3

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    Default Are you telling me the 1Bs don't actually use SDA on the tweeter?

    If the 1bs don't use SDA on the tweeter thats a pretty big difference in the speakers. I would love to hear the two. I think I would love the directional sound from the tweeter as well. I remember the first polks I listened to in the 80's. 4 horizontal tweets and about 6 or 8 drivers. Sounded like one was in my left ear and the other in my right ear.

  4. #4

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    I'm looking at the manuals and can't acually find a model with 4 horizontal tweets. Thats the way I remember it, of course that was at a consumer electronics show over 25 years ago.

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    Quote Originally Posted by Middle Age View Post
    I think I would love the directional sound from the tweeter as well. I remember the first polks I listened to in the 80's. 4 horizontal tweets and about 6 or 8 drivers. Sounded like one was in my left ear and the other in my right ear.
    They sound phasey and disconnected and very unnatural at times because there is too much dimensional information. Do yourself a favor and forget about the early SDA's. If it was so wonderful they never would have tweaked them to discontinue the use of the dimensional tweeter. The progressive point source is a better more natural configuration.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  6. #6

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    Quote Originally Posted by Middle Age View Post
    I'm looking at the manuals and can't acually find a model with 4 horizontal tweets. Thats the way I remember it, of course that was at a consumer electronics show over 25 years ago.
    SDA SRS
    SDA SRS 1.2
    SDA SRS 2.3
    SDA SRS 1.2TL
    SDA SRS 2.3TL

    All are atleast 2 generations away from the side by side type SDA's, with the "TL" series being the best and last of the SDA's before they stopped making them.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  7. #7

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    ^What he said^
    '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 turd by the clean end."

  8. #8

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    Thanks everyone, I'm starting to get a feel for the ones that would satisfy my SDA craving, compact, 1c, 3.1tl in that order. I dusted off my old Hafler DH-500 last night and I think it will have enough power though I'm not sure about the common ground. Time to do more research.

  9. #9

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    This thread is so d?j? vu of a thread about a year or so ago...



    Good luck!!

  10. #10

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    Quote Originally Posted by heiney9 View Post
    Do yourself a favor and forget about the early SDA's. If it was so wonderful they never would have tweaked them to discontinue the use of the dimensional tweeter.
    H9
    Awww damn, wish I hadn't read that. Now I am worried a bit. lol
    --Gary--

  11. #11

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    Quote Originally Posted by Middle Age View Post
    It looks like the sda imaging would be better with the side by side tweeters yet I have seen some members say you want the vertically oriented tweeters. I'm looking at purchasing one or the other. I can get either for about 700 shipped to me. If anyone knows of a better deal out there let me know.
    Those prices are way high. I personally would stay away from the 1A's because of the tweeter architecture, but if you can get the 1B's cheaply enough (let's say $200-250ish) don't rule them out. A little known secret is the 1B (and nearly identical SDA SRS 2) crossover can be modded to drive RDO198-1's by simply replacing the 4.4 uf cap with a 5.8uf.

    The low pass caps are big (and expensive) because of the 4-ohm MW6509 midwoofers, but modded this way the 1B is a sleeper.
    VTL ST50 w/mods/RCA6L6GC/TlfnknECC801S
    CJPV-5 w/mods
    TT CJ Sonographe SG3 Oak/Sumiko LMT/Grado Wood Plat/Sumiko PIB2/The Clamp
    Musical Fidelity A1 CDPro
    Tuners w/mods Kenwood KT5020/Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9/Vibrapods/MIT Shtgn AC1 IEC's/MIT Shotgun 2 IC's/MIT Shtgn 2 Speaker
    PSAudio Cryo PwrPrt Prem/ExctPwrEP15A
    Wlnt SDA 2B TL/Oak SDA SRS II TL-Sonicaps/Mills/Cardas/Cust SDA ICs/Mortite/Dynamat Extreme/TFLF Rings/FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels

  12. #12

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    Quote Originally Posted by inspiredsports View Post
    The low pass caps are big (and expensive) because of the 4-ohm MW6509 midwoofers, but modded this way the 1B is a sleeper.
    Not THAT expensive, ERSE sells a set of four 91uF (to make two pair of 182uF assemblies, one for each speaker) for $91. Those went into my 1Bs. VERY satisfied.

    Of course, you can spend a whole lot more if you choose...




  13. #13

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    Quote Originally Posted by Schurkey View Post
    Not THAT expensive, ERSE sells a set of four 91uF (to make two pair of 182uF assemblies, one for each speaker) for $91. Those went into my 1Bs. VERY satisfied.

    Of course, you can spend a whole lot more if you choose...
    I meant by comparison to the one 20 uf/one 40 uf low pass architecture per cabinet with the newer MW6510/MW6503 and MW6511 equipped models. So newer models you are paying to upgrade a total of 60 uf

    By comparison, the 1B (and 1986 SDA SRS 2) low pass uses two 34 uf, 1 55 uf and one 130 uf, so you are paying SIGNIFICANTLY more to upgrade 253uf of capacitance, over 400% more.

    And yes, you are correct it is better to use 2 equal caps to get the 130 + 55 section covered. Don't get me wrong, modded 1B's, especially if you go with 198's, will run with the best.

    From a modding standpoint (even if the 2 tweeter design sounded good and IMHO it doesn't) The 1A is an even worse proposition with something like 400uf of capacitance on the low pass board.
    Last edited by inspiredsports; 01-15-2012 at 11:56 PM.
    VTL ST50 w/mods/RCA6L6GC/TlfnknECC801S
    CJPV-5 w/mods
    TT CJ Sonographe SG3 Oak/Sumiko LMT/Grado Wood Plat/Sumiko PIB2/The Clamp
    Musical Fidelity A1 CDPro
    Tuners w/mods Kenwood KT5020/Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9/Vibrapods/MIT Shtgn AC1 IEC's/MIT Shotgun 2 IC's/MIT Shtgn 2 Speaker
    PSAudio Cryo PwrPrt Prem/ExctPwrEP15A
    Wlnt SDA 2B TL/Oak SDA SRS II TL-Sonicaps/Mills/Cardas/Cust SDA ICs/Mortite/Dynamat Extreme/TFLF Rings/FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels

  14. #14

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    Quote Originally Posted by heiney9 View Post
    SDA SRS
    SDA SRS 1.2
    SDA SRS 2.3
    SDA SRS 1.2TL
    SDA SRS 2.3TL

    All are atleast 2 generations away from the side by side type SDA's, with the "TL" series being the best and last of the SDA's before they stopped making them.
    Don't forget about the 3.1TL's. Lowly on the SDA SRS list? Yes, but they still put out some great audio.

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

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