1st generation SDA-II's

ardvark1
ardvark1 Posts: 30
edited January 2005 in Vintage Speakers
Hello everyone, I'm new to the forum and think it's great.

I have a pair of SDA-II speakers made in 9/83 that I purchased in 84. They have the SL1000 tweeters which I am currently upgrading to the RD0194-1's.
I have been driving this pair all these years with a Hafler DH-500.

Questons;
Does anyone in the forum own/owned this early model?
If so, anyone done any crossover upgrade work?
Anyone have a schematic?

Thanks in advance
Post edited by ardvark1 on
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Comments

  • F1nut
    F1nut Posts: 50,592
    edited January 2005
    Ardvark,

    Welcome to the forum. Mayo......near Annapolis, right?

    I'm not aware of any forum members upgrading that crossover, maybe you can be the first. If you contact Ken Swauger at Polk he will send you a schematic.

    F1
    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."

    President of Club Polk

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  • ardvark1
    ardvark1 Posts: 30
    edited January 2005
    Thanks F1,

    I'll give Ken a call on Monday.

    Your right, about 12 miles south, on the bay.

    Ard
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  • BlueMDPicker
    BlueMDPicker Posts: 7,569
    edited January 2005
    Welcome to the forum!
    I've got a copy of the SDA II crossover schematic, dated 11/26/84, with two revisions:

    3.5 ohm resistor changed to 4 ohm on both boards and fuse replaced by polyswitch on both boards. Here are the upgradable parts (per cabinet):

    Resistors

    2 - 4.0 ohm 5 watt
    2 - 2.7 ohm 5 watt

    Capacitors

    3 - 750 pF silver mica
    1 - 0.5 uF mylar
    2 - 12 uF mylar
    2 - 27 uF electrolytic

    Polyswitch

    2 - RDE030A
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  • F1nut
    F1nut Posts: 50,592
    edited January 2005
    Originally posted by ardvark1

    Your right, about 12 miles south, on the bay.


    You're welcome. Thought so, been a long time since I've been there. Mayo beach or some such, it was nice.
    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."

    President of Club Polk

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  • LVB
    LVB Posts: 7
    edited January 2005
    I have this model with the sl2000 tweeters and the sound is very addictive. I have considerd cap upgrades but Polk got it pretty much right as mylar and silver mica caps don't degrade much over time. There are two electrolytic caps in the system but the are parallel(sp) and not in series with the mid-bass drivers and have less of an effect on sound quality. If you go for the upgrades
    please report back and tell us how it worked out.

    System
    SDA II
    Adcom gfp 750 preamp
    Mccormack DNA-1 power amp
    Sony scd-c333es cd player
    Sony ja555es mini disc player
    Pioneer Elite PD-75 cd player
    and too much other gear to list
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited January 2005
    Shouldn't that be aardvark1??? Welcome to the Club...

    Interesting post since there no record I can find of the SDA 2 using the SL1000, although its contemporary, the SDA 1, is shown to have used the 1000.
    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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  • BlueMDPicker
    BlueMDPicker Posts: 7,569
    edited January 2005
    Originally posted by Tour2ma
    Interesting post since there no record I can find of the SDA 2 using the SL1000, although its contemporary, the SDA 1, is shown to have used the 1000.

    Just give me weed, whites and wine
    And I'll build a speaker line
    That'll keep ya' guessin'
    'Bout all our messin'
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited January 2005
    LOL... yup, the good old days of Polk production when all the speakers had a certain, distintive odor...

    One side note... comment has been made about the SDA tweeter, dropped from all subsequent models, and it's "spacey" image impact. I wonder if it can simply be disconnected....
    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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  • ardvark1
    ardvark1 Posts: 30
    edited January 2005
    I spell aardvark with one "A" because of the huge number of people that use it.
    Now I am lumped in with the people who can't spell kerectly.

    jeez.:D

    I still have the original manual. I'll post the cover and the spec's.
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  • dorokusai
    dorokusai Posts: 25,577
    edited January 2005
    Originally posted by Tour2ma
    LOL... yup, the good old days of Polk production when all the speakers had a certain, distintive odor...

    One side note... comment has been made about the SDA tweeter, dropped from all subsequent models, and it's "spacey" image impact. I wonder if it can simply be disconnected....

    Yes, it can be disconnected.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • ardvark1
    ardvark1 Posts: 30
    edited January 2005
    Wow, sorry about that, forgot to resize the image.
    Here are the spec's from the manual.
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