"TL" upgrade for SDA 1A?

g-man
g-man Posts: 46
edited March 2009 in Vintage Speakers
Hi all.

It's been allmost three years since I were in this forum.
I have moved to a new appartement and now I have hooked the SDA 1a's up again and I still love these babies!..:)

I have listen to them with a wide variaty of music lately and I've noticed a "sound/noise" in the upper mid/lower high area.It sounds horrible,like it's blown in some odd way.Doesn't matter if it's loud or not,but it gets worse the higher the volume.

I've read a few TL conversions posts,but they're all about the 2B's.

I have the SL2000 "silver coil" tweeters,and if I have to change them out I just might go for a better solution to make them even better.

So,if the TL conversion is possible,how much am i looking at?

Tweeters,capacitors,resistors,? and if,God forbids,the midrange driver is bad, how much are they?

And final question,is the 1A's 4,6 or 8 ohms?

Thank you for replies.
Stereo:
Speakers:Polk SDA-1A
cd/dvd:Marantz DV6200(HDCD)
Amp: DUAL Audiophile Concept. (1992)

ICE:
Alpine CDA9887R
Audison LRX 1.1K
Audison LRX 4.5
Amega Q-Comp50
Amega Q-Comp60
Sub: Focal Utopia WX21 BE
Sub:? maybe 3 MM840.
Stinger HPI signal,power,speaker cables
Post edited by g-man on
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Comments

  • F1nut
    F1nut Posts: 50,746
    edited March 2009
    Welcome back g-man.

    There's no easy way to change the HF section of your crossover to accommodate the TL upgrade. What I would suggest is to upgrade your SL2000 tweeters to the silk dome RD0194-1 as they will present a smoother sound.

    Crossover upgrades will also result in an improved sound, but the cost varies with the components selected.

    Your speakers are 4 ohm loads.
    Political Correctness'.........defined

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  • g-man
    g-man Posts: 46
    edited March 2009
    Thank you F1nut.

    Can I just replace the tweeters to RD0194-1, and use the same components in the X-over?
    No new components needed like capacitors,resistors?

    And i guess all four tweeters have to be changed...
    Stereo:
    Speakers:Polk SDA-1A
    cd/dvd:Marantz DV6200(HDCD)
    Amp: DUAL Audiophile Concept. (1992)

    ICE:
    Alpine CDA9887R
    Audison LRX 1.1K
    Audison LRX 4.5
    Amega Q-Comp50
    Amega Q-Comp60
    Sub: Focal Utopia WX21 BE
    Sub:? maybe 3 MM840.
    Stinger HPI signal,power,speaker cables
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited March 2009
    You can learn more about your 1A's in the Sticky: FYI POLK AUDIO - Speaker Wiring Schematics - Stereo Dimensional Array(SDA) posted by DarqueKnight at . . .

    http://www.polkaudio.com/forums/showthread.php?t=55888

    The http://www.polkaudio.com/forums/attachment.php?attachmentid=31010&d=1201824729 link . . . is your schematic in Adobe Acrobat pdf format.

    As F1 stated, it's a challenge to introduce the capacitor/resistor the RDO198-1 reqires for proper performance into the old high frequency circuit in your cabinets.

    I replaced SL2000's with RDO194-1's in my SDA SRS 2's and the improvement was very noticible and good. With perserverence, I was finally able to adapt the RDO198-1, but its introduction into your circuit looks more problematic.

    The RDO194-1 is a direct replacement for your SL2000's with absolutely no other modification of the crossover required and should be a pleasant improvement.
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  • fbm211
    fbm211 Posts: 1,488
    edited March 2009
    no new caps or resistors needed. 4 RDO194-1s will run about 200.00 from polk with the cp discount.Dont forget to mention your a member.You can upgrade your crossovers with dayton or sonicaps and mills resistors.
    SDA-2BTL with custom IC
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  • g-man
    g-man Posts: 46
    edited March 2009
    Thank you guys.
    I'll get in touch with Polk on monday..:)
    Stereo:
    Speakers:Polk SDA-1A
    cd/dvd:Marantz DV6200(HDCD)
    Amp: DUAL Audiophile Concept. (1992)

    ICE:
    Alpine CDA9887R
    Audison LRX 1.1K
    Audison LRX 4.5
    Amega Q-Comp50
    Amega Q-Comp60
    Sub: Focal Utopia WX21 BE
    Sub:? maybe 3 MM840.
    Stinger HPI signal,power,speaker cables
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  • gdb
    gdb Posts: 6,012
    edited March 2009
    G Man, I'ts been said by more than a few members here, that dropping down to a single tweeter on the 1As will make for a better image/soundstage,and the later editions of those all deleted the dimensional tweeter. I don't know the electronics part at all, or if any changes are needed on the crossover,but it might be worth it for you to investigate the possibilities. A nice bonus is that 2 RDOs are cheaper than 4 !! I've got a pair of 1As that I'd like to re-do the baffle on so that the tweeter will be positioned the same as the later models,(centered) and if possible without a lot of XO mods, go with 2 tweeters per cabinet like the newer ones have. Good luck !!:)
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