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Thread: Recondition

  1. #1

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    Default Recondition

    I have a pair of SDA's, 2 tweeters, 3 midrange and sub woofer. Where can I get them reconditioned and upgraded? I live in NJ and would prefer to drop off and pick up instead of shipping.

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    SDA 2 (originals) Can you solder? Do it yourself.

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    Restoring vintage Polks tends to be a DIY job, and is can be a lot of fun. You will find all the resources and knowledge you need to do the job right... here on the forum. search the Vintage Speakers section and ask questions. We are here to help.


    Welcome to CP!
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    I have been restoring my 2.3's and the wealth of help and knowledge here is unbelievable. Lot's of great people always willing to go the extra mile to help someone out!
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    Thanks, what parts should be replaced?

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    Welcome to CP. Need to know what model of Polk, Polks, you have. What kind of issues are you having with them?
    HT: LSI15, LSIC, LSIFX, Emo XPA-3 Onkyo TXNR809, Sony BDP-S500, PannyDMP-BDT320, MIT S1 SC. Mit 73842dlp
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    I have SDA 2's. No issues but I thought that after 30 years some sort of maintenance is required. I have a Carver MXR 130 receiver and a Carver TFM 25 power amp. I noticed on the back of the SDA's that they should not be used " bridged" to amp/receiver. Could someone explain?

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    Quote Originally Posted by Middlebush View Post
    I have SDA 2's. No issues but I thought that after 30 years some sort of maintenance is required. I have a Carver MXR 130 receiver and a Carver TFM 25 power amp. I noticed on the back of the SDA's that they should not be used " bridged" to amp/receiver. Could someone explain?
    Some stereo and multi-channel amplifiers are readily "bridged" in the field. Bridging involves connecting two amplifier channels together so as to provide more power to the speakers. The typical increase is 3X the power of the single channel. So, for example, a "100 watt" bridgeable stereo amplifier becomes a "300 watt" bridged mono amplifier.

    Problem is, that the SDA circuitry in the Polk speakers becomes VERY unhappy with the ground path of bridged amplifiers. SOME SDA speakers can be used with an isolation transformer in the SDA cable, earlier SDA speakers are just flat-out NOT compatible with bridged amps. Your SDA 2s are the "NOT compatible" kind.

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    Do you have any pictures of them? What would you like to change about them?

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    Just the capacitors and resistors really need to be replaced at this age they are probably not to spec and there is so much better quality out now.

    Here is two good reads to get you started, 1st one give it time it's fairly large

    http://vr3mods.com/uploads/SDA_Handbook_2011_Rev2.pdf

    http://www.gimpod.com/sda-id.html





    Quote Originally Posted by Middlebush View Post
    Thanks, what parts should be replaced?
    Last edited by PolkieMan; 07-22-2013 at 03:34 AM.

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    Question, when my Carver MXR 130 & TFM 25 get back from Oregon for rehab, can I bridge them and use my SDA 2's without the connecting cord?

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    Yes, but if you don't use the SDA cable, you might as well sell them.
    'Political Correctness'.........defined

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    any other way to set them up?

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    Hang on a sec.....what are you wanting to bridge? You've only got one amp.
    '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."

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    I don't have to bridge, I can use the Carver TFM 25 to power the Polks and the carver MXR 130 receiver to power the rm8's. Is someway with a "Y" cord, I was talking to Roland Barr from HI tech audio in Oregon,who serviced my Carver, but something got lost in the translation.

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    Quote Originally Posted by Middlebush View Post
    I don't have to bridge, I can use the Carver TFM 25 to power the Polks and the carver MXR 130 receiver to power the rm8's. Is someway with a "Y" cord, I was talking to Roland Barr from HI tech audio in Oregon,who serviced my Carver, but something got lost in the translation.
    I believe he meant to install y connectors in place of the pre-amp out/main-amp in jumpers, so you could feed both the receivers internal amp, as well as the external TFM-25.
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    thanks , great info great help

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