Recondition

Middlebush
Middlebush Posts: 13
edited July 2013 in Vintage Speakers
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.
Post edited by Middlebush on
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  • Schurkey
    Schurkey Posts: 2,101
    edited July 2013
    SDA 2 (originals) Can you solder? Do it yourself.
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  • nooshinjohn
    nooshinjohn Posts: 25,416
    edited July 2013
    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!:cheesygrin:
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • zane77
    zane77 Posts: 1,696
    edited July 2013
    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!
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV
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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    Thanks, what parts should be replaced?
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  • heartystatue
    heartystatue Posts: 329
    edited July 2013
    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:biggrin: Onkyo TXNR809, Sony BDP-S500, PannyDMP-BDT320, MIT S1 SC. Mit 73842dlp
    2ch: SDA-SRS 2.3 Fully modded. BAT VK500 w/batpak, BAT VK5I, Essence HDACC.
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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    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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  • Schurkey
    Schurkey Posts: 2,101
    edited July 2013
    Middlebush wrote: »
    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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  • zingo
    zingo Posts: 11,258
    edited July 2013
    Do you have any pictures of them? What would you like to change about them?
    Jake
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  • PolkieMan
    PolkieMan Posts: 2,446
    edited July 2013
    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




    Middlebush wrote: »
    Thanks, what parts should be replaced?
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    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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  • F1nut
    F1nut Posts: 50,557
    edited July 2013
    Yes, but if you don't use the SDA cable, you might as well sell them.
    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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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    any other way to set them up?
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  • F1nut
    F1nut Posts: 50,557
    edited July 2013
    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 t-u-r-d by the clean end."

    President of Club Polk

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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    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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  • westmassguy
    westmassguy Posts: 6,850
    edited July 2013
    Middlebush wrote: »
    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.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • Middlebush
    Middlebush Posts: 13
    edited July 2013
    thanks , great info great help
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