SDA 2B Problems

Fahzz
Fahzz Posts: 5
edited November 2009 in Vintage Speakers
I have a pair of SDA 2B's and the "effects" channel in the right speaker isn't working. The interconnect cable seems ok becuase the left speaker works fine when it 's connected.
Anybody have any ideas what the problem could be and whether parts are still available if I need them?
Thanks
Post edited by Fahzz on
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  • fbm211
    fbm211 Posts: 1,488
    edited November 2009
    Could be the driver is blown.Is it frozen? Give it a gentle push to see if it moves or if the voice coil is rubbing against the magnet.
    SDA-2BTL with custom IC
    Adcom 565 monoblocks--Monarchy Audio M-10 preamp
    Theta Data Basic Transport--Stello DA100 Signature DAC--Camelot Dragon Pro2 MK III
    Harman Kardon T-55c TT
    DH Labs Q-10 Signature Speaker Cables With Furez silver plated copper bananas
    Revelation Audio Labs Prophecy Cryo-Silver Reference AES/EBU
    Revelation Audio Labs Prophecy Cryo-Silver i2s digital cable
    4 Furutech FP-314Ag with FI-11cu Plugs/FI-11AG IECs--- Power Cords
    DH LABS REVELATIONS ICs-amps
    Revelation Audio Labs Paradise cryo-silver ICs-Source to pre
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  • george daniel
    george daniel Posts: 12,096
    edited November 2009
    You could swap the questionable driver to the other speaker to see if the problem follows it.Or,, remove it and test it to see if it is working.
    JC approves....he told me so. (F-1 nut)
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  • fbm211
    fbm211 Posts: 1,488
    edited November 2009
    And check to see if its connected.Welcome to club polk
    SDA-2BTL with custom IC
    Adcom 565 monoblocks--Monarchy Audio M-10 preamp
    Theta Data Basic Transport--Stello DA100 Signature DAC--Camelot Dragon Pro2 MK III
    Harman Kardon T-55c TT
    DH Labs Q-10 Signature Speaker Cables With Furez silver plated copper bananas
    Revelation Audio Labs Prophecy Cryo-Silver Reference AES/EBU
    Revelation Audio Labs Prophecy Cryo-Silver i2s digital cable
    4 Furutech FP-314Ag with FI-11cu Plugs/FI-11AG IECs--- Power Cords
    DH LABS REVELATIONS ICs-amps
    Revelation Audio Labs Paradise cryo-silver ICs-Source to pre
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  • Fahzz
    Fahzz Posts: 5
    edited November 2009
    Ok - I made sure it wasn't the wiring or an amplifier problem by switching the offending speaker wiring with the other one. I also gave it the suggested gentle push (es). Still no output from the effects speaker.

    Assuming this means a blown driver or broken crossover, are parts still available anywhere, or is this the end of a happy 21 year relationship?
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  • george daniel
    george daniel Posts: 12,096
    edited November 2009
    did you actually swap the driver with the good one?
    JC approves....he told me so. (F-1 nut)
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited November 2009
    Fahzz wrote: »
    Ok - I made sure it wasn't the wiring or an amplifier problem by switching the offending speaker wiring with the other one. I also gave it the suggested gentle push (es). Still no output from the effects speaker.

    Assuming this means a blown driver or broken crossover, are parts still available anywhere, or is this the end of a happy 21 year relationship?

    Hi Fahzz, and Welcome to Club Polk!

    When you gave a gentle inward push to the 6.5" drivers on the right speaker, did they move in and out smoothly and with no scratchy noise?

    If you have some time for testing, there is a good Adobe Acrobat pdf file in the post at http://www.polkaudio.com/forums/showthread.php?t=85837
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
    Conrad Johnson PV-5 w/mods
    TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
    Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
    Tuners w/mods Kenwood KT5020 / Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
    PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
    Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels
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  • Fahzz
    Fahzz Posts: 5
    edited November 2009
    George- I didn't swap the driver (I know my limitations)
    Inspiredsports - Push went smoothly, no scratchy noises- I'll try at least the non techie tests in the article.

    Thanks!
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  • george daniel
    george daniel Posts: 12,096
    edited November 2009
    actuall it's pretty easy,, 4 screws,, two wires,,and boom,, you're out,, look at it this way,, it's inevetable,, you're gonna have to remove it if you have to replace it right? So,, just swap them,if the problem follows--bad driver.Good luck,,let us know what you find out.
    JC approves....he told me so. (F-1 nut)
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited November 2009
    george daniel wrote: »
    actuall it's pretty easy,, 4 screws,, two wires,,and boom,, you're out,, look at it this way,, it's inevetable,, you're gonna have to remove it if you have to replace it right? So,, just swap them,if the problem follows--bad driver.Good luck,,let us know what you find out.

    But, be sure to find a Phillips head screwdriver that properly fits the screws, and don't over-tighten when putting them back in. And take your time, don't rush and you will end up enjoying one of the best sounding pairs of SDA's made.
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
    Conrad Johnson PV-5 w/mods
    TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
    Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
    Tuners w/mods Kenwood KT5020 / Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
    PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
    Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels
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  • fbm211
    fbm211 Posts: 1,488
    edited November 2009
    Be sure to check the inductor leads.I had the same problem you have and it turned out the leads on one of the inductors were broken off.
    Do you have a multi meter and soldering iron?
    SDA-2BTL with custom IC
    Adcom 565 monoblocks--Monarchy Audio M-10 preamp
    Theta Data Basic Transport--Stello DA100 Signature DAC--Camelot Dragon Pro2 MK III
    Harman Kardon T-55c TT
    DH Labs Q-10 Signature Speaker Cables With Furez silver plated copper bananas
    Revelation Audio Labs Prophecy Cryo-Silver Reference AES/EBU
    Revelation Audio Labs Prophecy Cryo-Silver i2s digital cable
    4 Furutech FP-314Ag with FI-11cu Plugs/FI-11AG IECs--- Power Cords
    DH LABS REVELATIONS ICs-amps
    Revelation Audio Labs Paradise cryo-silver ICs-Source to pre
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  • GTB
    GTB Posts: 87
    edited November 2009
    Had exactly the same problem with my 2B's. I had the polarity reversed on one of the speakers :o.

    Been using them for 20 years or so (I'm the original owner) and made a silly mistake. Make sure the black terminals on the speakers go to the black terminals on the amp, same with red.

    Greg
    Home Theater
    Polk RTi8
    Polk Monitor 40
    Polk CSi5
    Polk MicroPro 2000
    Visio 42 LCD
    Denon AVR 790
    Samsung BD 1600

    Two Channel
    Polk SDA 2B
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  • gdb
    gdb Posts: 6,012
    edited November 2009
    You might want to do a continuity test on the IC cable, if that checks out, then you could try "wiggling" the cable ends at LOW volume to see if that changes anything. Also, make sure that the "nuts" for the binding posts are on the correct posts. (they can unscrew all the way off of posts, and sometimes get re-installed **** backwards) Don't give up on them, they can be fixed, one way or another!! :)
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  • Fahzz
    Fahzz Posts: 5
    edited November 2009
    So reversed polarity on the offending unit could be the culprit? I will try to rule this out before I start poking around inside the thing. Thanks for everybody's interest and advice. I'll report back.
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  • Fahzz
    Fahzz Posts: 5
    edited November 2009
    Maybe that gentle pushing did the trick after all. I didn't do anything else to fix it. But then when I turned the system on today, Bebel Gilberto was right where she was supposed to be i.e. singing in the fireplace, with all the other musicians spread around the living room!

    Any ideas what caused this transient problem, in case it happens again?
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