Problem with SDA SRS 2.3

JCL
JCL Posts: 145
edited December 2004 in Troubleshooting
I recently picked up a pair of SDA SRS 2.3’s. It appears that there is a problem with one of the crossovers. I have preformed the following tests based on forum comments in several threads in this forum. I am running the following equipment Sunfire Theater Grand preamp, Carver m200t for the front channel and for the tests below I ran the amp with an older NAD preamp since the Sunfire has no mono or balance control.

Performed the basic SDA set up as outlined in the manual. This showed that there was a problem. The left channel does not produce any sound when the preamp is set to mono and the balance is shifted to the right channel. The left channel does produce sound when the balance is shifted to the Left.

Confirmed that the phase of the amplifier connections to the speakers is OK. Checked numerous times.

Reversed polarity of the left speaker connection. This produced sound from both speakers when the balance was shifted to the left and the right. When listening in stereo the SDA effect seams to be there but when listening to vocals they appear to be unfocused. The soundstage is expanded but does not seam accurate.

Checked the connections on all drivers. All drivers in both speakers are set up correctly.

Anybody got any ideas as to what could be wrong or a possible solution? I believe that there is a problem with the left channel crossover. I have a multi-meter and could check the board if I knew what to look for. Any help would be greatly appreciated.
L600 (front), R200 (rear), R200 (rear surround), L400 (center), Sunfire HRS-10 (2)Marantz AV7706Sunfire Cinema Grand, Marantz M8077, Music Hall Stealth, Ortofon bronze cartridge, Parasound Zphono XRM, Sony UBP-X800
Post edited by JCL on
· Share on FacebookShare on Twitter

Comments

  • gmorris
    gmorris Posts: 1,179
    edited December 2004
    Originally posted by JCL
    The left channel does not produce any sound when the preamp is set to mono and the balance is shifted to the right channel. The left channel does produce sound when the balance is shifted to the Left.

    I guess I don't understand the problem. You state the left channel does not make sound when the balance is shifted to the right. This should happen.

    Maybe you could explain a little more, I'm a bit confused by your first description.
    Bob Mayo, on the keyboards. Bob Mayo.
    · Share on FacebookShare on Twitter
  • JCL
    JCL Posts: 145
    edited December 2004
    With the SDA SRS speakers there should be a sound produced to produce the SDA effect. This is per the manual and is a test that should be performed. The SDA SRS speakers do not reproduce sound like a normal speaker. They use a seperate set of drivers in each speaker to produce a wider soundstage by using a noise cancelation technique.
    L600 (front), R200 (rear), R200 (rear surround), L400 (center), Sunfire HRS-10 (2)Marantz AV7706Sunfire Cinema Grand, Marantz M8077, Music Hall Stealth, Ortofon bronze cartridge, Parasound Zphono XRM, Sony UBP-X800
    · Share on FacebookShare on Twitter
  • gmorris
    gmorris Posts: 1,179
    edited December 2004
    O.k. I got it now. That makes sense.

    There are plenty of SDA experts on this forum, sooner or later, someone will jump in here.

    Have you tried a call/email to Polk Customer Service? I think I'd start there....
    Bob Mayo, on the keyboards. Bob Mayo.
    · Share on FacebookShare on Twitter
  • BlueMDPicker
    BlueMDPicker Posts: 7,569
    edited December 2004
    Originally posted by JCL
    Anybody got any ideas as to what could be wrong or a possible solution? I believe that there is a problem with the left channel crossover. I have a multi-meter and could check the board if I knew what to look for. Any help would be greatly appreciated.

    Welcome to the forum.

    Unless I missed it in your problem report, you make no mention of the interconnect cable. Did you get the SDA interconnect cable with your purchase (the one that goes from speaker to speaker with blade/blade terminations)? If so, have you checked continuity of that cable? It could be a defective SDA IC cable.

    If you didn't get the cable, you can make one.

    Mike
    · Share on FacebookShare on Twitter
  • JCL
    JCL Posts: 145
    edited December 2004
    I have the cable and it is attached to the speakers. If the problem was the cable I would imagine that no sound would be produced from the opposite speaker when the ballance is changed from left to right. I will check both wires of the cable with a multimeter when I get home tonight to make sure that one wire is not bad.
    L600 (front), R200 (rear), R200 (rear surround), L400 (center), Sunfire HRS-10 (2)Marantz AV7706Sunfire Cinema Grand, Marantz M8077, Music Hall Stealth, Ortofon bronze cartridge, Parasound Zphono XRM, Sony UBP-X800
    · Share on FacebookShare on Twitter
  • JCL
    JCL Posts: 145
    edited December 2004
    Called customer service and spoke to Ken. He is sending me a comprehensive test procedure to go through tonight. Hopefully this will isolate the problem. Thanks Ken!!
    L600 (front), R200 (rear), R200 (rear surround), L400 (center), Sunfire HRS-10 (2)Marantz AV7706Sunfire Cinema Grand, Marantz M8077, Music Hall Stealth, Ortofon bronze cartridge, Parasound Zphono XRM, Sony UBP-X800
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 50,561
    edited December 2004
    There is a complete SDA test sheet available from Polk, contact Ken Swauger. I know you that you checked the wiring, but I still think that is the problem.

    EDIT: See what happens when you answer the door for the UPS guy before hitting send...lol. Glad to hear you're on the right track.
    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

    · Share on FacebookShare on Twitter
  • JCL
    JCL Posts: 145
    edited December 2004
    Ken faxed me the sheet so I will check out everything tonight. Thanks for the help. Hopfully I'll have this fixed tonight.
    L600 (front), R200 (rear), R200 (rear surround), L400 (center), Sunfire HRS-10 (2)Marantz AV7706Sunfire Cinema Grand, Marantz M8077, Music Hall Stealth, Ortofon bronze cartridge, Parasound Zphono XRM, Sony UBP-X800
    · Share on FacebookShare on Twitter