SDA-SRS polarity ?

Tony M
Tony M Posts: 11,151
edited September 2010 in Vintage Speakers
In the schematic for my speakers ( SDA-SRS2 )I see where the large blade from one is POS. and when you plug the other end into the other channel, the schematic says it should be NEG..

I had this question before and I guess I just gave up and soldered POS. wires to each large blade connector when I replaced the sockets.

Anybody know about this schematic in this sticky why it says one is POS and the other end is NEG.?

Wouldn't that be a short for the amplifier outputs?
Most people just listen to music and watch movies. I EXPERIENCE them.
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  • george daniel
    george daniel Posts: 12,096
    edited September 2010
    with my 1c's,, the neg from the socket goes to the neg binding post. Is that what you are talking about?
    JC approves....he told me so. (F-1 nut)
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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    No.

    Just the interconnecting sockets.

    In the diagram, large on one is Positive and the other channel the small is Positive.

    I just went and looked at other models and it looks like that is the way it was designed.

    How does it not short out..
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • F1nut
    F1nut Posts: 50,546
    edited September 2010
    I had this question before and I guess I just gave up and soldered POS. wires to each large blade connector when I replaced the sockets.

    That is incorrect. The positive (blue wire) on the right channel should be soldered to the large blade. The positive (black wire) on the left channel should soldered to the small blade. You must also have the negative wires connected to the SDA sockets and you have to run two wires from speaker to speaker. Large to large and small to small.
    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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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    george daniel wrote: »
    with my 1c's,, the neg from the socket goes to the neg binding post. Is that what you are talking about?

    I just went and looked at your schematic.

    You only have a Neg. connecting cable on that model and it doesn't show to connect the other end to the Pos side anywhere on the schematic.

    My model and another I looked at clearly shows and says to flip one sockets polarity from the other channels'. I wondered why one of my sockets was upside down from the other when I had to replace my older ones about a year ago. Maybe I have to take the sockets back out and check my polarity again. I thought I had great sound from these and all might be ok after all. I'll find out soon enough. And any other insight would be appreciated.
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    Thanks Jessie.
    I always knew mine needed 2 wires to work the interconnecting path.
    That's what the schematic shows. I have to look at what I did again for sure!

    Why doesn't the flipping short something out?:confused:
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • F1nut
    F1nut Posts: 50,546
    edited September 2010
    I believe that is explained in Matt Polk's white papers, but I'm not looking it up. :)
    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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  • Toolfan66
    Toolfan66 Posts: 17,237
    edited September 2010
    The SDA 1.2's had/have the tweeters wired out of phase. Mine were not the only ones like that, The neg wires on the crossovers went to the pos on the tweeter. If not for Ben doing tl upgrades we might still not know it. Not sure if all 1.2 models were wired this way but there were 3 sets here in club Polk wired that way.
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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    I must have wired it back right or else I might have shorted something. I'm really curious though.

    The white pages... I don't blame you.
    I just have to accept some things in life even if my brain can't comprehend them.:D

    Thank you
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    I'm feeling better in these last 4 months and I can do more things and checking the full wireing layout of my SRS2s is also going to happen when I go to put your rings inside the cabinets.

    That will be a perfect time since all will be disconnected and will have to be labeled.

    They sound so good, they have to still be wired right I would assume.;)
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • F1nut
    F1nut Posts: 50,546
    edited September 2010
    tony millard wrote: »
    I must have wired it back right or else I might have shorted something. I'm really curious though.

    It won't cause a short, it will cause the signal to be out of phase.
    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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  • Schurkey
    Schurkey Posts: 2,101
    edited September 2010
    tony millard wrote: »
    In the schematic for my speakers ( SDA-SRS2 )I see where the large blade from one is POS. and when you plug the other end into the other channel, the schematic says it should be NEG..

    I had this question before and I guess I just gave up and soldered POS. wires to each large blade connector when I replaced the sockets.

    Anybody know about this schematic in this sticky why it says one is POS and the other end is NEG.?

    Wouldn't that be a short for the amplifier outputs?
    Blade/Blade SRS 2?

    Wired just like the SDA 1B.

    The full-range electrical signal from one speaker is routed through a big capacitor pair (185 uF in the 1B, the same or similar in the SRS 2) to trim the bandwidth, and is then applied to the ground circuit of the SDA drivers ahead of the inductor. The signal from one channel therefore cancels or reinforces the signal from the other channel by acting on the ground path of the SDA drivers. Thus the need for TWO conductors in the SDA cable--each conductor carries a signal from one speaker to the ground side of the other speaker.

    Applying some electrical signal from one speaker to the ground path of the other speaker is part of the reason the impedance of these SDA speakers tends to be on the low side; and it's why common-ground amps are required--the electrons split from one speaker/channel have to find their way "home" through the other channel's ground path.

    This wiring system is NOT shared by ALL the "SDA" speakers. Polk used at least three different wiring methods to generate the SDA signal. Another method is to just tie the ground side of the SDA drivers together. I have a hunch--unproven at this point--that tying the ground sides together works but not as "dramatically" as the 1B/SRS 2 method. That's fodder for another post.
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  • Tony M
    Tony M Posts: 11,151
    edited September 2010
    Thanks Shurkey

    What an idea they had and how they came about it without shorting the amps is amazing.
    Thanks for explaining it as simply as you did.

    I just have to learn more about crossovers to FULLY understand. That I plan to do. It's on my bucket list..;):D
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • yairi
    yairi Posts: 3
    Hey, hi, old thread but I am facing the exact same issue. So, the white from the left channel mates to the blue on the right channel, and the black from the left channel mates to white on the right channel? I tried that and my crown amp didn't like it and I shut down fast. The problem is the same going from white to white too. I've got to get this resolved. Same model, the SRS SDA 2. Advice is really appreciated, thank you.
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  • yairi
    yairi Posts: 3
    Oh, I have to mention that I didn't have an interconnect when I got these about 15 years ago and made my own with the proper plugs. I found the connection poor and so never had the SDA effect. I decided the other day to wire directly without the plugs. I tried white to white first as that made sense and also called Polk to confirm. I was told white to white was correct but it quickly shut down my NAD amp. So I'm just puzzled. I've checked all the wiring and nothing look messed with.
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  • yairi
    yairi Posts: 3
    So, rereading this, I decided to give it another shot, white to black and white to blue, and what do you know, this time it's fine, sounds great and my amp is running cool. Hmmmm, what happened the last time? So, it' NOT white to white. I wonder why the guy at Polk agreed with me when I asked if white to white was correct? Maybe he was just bored?
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  • pitdogg2
    pitdogg2 Posts: 25,441
    yairi wrote: »
    . I wonder why the guy at Polk agreed with me when I asked if white to white was correct? Maybe he was just bored?

    A lot of newbies at Polk who were not born yet when this socket was in use. they just don't understand.

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