Blade/Blade SDA cable question

madmax
madmax Posts: 12,434
edited February 2006 in Vintage Speakers
Could someone with a blade/blade SDA cable check to see if the large blade of one side connects to the small blade of the other?
Thanks!
madmax
Vinyl, the final frontier...

Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • F1nut
    F1nut Posts: 50,729
    edited February 2006
    Got a problem with a cable or are you just bored at 4:15am?
    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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  • Polk65
    Polk65 Posts: 1,405
    edited February 2006
    I'll check but only if you pull my finger first. :D




    I assume you mean continuity. Large connects to large.
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    F1nut wrote:
    Got a problem with a cable or are you just bored at 4:15am?

    I was just sitting around looking at the schematics for my SDA-SRS trying to figure out whether or not I could use a transformer for the SDA function if I made some modifications to the xover. I noticed a note about the connections which made me wonder.

    Isn't this the sort of thing all polk enthusiasts do at 4:15am? :confused::confused::confused:

    THANKS Polk65!

    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • dorokusai
    dorokusai Posts: 25,577
    edited February 2006
    The wiring inside the speaker changes in the older SDA's, not the cable.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    dorokusai wrote:
    The wiring inside the speaker changes in the older SDA's, not the cable.

    That is what the schematics seemed to show but it could have been read either way. I figured it was better to actually check one. BTW, it's looking like too much hassle to make them work with a transformer. I'm still looking though.
    Thanks!
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • hoosier21
    hoosier21 Posts: 4,413
    edited February 2006
    madmax wrote:
    That is what the schematics seemed to show but it could have been read either way. I figured it was better to actually check one. BTW, it's looking like too much hassle to make them work with a transformer. I'm still looking though.
    Thanks!
    madmax

    Hasn't Ken already done this? Thought I saw somebody post he modified "something" to allow the transformer to be used on BB interconnect?
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  • F1nut
    F1nut Posts: 50,729
    edited February 2006
    hoosier21 wrote:
    Hasn't Ken already done this? Thought I saw somebody post he modified "something" to allow the transformer to be used on BB interconnect?

    That's what I thought, but someone recently stated that it wasn't true. Ken, care to chime in here?
    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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  • hoosier21
    hoosier21 Posts: 4,413
    edited February 2006
    http://www.polkaudio.com/forums/showthread.php?t=37150

    there is the thread
    Dodd - Battery Preamp
    Monarchy Audio SE100 Delux - mono power amps
    Sony DVP-NS999ES - SACD player
    ADS 1230 - Polk SDA 2B
    DIY Stereo Subwoofer towers w/(4) 12 drivers each
    Crown K1 - Subwoofer amp
    Outlaw ICBM - crossover
    Beringher BFD - sub eq

    Where is the remote? Where is the $%#$% remote!

    "I've always been mad, I know I've been mad, like the most of us have...very hard to explain why you're mad, even if you're not mad..."
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  • F1nut
    F1nut Posts: 50,729
    edited February 2006
    Yeah, I remember that one. I've spoken with Tim, nice guy, but we didn't talk about the transformer. I also remember someone posted a pic of the "Ken cable" in here, but I also recall someone else saying it wasn't true.
    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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  • Tour2ma
    Tour2ma Posts: 10,177
    edited February 2006
    I e-mailed and spoke to Ken on the phone. He told me there's no such animal for pre-tl SDA's.
    More later,
    Tour...
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    Tour2ma wrote:
    I e-mailed and spoke to Ken on the phone. He told me there's no such animal for pre-tl SDA's.

    Well that doesn't seem to make sense. Certainly you can wire up the 1.2's or SDA-SRS above S/N 5000 that way.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    Somewhere their is a pic of the "Ken Special". It had a connection which fed the transformer with a ground from the speaker terminal and one of the SDA connections. Looking at the schematic you can see it bypasses a choke which is in series with one of the SDA lines. Here is the problem, I know there are two different schematics for the SDA-SRS. There has to be one for s/n's below 5000 and another for s/n's above 5000. I don't know which one is shown in the compenium.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • BobMcG
    BobMcG Posts: 1,585
    edited February 2006
    Yes, I have posted pictures a number of times over the years of the custom AI-1 made by Ken for my brother's B/B 1cs. It has been working quite fine for ten years now and counting, thank you very much.

    What do some of you guys think I was doing? Blowing smoke up your asses?
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  • dorokusai
    dorokusai Posts: 25,577
    edited February 2006
    Yes.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • BobMcG
    BobMcG Posts: 1,585
    edited February 2006
    dorokusai wrote:
    Yes.

    And you think it was easy?

    I don't smoke so it's quite a feat!
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    Hi Bob,
    Do you know the S/N of one of his 1C's?
    Thanks!
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • SCompRacer
    SCompRacer Posts: 8,511
    edited February 2006
    madmax wrote:
    I was just sitting around looking at the schematics for my SDA-SRS trying to figure out whether or not I could use a transformer for the SDA function if I made some modifications to the xover. I noticed a note about the connections which made me wonder.


    madmax

    I've only seen early and late SRS 2 schematics. On the early blade/blade speaker, the wide blade, called Pin A (# 1), is connected to the positive side and the narrow blade, called Pin B, (# 2) is connected to the negative side of the dimensional tweeter/drivers. Each terminal on the blade/blade SDA interconnect cable carries a signal.

    On the late pin/blade SRS 2, the pin is connected to the negative side of the dimensional drivers, and the blade is connected to the negative speaker terminal. Just the pin carries a signal in the standard pin/blade SDA interconnect. The blade terminal is not connected. On the pin/blade A1 non common ground IC, the pin and blade carry a signal through one side of the isolation transformer windings.

    I don't think you would want to connect one winding of an isolation transformer to a positive and negative terminal of the blade/blade speaker. But couldn't you connect one lead of the isolation transformer winding to the narrow blade of an early speaker (narrow being the negative side of the dimensional array) and the other lead of the winding connected externally to the negative speaker terminal? I would expect to find Bob's example wired like that.
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    That is what I was thinking. There is a choke going to ground which would be bypassed by doing that, I think.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • BobMcG
    BobMcG Posts: 1,585
    edited February 2006
    madmax wrote:
    Hi Bob,
    Do you know the S/N of one of his 1C's?
    Thanks!
    madmax

    Sorry Chuck, I don't know the number off hand but I could get it if you need it. The serial numbers did fall into the accepted range as listed by Polk though as shown below. (If I remember right, and sorry for the poor upload.)
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  • I-SIG
    I-SIG Posts: 2,243
    edited February 2006
    I'm watching this thread with a very keen interest...

    Wes
    Link: http://polkarmy.com/forums

    Sony 75" Bravia 4K | Polk Audio SDA-SRS's (w/RDO's & Vampire Posts) + SVS PC+ 25-31 | AudioQuest Granite (mids) + BWA Silver (highs) | Cary Audio CAD-200 | Signal Cable Silver Resolution XLR's | Rotel Michi P5 | Signal Cable Silver Resolution XLR's | Cambridge Audio azur 840C--Wadia 170i + iPod jammed w/ lossless audio--Oppo 970 | Pure|AV PF31d
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  • madmax
    madmax Posts: 12,434
    edited February 2006
    BobMcG wrote:
    The serial numbers did fall into the accepted range as listed by Polk though as shown below.
    Thanks! That's what I needed to know. Mine don't and it isn't worth the hassle...
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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