What goes through the SDA cable?? Ken maybe?

madmax
madmax Posts: 12,434
edited October 2006 in Vintage Speakers
Can anyone explain what goes through the SDA cable on SDA's? My 1.2's have one wire for signal and another for ground. So what is actually being fed to what? I can see maybe the left side going to the right or the right side going to the left but not both at the same time. I'm confused.
madmax
Vinyl, the final frontier...

Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited October 2006
    Chuck, you feeling ok?
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • jdhdiggs
    jdhdiggs Posts: 4,305
    edited October 2006
    Delta's Chuck, out of phase deltas...
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin
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  • Ricardo
    Ricardo Posts: 10,636
    edited October 2006
    If I remember well from my crossover upgrade, the pin contact just links something on the drivers...maybe the + of one side with the - of the other (EDIT:...with a bunch of components in between...), or something like that. The Tweeters have no relation with this pin. The schematics will tell you; I know they are posted somewhere here.
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  • madmax
    madmax Posts: 12,434
    edited October 2006
    I'm thinking we have stuff firing from both sides.
    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 October 2006
    here you go
    Dodd - Battery Preamp
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    ADS 1230 - Polk SDA 2B
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    Where is the remote? Where is the $%#$% remote!

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  • jdhdiggs
    jdhdiggs Posts: 4,305
    edited October 2006
    madmax wrote:
    I'm thinking we have stuff firing from both sides.
    madmax

    Yup, but it's the delta's between the two channels. The right signal runs out of phase into the left signal and whatever signal isn't cancelled out is put out on the drivers. But that's what I got fromt the simplistic explanation at polk and operating on the 1B's so it may be a bit off but it passess the total BS test...
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin
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  • madmax
    madmax Posts: 12,434
    edited October 2006
    So with the cable disconnected the SDA drivers do operate in phase. This was throwing me as I thought they did not operate at all with no cable. Still having a little trouble getting a feel for exactly what is happening.
    madmax

    Edit: I also thought the lowest bass was cut off to the SDA drivers. I don't see where that is happening.
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • jdhdiggs
    jdhdiggs Posts: 4,305
    edited October 2006
    IIRC, looking at the speakers, the left speakers SDA will be playing
    [L]-[Ri] and the right would be playing [R]-[Li] where the sub i indicates out of phase information.

    My understanding is that the circuit is broken without the SDA cable so the SDA drivers will not operate without the cables.

    Once again, this is my understanding based off of a discussion with Stu over a year ago so I could just be blowing smoke.
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin
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  • madmax
    madmax Posts: 12,434
    edited October 2006
    The circuit is not broken. If you follow the path with the cable disconnected you have gnd through a 16mh coil to the - of the drivers and + through a 1 mh coil to the plus side of the driver. The capacitor limits the high frequencies but I thought you had to have a resistor in series with it. I'm still confused.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • heiney9
    heiney9 Posts: 25,203
    edited October 2006
    Max, it's magic....don't worry about it, just enjoy it. ;):p .

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • heiney9
    heiney9 Posts: 25,203
    edited October 2006
    Seriously MM, this is my tried an true link for SDA tech knowledge.

    http://www.polksda.com/srsreview.shtml

    reading the first page may enlighten you a little bit. I know we've all read this artcile before but there's good info in it about how the SDA works. It's not from the engineers POV but it may lessen your sudden confusion.

    YMMV

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • AsSiMiLaTeD
    AsSiMiLaTeD Posts: 11,728
    edited October 2006
    I think madmax is looking for a more technical explanation...
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  • riglehart
    riglehart Posts: 276
    edited October 2006
    madmax wrote:
    So with the cable disconnected the SDA drivers do operate in phase.

    Huh. I always assumed the sda drivers went dead if you unplugged the interconnect. Cool.
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  • F1nut
    F1nut Posts: 50,729
    edited October 2006
    They don't work with the cable disconnected. They appear to move, but that's because of the sealed design.
    Political Correctness'.........defined

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    President of Club Polk

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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited October 2006
    madmax wrote:
    The circuit is not broken. If you follow the path with the cable disconnected you have gnd through a 16mh coil to the - of the drivers and + through a 1 mh coil to the plus side of the driver. The capacitor limits the high frequencies but I thought you had to have a resistor in series with it. I'm still confused.
    madmax


    I agree if the cable is disconnected then the dimensional array is working in phase but at a different cross over point. From what I see in the schematic.

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    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited October 2006
    jdhdiggs wrote:
    My understanding is that the circuit is broken without the SDA cable so the SDA drivers will not operate without the cables.


    Yes that statement seems true also, because without the cable than the SDA drivers will not operate the way they where intended. But on the other hand will operate like any other speaker when disconnected.


    Ok getting as clear as mud :eek:

    Speakers
    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Electronics
    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR


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  • madmax
    madmax Posts: 12,434
    edited October 2006
    heiney9 wrote:
    Max, it's magic....don't worry about it, just enjoy it. ;):p .

    H9

    I've done that for too long. Now I want to know the guts to the story. :D

    Much like tubes it is cool to know they sound good and where to buy them but after awhile you start wondering just how the electrons move through them, why they are blue, why you have such high voltages etc.

    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 October 2006
    Buy a book....with actual words instead of pop-ups.
    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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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited October 2006
    Well, its the same thing as having three ducks and three nuns.

    I seem to recall isolating the SDA drivers at some point and that they did not work without the cable.

    RT1
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