Blade/blade SDA question

ratpin
ratpin Posts: 85
in 2 Channel Audio
I’m sound checking some SDA CRS speakers and don’t seem to be getting an SDA signal when I adjust balance. The cable that came with the speaker had been sliced at some point. I just want to confirm that the wide blades should share the same wire as well as the narrow blades sharing a wire. I noticed the sockets in the back of the speakers are opposing with wide blade up on one and narrow blade up on one. Is that how it should be or do I need to flip the interconnect wires? Thankscaihhk6d1me7.jpeg
Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    The switch is inside the cabinet. So the wire color on the wide blade on one speaker will be the wire color on the narrow blade on the other cabinet.
    Understand?
    The wires on the cable itself you should get continuity between both wide blades. You should get ZERO continuity if you try between wide blade and narrow blade.
    Understand?
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  • ratpin
    ratpin Posts: 85
    Weird. I wonder what’s going on. I should be able to confirm interconnect signal with balance adjustments correct? I’m getting no crosstalk.

    Help me understand…lol
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    Check the cabinet and make sure wires are on the correct socket blade and have a good connection. The blade/Blade socket can be your weak link. They seem to be fragile and the connection point where the blades go into can become loose with age where they do not make a good tight fit.
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  • F1nut
    F1nut Posts: 50,496
    Is the Onkyo common ground?
    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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  • pitdogg2
    pitdogg2 Posts: 25,413
    Good call on the Onkyo, IIRC I thought they were.
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  • ratpin
    ratpin Posts: 85
    F1nut wrote: »
    Is the Onkyo common ground?

    Yes it is.

    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • F1nut
    F1nut Posts: 50,496
    Double check the SDA cable. If ok, then time to open up the cabinets.
    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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  • xschop
    xschop Posts: 5,000
    Perfect time to dump those X-overs for some CRS+ X-overs.
    Don't take experimental gene therapies from known eugenicists.
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  • ratpin
    ratpin Posts: 85
    xschop wrote: »
    Perfect time to dump those X-overs for some CRS+ X-overs.

    Any chance you have some?

    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • xschop
    xschop Posts: 5,000
    edited October 2023
    @VSAT88 may have some spare.

    What MW drivers do you have in those?
    6503,6510 in the stereo slot, and 6511's in the SDA slots are good to go. I prefer the 6502's in the SDA slot for more clarity.
    Don't take experimental gene therapies from known eugenicists.
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  • F1nut
    F1nut Posts: 50,496
    xschop wrote: »
    Perfect time to dump those X-overs for some CRS+ X-overs.

    Bad advice, the drivers are different.
    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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  • ratpin
    ratpin Posts: 85
    That's right, Mine run 4 MW6503's
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • xschop
    xschop Posts: 5,000
    F1nut wrote: »
    xschop wrote: »
    Perfect time to dump those X-overs for some CRS+ X-overs.

    Bad advice, the drivers are different.

    Yes, He'd have to swap in a couple 6511's on the SDA slots too.
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    YES and ROB those are so plentiful everywhere...Right. (rolls eyes) He'd have better luck finding dentures for chickens!
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  • xschop
    xschop Posts: 5,000
    That's why I suggested 6502's. A worn set of 6502's has better suspensions than 6511's new lol
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    xschop wrote: »
    That's why I suggested 6502's. A worn set of 6502's has better suspensions than 6511's new lol

    MW 6502 1.97 5.16 N 1.47 E - 3N/M 3.52 Ohms 44 Hertz

    MW 6511 1.405 4.34 N 3.496 E - 3N/M 3.13 Ohms 29 Hertz

    scratches head....
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  • xschop
    xschop Posts: 5,000
    Other than the small DCR difference, I bet a worn 6502 will spec closer to a NOS factory 6511, if it even exists.

    Scratches balls....
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    Actually I'm looking at the FS being much better in the 6511 vs the 6502. Unless I'm misinterpreting the FS the 6502 cannot go as low.
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  • xschop
    xschop Posts: 5,000
    That's free-air resonance at NOS factory specs. A nice broke-in 6502 goes down to 30HZ all day in a set of CRS+. A good 6511 will have a little more SPL in the lowest frequencies, but the trade-off is the 6502 reproduces the midrange with more clarity.....from experience.
    Don't take experimental gene therapies from known eugenicists.
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  • ratpin
    ratpin Posts: 85
    My early CRS's have dual 6503
    Polk: / SDA-CRS / SDA-1C / M-10B / M-7B / M-5 / M-5jr / RTA-11T / LSIM703 / LSIM704 / LSIM706 / RTI8 / CSI3 / CSI5 / RTI4 / RTI-A5 / CSI-A6 / RC80i / RC85i / RC6s / PSW300 / Atrium6 / Atrium4 / About a dozen pair of Atrium45 lol.
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  • xschop
    xschop Posts: 5,000
    ratpin wrote: »
    My early CRS's have dual 6503

    And a dual tweeter design that Polk abandoned.

    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,458
    The passive radiator takes over at well above either of those Fs figures and therefore the energy is used to move the passive where the MW barely moves at all. Fs will always be lower in the speaker with the more compliant suspension, and with the higher moving mass.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • pitdogg2
    pitdogg2 Posts: 25,413
    ratpin wrote: »
    My early CRS's have dual 6503

    Correct but @xschop advocated you switch out the CRS XO for the CRS+ XO which would mean you would need 2 mw6511's to replace 2 mw6503.
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  • F1nut
    F1nut Posts: 50,496
    Like I said, bad advice.
    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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  • Gardenstater
    Gardenstater Posts: 4,458
    edited October 2023
    pitdogg2 wrote: »
    ratpin wrote: »
    My early CRS's have dual 6503

    Correct but @xschop advocated you switch out the CRS XO for the CRS+ XO which would mean you would need 2 mw6511's to replace 2 mw6503.

    Was the passive radiator different, for the different versions that used different MWs with different Fs and compliance? I would think that would effect the moving mass required in the passive to tune the system properly.

    When I said before that the MW barely moves, I meant in the vicinity of the resonant frequency of the passive. It operates in phase around there and when the MW is pushing out, so does the passive. That's why it is in resonance. It assumes almost all of the displacement while the MW cone barely moves. I have seen my MWs literally going nuts far below that frequency, like when playing something like Also Sprach Zarathustra.

    p. 12 of the SDA Handbook, says yes but only for the twin blade and not the pin blade CRS+. A bit perplexing......

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    Post edited by Gardenstater on
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • xschop
    xschop Posts: 5,000
    F1nut wrote: »
    Like I said, bad advice.

    Aye Cap'n Redundant.
    Don't take experimental gene therapies from known eugenicists.
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