Another SDA CRS, this time the +

corticocortico Posts: 405
edited June 30 in Vintage Speakers
Just got this CRS + pair, seems real wood veneer, but I’m not sure which iteration this is. Probably transitional because it still has the holes where the previous 2 tweeter versions had the blade/blade jack.

I am willing to upgrade it for the RD0198, never heard one before. All it takes is a 5.8uf cap across the 2.7ohm resistor, right?

Thanks for you guidance.

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"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
Post edited by cortico on

Comments

  • F1nutF1nut Posts: 40,510
    You'll have to plug that hole.

    The TL schematic is posted 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."


  • westmassguywestmassguy Posts: 6,154
    F1nut wrote: »
    You'll have to plug that hole.

    The TL schematic is posted here.

    This ^^^^^, and the 2.7 ohm resistor is already there. You're shunting it with the 5.8uf Capacitor.

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  • corticocortico Posts: 405
    edited July 2
    Most definitely! I’ll plug the hole with two matching rubber plug caps.

    I liked the way the blade / blade two tweeters version sounded, the dimensional tweeter was unplugged... I know diferente animal.
    Courious about this.
    Thanks
    F1nut wrote: »
    You'll have to plug that hole.

    The TL schematic is posted here.
    F1nut wrote: »
    You'll have to plug that hole.

    The TL schematic is posted here.

    This ^^^^^, and the 2.7 ohm resistor is already there. You're shunting it with the 5.8uf Capacitor.

    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
  • corticocortico Posts: 405
    These sound sweet, very nice and mellow mid range. I toke a picture of a crossover. The stereo mid-bass is the 6510 and the dimensional 6511...

    I measured resistance between meg and pos terminal I got different readings:

    Left 4.9ohm
    Right 5.8ohm
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    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
  • corticocortico Posts: 405
    Ah! Found a loose inductor in one speaker... wow

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    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
  • F1nutF1nut Posts: 40,510
    That'll be the high one.
    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."


  • monepolkmonepolk Posts: 871
    Yeah I had a similar with the pair I bought.
    http://forum.polkaudio.com/discussion/179087/picked-up-crs/p1
  • corticocortico Posts: 405
    I have soldered the connections and replaced the ties, it's all well secured now.
    Could a 5.6UF cap be used instead of 5.8UF on the TL mod? is just about 3.5% off.
    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
  • F1nutF1nut Posts: 40,510
    If that 5.6uF is +/- 10% and it's -10% it's no longer 3.5% off.
    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."


  • mlistens03mlistens03 Posts: 2,245
    Nice find!
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • corticocortico Posts: 405
    F1nut wrote: »
    If that 5.6uF is +/- 10% and it's -10% it's no longer 3.5% off.

    Good point, thanks.

    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
  • corticocortico Posts: 405
    I have used Clarity ESA and Sonicaps Gen I on crossovers, both excellent.

    For this project, I am thinking of Jantzen Superior for the tweeter and Jantzen Standard for the ones parallel with mid-bass drivers. Anyone used Jantzen caps on these Polks before?
    "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel Von Recklinghausen
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