Another SDA CRS, this time the +

corticocortico Posts: 482
edited June 2018 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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Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
Cambridge Audio phono pre
Pioneer PL530 turntable, Shure M97XE cartridge
Belden ICs
MIT T2 speaker cables
Polk Audio LS70

"If it measures good and sounds bad, it is bad"
Post edited by cortico on

Comments

  • F1nutF1nut Posts: 41,229
    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: 6,278
    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: 482
    edited July 2018
    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.

    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
  • corticocortico Posts: 482
    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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    rmfdta5g1f10.jpeg


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    kh6wakwiaxqi.jpeg
    5rxl02qvnmox.jpeg
    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
  • corticocortico Posts: 482
    Ah! Found a loose inductor in one speaker... wow

    670ff4ummd34.jpeg
    aekh0cacbh1t.jpeg
    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
  • F1nutF1nut Posts: 41,229
    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: 931
    Yeah I had a similar with the pair I bought.
    http://forum.polkaudio.com/discussion/179087/picked-up-crs/p1
  • corticocortico Posts: 482
    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.
    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
  • F1nutF1nut Posts: 41,229
    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: 2,491
    Nice find!
    Micah
    music on vinyl; https://www.discogs.com/user/mlistens03/collection
    Technics SL3200 turntable; Shure M97xE cart; Hagerman Audio Labs Bugle 2; NAD C352 integrated; KEF Q150 speakers; Velodyne VA-907 subwoofer; home-built stands, generic cables but will upgrade soon...

    desktop; Lenovo G50 running Win10, Yamaha RX-v665 AVR, JBL e30 headphones
    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: 482
    F1nut wrote: »
    If that 5.6uF is +/- 10% and it's -10% it's no longer 3.5% off.

    Good point, thanks.

    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
  • corticocortico Posts: 482
    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?
    Parasound HC/A 2200II < PL/D 2000 < DA/C 1100HD < CD/C1500
    Cambridge Audio phono pre
    Pioneer PL530 turntable, Shure M97XE cartridge
    Belden ICs
    MIT T2 speaker cables
    Polk Audio LS70

    "If it measures good and sounds bad, it is bad"
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