What are my mod options for my SDA CRS+?

satlite
satlite Posts: 8
in Vintage Speakers
Scored a pair of these a few months back. Pin/blade with original sl2000 tweeters. I read on here about the RDO tweeter upgrade and tried to find some, but back in like October when I called Polk they said they wouldn’t have any til like January. Then I saw how (sorry if I butcher this) the RDO198 tweeter can be used with a crossover mod. Then I noticed there’s SO MUCH info on this forum, some of it outdated and 404ing, and I got overwhelmed so I come with this question.

What can I do to get the best out of these cabs? I love them so far
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Answers

  • Toolfan66
    Toolfan66 Posts: 17,310
    Well you can do a lot!! B)

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    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

    SVS SB16 X2

    Cary SLP-05/Ultimate Upgrade.
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    MIT Shotgun 3 cables throughout / Except TT, and PC’s
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  • Toolfan66
    Toolfan66 Posts: 17,310
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    3zjhsw1tg4u2.jpeg
    hgoja97w3lid.jpeg
    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

    SVS SB16 X2

    Cary SLP-05/Ultimate Upgrade.
    Cary SA-500.1 ES Amps
    Cary DMS 800PV Network
    OPPO UDP 205/ModWright Modification
    VPI Scout TT / Dynavector 20x2
    Jolida JD9 Fully Modified

    VPI MW-1 Cyclone RCM

    MIT Shotgun 3 cables throughout / Except TT, and PC’s
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  • F1nut
    F1nut Posts: 50,654
    edited December 2021
    https://forum.polkaudio.com/discussion/40577/sda-srs-4-1tl-upgrade

    A couple of changes to my original info. Remove the 750pF Silver Mica and do NOT replace with anything.
    Use two 20uF instead of a 10 and 30 for the 40uF.

    The link takes you to page 2. Click on page 1 to start at the beginning.
    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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  • Toolfan66
    Toolfan66 Posts: 17,310
    edited December 2021
    Tweeters RDO 198’s, Upgrade the crossovers are two most important IMO.

    Add some black hole 5, dynamat the baskets, binding posts, and internal wiring..

    Building or finding a dreadnought..

    That would be my list, if you have the funds to do all of it at one time, than balls out!! 😃

    I really wish gimpods boards were still available, they made modding the crossovers like doing paint by numbers…
    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

    SVS SB16 X2

    Cary SLP-05/Ultimate Upgrade.
    Cary SA-500.1 ES Amps
    Cary DMS 800PV Network
    OPPO UDP 205/ModWright Modification
    VPI Scout TT / Dynavector 20x2
    Jolida JD9 Fully Modified

    VPI MW-1 Cyclone RCM

    MIT Shotgun 3 cables throughout / Except TT, and PC’s
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  • satlite
    satlite Posts: 8
    F1nut wrote: »
    https://forum.polkaudio.com/discussion/40577/sda-srs-4-1tl-upgrade

    A couple of changes to my original info. Remove the 750pF Silver Mica and do NOT replace with anything.
    Use two 20uF instead of a 10 and 30 for the 40uF.

    The link takes you to page 2. Click on page 1 to start at the beginning.

    Man...$500+ for caps :o I've done recaps before but not at this cost
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  • xschop
    xschop Posts: 5,000
    Try Clarity Cap 12uf for the tweeter circuits and Daytons for the 20 and 40uf.
    Don't take experimental gene therapies from known eugenicists.
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  • F1nut
    F1nut Posts: 50,654
    satlite wrote: »
    F1nut wrote: »
    https://forum.polkaudio.com/discussion/40577/sda-srs-4-1tl-upgrade

    A couple of changes to my original info. Remove the 750pF Silver Mica and do NOT replace with anything.
    Use two 20uF instead of a 10 and 30 for the 40uF.

    The link takes you to page 2. Click on page 1 to start at the beginning.

    Man...$500+ for caps :o I've done recaps before but not at this cost

    Worth every penny.
    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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  • satlite
    satlite Posts: 8
    F1nut wrote: »
    satlite wrote: »
    F1nut wrote: »
    https://forum.polkaudio.com/discussion/40577/sda-srs-4-1tl-upgrade

    A couple of changes to my original info. Remove the 750pF Silver Mica and do NOT replace with anything.
    Use two 20uF instead of a 10 and 30 for the 40uF.

    The link takes you to page 2. Click on page 1 to start at the beginning.

    Man...$500+ for caps :o I've done recaps before but not at this cost

    Worth every penny.

    I’m sure! My budget’s just tight - I’m about to move into a new home. Might just buy a pair of caps a month at a time then do the mod once I have them all.
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  • Gardenstater
    Gardenstater Posts: 4,502
    Probably better to stash your money in a cookie jar until you have enough, because of shipping charges.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
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  • satlite
    satlite Posts: 8
    Gardenstater wrote: »
    Probably better to stash your money in a cookie jar until you have enough, because of shipping charges.

    Good point.

    If I were to do the Sonicap 5.8s and 12s, could I do cheaper Daytons for the 20s and just upgrade to Sonicap later? I have a powered sub and I'm really after this upgrade for the tweeter above all else
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  • pitdogg2
    pitdogg2 Posts: 25,576
    Many have use a lesser cap for the low pass section.
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  • RandyCroissant
    RandyCroissant Posts: 475
    Clarity PX is a good choice for the bypass caps.
    Yamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
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  • satlite
    satlite Posts: 8
    RandyCroissant wrote: »
    Clarity PX is a good choice for the bypass caps.

    Sorry, can’t seem to find schematics. Which caps are the bypass caps?
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  • satlite
    satlite Posts: 8
    Uh oh.

    This whole time I swore I had the late 80s pin/blade cabs but I double checked before ordering the RD0198s aaaaaand looks like mine are the 1986 blade/blade model with the single vertical tweeter. Thanks 2021 for making me lose my mind.

    SO, anyway, looks like the 4.1TL mod is out without finding the proper crossovers and drivers. Could I even find these components anywhere? Is there anything else I can upgrade other than change the existing caps? I can't find the RD0194 tweeters anywhere either - backordered until feb/march.

    Help!
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  • xschop
    xschop Posts: 5,000
    Wuhan silks until further notice.
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,576
    Well did you look at the XO board? Is it one board or two?
    You could still have a B/b socket and a one board XO.
    Worth a look to double check.
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  • satlite
    satlite Posts: 8
    pitdogg2 wrote: »
    Well did you look at the XO board? Is it one board or two?
    You could still have a B/b socket and a one board XO.
    Worth a look to double check.

    Yeah confirmed it’s two
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  • Toolfan66
    Toolfan66 Posts: 17,310
    Mine were the 86 version as well, I had the MW6511’s in my stash, I purchased gimpods boards, RDO-198’s, and all of the other goodies to go with them, Jesse happened to have the passives SW102’s, and off I went..

    IMO, you would be better off just upgrading them with the 194’s when available, and the crossovers. Finding parts for these seem to be getting harder and harder to get the last few years, so taking them to the later model would be a challenge. These speakers are great the way they are anyways..
    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

    SVS SB16 X2

    Cary SLP-05/Ultimate Upgrade.
    Cary SA-500.1 ES Amps
    Cary DMS 800PV Network
    OPPO UDP 205/ModWright Modification
    VPI Scout TT / Dynavector 20x2
    Jolida JD9 Fully Modified

    VPI MW-1 Cyclone RCM

    MIT Shotgun 3 cables throughout / Except TT, and PC’s
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  • satlite
    satlite Posts: 8
    Toolfan66 wrote: »
    Mine were the 86 version as well, I had the MW6511’s in my stash, I purchased gimpods boards, RDO-198’s, and all of the other goodies to go with them, Jesse happened to have the passives SW102’s, and off I went..

    IMO, you would be better off just upgrading them with the 194’s when available, and the crossovers. Finding parts for these seem to be getting harder and harder to get the last few years, so taking them to the later model would be a challenge. These speakers are great the way they are anyways..

    Fair. Guess I’ll cross my fingers that I can find some 194s in a few months and maybe just recap the existing crossovers in the meantime.
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  • pitdogg2
    pitdogg2 Posts: 25,576
    RD-0194's will be back in stock.
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  • xschop
    xschop Posts: 5,000
    pitdogg2 wrote: »
    RD-0194's will be back in stock.

    We lost some good ones in '21... Rest in peace RD0's
    Don't take experimental gene therapies from known eugenicists.
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  • lms
    lms Posts: 26
    Per westmassguy and a few others, you can do the TL mod on your 86, crs+, blade/blade, it's just not a sanctioned mod. Have I done it, nope, but I'm saving up parts to start. Its waaaaay more expensive to do because of the two boards, but one can do it in waves.
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  • VR3
    VR3 Posts: 28,755
    Wow
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • pitdogg2
    pitdogg2 Posts: 25,576
    alexhammer1 wrote: »
    This comment resembles the
    spam link removed
    approach in the world of audio equipment upgrades. The commenter purchased speakers and heard about an RDO tweeter upgrade but faced difficulties sourcing it. They explored an alternative involving the RDO198 tweeter with a crossover mod but found the forum overwhelming due to outdated information. They seek help from forum members to simplify the upgrade process, much like how paint by numbers simplifies painting for beginners.

    Reported!

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  • westmassguy
    westmassguy Posts: 6,850
    edited January 1
    You can modify the 3rd generation CRS+ and SDA 2As to accept the RD-0198. Just follow the high pass schematic section for the SDA CRS+ 1990 SL3000 Mod. Easy peasy lemon squeezy.

    Schematic for 1990 SL3000:
    https://us.v-cdn.net/5021930/uploads/attachments/1/8/5/1/1/26710.pdf

    Schematic for 1986 CRS+:
    https://us.v-cdn.net/5021930/uploads/attachments/1/8/5/1/1/26707.pdf

    Schematic for SDA-2A:
    https://us.v-cdn.net/5021930/uploads/attachments/1/8/5/1/1/26673.pdf
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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