SDA CRS’s for Dummies

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  • Emlyn
    Emlyn Posts: 2,963
    If I had a pair of SDA 2A or 2B, I wouldn't waste time or money on the original CRS with the two tweeters per cabinet. Money's better spent on the better SDA speaker design or on a pair of Monitor 7s.
    1. Polk LSiM-707, LSiM-704C, LSiM-702FX; Dual SVS SB2000 subwoofers; Marantz SR7011 receiver; Parasound A31 and A23 amps; Oppo 205; Sony 65" 4K TV; FIOS; PS Audio Power Plant Premier; MIT S2 cables
    2. JM Labs Electra 920.1; Parasound JC2 and JC5; Sony HAP-Z1ES; Marantz SA8004 SACD; Music Hall MMF7 and Acoustech phono pre; PS Audio P1000; MIT S1 Cables
    3. Polk LSiM703; Anthem Pre-2L SE; Parasound A21; Sony 48" 4K TV; Wyred4Sound DAC 2; Oppo 203; Squeezebox Touch; PS Audio Power Director 4.7; MIT S3 cables
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  • westmassguy
    westmassguy Posts: 6,730
    edited April 2019
    There are three versions of the CRS. The original '84 CRSs were 2nd generation, two tweeters, either SL1000 or SL2000. No sub-bass drive circuit.
    '86 CRS+ were 3rd generation, single tweeter, with sub bass drive circuit. Same crossover as the SDA-2A.
    '87-'89 CRS+ were 4th generation, single tweeter, sub bass drive circuit. Same crossover as the SDA-2B.
    Most desirable '87-'89, least desirable '84.
    There would have been a 5th generation called the SRS-4.1, but Polk ceased production. The TL or SL3000 modification is the SRS-4.1 however.
    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
    Cables: Speaker: Furez 10/2 with GLS Locking Banana Plugs
    Interconnect: Furez 10/2 with SpeakONs
    ICs: Custom Furez by Douglas Connections
    Den:
    Bose 901 Series II Continentals Restored, Re-Built Equalizer with Elna Silmic IIs, Sonicaps, and Silver Mica Caps
    Carver CT-3 Pre, Carver C-500

    dhsspeakerservice.com/



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  • Dr_Wu
    Dr_Wu Posts: 214
    F1nut wrote: »
    It's not the new tweeters that make the polyswitch unnecessary. It's when the crossovers get upgraded with film caps.

    I said the new tweeters make the bypass cap unnecessary; not the polyswitch.

    Speakers: Polk SDA-CRS+ 4.1TL/Wharfedale EVO4.3; Amp: Parasound A21 Halo; Pre: NAD C165BEE; Regenerator: PS Audio PerfectWave Power Plant3; Streamer: Auralic Aries Mini/TeraDak LPS; Phono: AT LP-3/VM540Ml; CD: Onkyo C390>ProJect DAC Box S2+/TeraDak LPS; Cables: Wireworld Silver Eclipse7 speaker, High Fidelity Cables Reveal IC (pre/amp), Wireworld Silver Eclipse8 IC (streamer; DAC), Wireworld Silver Starlight digital coax (CD/DAC); Power cables: NRG Custom Cables "The Five" (regenerator; amp; streamer; DAC); Subwoofer: REL T/5i; EQ: Soundcraftsmen RP2212
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  • pitdogg2
    pitdogg2 Posts: 18,401
    edited April 2019
    ThomasD wrote: »
    F1nut wrote: »
    It's not the new tweeters that make the polyswitch unnecessary. It's when the crossovers get upgraded with film caps.

    So, I can safely just swap out the SL1000/2000 with the RD-0194's and do nothing else to the x/o's ?
    Edited
    Been reading the SDA Handbook and believe the answer to my question is 'yes'.

    Yes yes yes yes yes I answered that already.
    pitdogg2"" wrote:
    yes you can use the RD-0194 for replacement to both of those tweeters BUT the SL1000 has a differrent cut out and modifications to the holes will be needed. Although less desirable they are close and if price is right worth it as they do have a very good soundstage.
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  • F1nut
    F1nut Posts: 45,638
    Yes
    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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  • F1nut
    F1nut Posts: 45,638
    edited April 2019
    Dr_Wu wrote: »
    F1nut wrote: »
    It's not the new tweeters that make the polyswitch unnecessary. It's when the crossovers get upgraded with film caps.

    I said the new tweeters make the bypass cap unnecessary; not the polyswitch.

    You're still wrong.

    The purpose of a bypass is to improve the performance of another capacitor usually an electrolytic. When upgrading to a film cap the bypass is no longer needed as it creates unwanted artifacts.
    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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  • F1nut
    F1nut Posts: 45,638
    F1nut wrote: »
    It's not the new tweeters that make the polyswitch unnecessary. It's when the crossovers get upgraded with film caps.

    I'm still wrong too. I meant bypass cap, not polyswitch. However, Dr. Wu is still wrong about the tweeter and the bypass cap.
    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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  • ThomasD
    ThomasD Posts: 260
    Ok. Picked up the CRS's and they were in pretty good shape. Been listening to the stock SL2000's in them & they are bright. My older ears don't find them necessarily obnoxious but I'm use to the smooth sounding RD-0198's in my TL'd 7c's. Definitely not bass heavy, but with my 12' Klipsch sub they sound surprising musical and have good separation. I've been trying to order a pair of RD-0194's for the CRS's & a pair of RD-0198 for my 2a's that are being upgraded by @westmassguy. Have read about the issues with 'Polk' CS. Hoping my experience would be different because it's just an order for parts, no warranty or equipment issues and it has to be a phone call since these parts can't be ordered online. But alas, 3 days of getting a looping voicemail prompt that keeps taking me back to the same menu, talking to an actual warm body that continually transfers me to the 'Sorry, we are experiencing a higher than normal......please call back later', and leaving my phone # multiple times for a return call which never comes. I realize it's now Saturday and don't expect any response through the weekend but if nothing materializes next week is there any other avenue to pursue? May have to advertise in the classified's for a couple pairs.


    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • pitdogg2
    pitdogg2 Posts: 18,401
    Strange both times i called and left my number i was called within an hour.
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  • audioluvr
    audioluvr Posts: 3,245
    edited April 2019
    That's funny, I have heard similar issues but the few times I've called I was greeted by a live person right away. Are you calling after hours? Give me you credit card number Thomas. I'll order you a couple...
    Cambridge Audio 851N Streamer/DAC
    Belles 21A Pre modded with Mundorf Supreme caps
    B&K M200 Sonata monoblocks refreshed and upgraded
    Belles 350A Reference modded with Mundorf Supreme caps
    Polk SDA 1C's modded
    Wireworld Silver Eclipse IC's and speaker cables

    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January.

    by Dr. Sardonicus
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  • ThomasD
    ThomasD Posts: 260
    Heading back out to Denali Park tomorrow and will be out of cell/internet service for a while. Will try once more when I can and then may have to take Robert up on his offer.
    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • ThomasD
    ThomasD Posts: 260
    Update
    Tried again today. A little different this time. Completely different voice mail that I hadn't gotten before, asked me to leave a call back # and that I had a definite position in the queue for that return call. Hmmmm..... Low and behold 20 minutes later I got a call from the tech line. Briefly explained my frustration, stated what I needed and had all the tweets ordered in 5 minutes. Also, asked about the elusive MW6510 & 6503's just for grins & giggles. Apparently, Midwest Speaker Repair ( I believe that's who he said as our connection was in and out) is tooling up to manufacture accurate replacements for these and a couple other MW's. Is this information already on the forum here somewhere and I've just missed it?
    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • Dr_Wu
    Dr_Wu Posts: 214
    Does Polk not have any more RD6519-1 drivers? That is the replacement for the MW6510, I think.

    Glad to hear you are on track with the tweeters!
    Speakers: Polk SDA-CRS+ 4.1TL/Wharfedale EVO4.3; Amp: Parasound A21 Halo; Pre: NAD C165BEE; Regenerator: PS Audio PerfectWave Power Plant3; Streamer: Auralic Aries Mini/TeraDak LPS; Phono: AT LP-3/VM540Ml; CD: Onkyo C390>ProJect DAC Box S2+/TeraDak LPS; Cables: Wireworld Silver Eclipse7 speaker, High Fidelity Cables Reveal IC (pre/amp), Wireworld Silver Eclipse8 IC (streamer; DAC), Wireworld Silver Starlight digital coax (CD/DAC); Power cables: NRG Custom Cables "The Five" (regenerator; amp; streamer; DAC); Subwoofer: REL T/5i; EQ: Soundcraftsmen RP2212
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  • codycatalist
    codycatalist Posts: 2,661
    ThomasD wrote: »
    Update
    Tried again today. A little different this time. Completely different voice mail that I hadn't gotten before, asked me to leave a call back # and that I had a definite position in the queue for that return call. Hmmmm..... Low and behold 20 minutes later I got a call from the tech line. Briefly explained my frustration, stated what I needed and had all the tweets ordered in 5 minutes. Also, asked about the elusive MW6510 & 6503's just for grins & giggles. Apparently, Midwest Speaker Repair ( I believe that's who he said as our connection was in and out) is tooling up to manufacture accurate replacements for these and a couple other MW's. Is this information already on the forum here somewhere and I've just missed it?

    It has been brought up and doubt cast upon their ability to correctly deliver. We shall see...
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • ThomasD
    ThomasD Posts: 260
    Dr_Wu wrote: »
    Does Polk not have any more RD6519-1 drivers? That is the replacement for the MW6510, I think.

    Glad to hear you are on track with the tweeters!

    The gentleman I spoke to said that the 6510 replacement was discontinued recently. He didn't get any more specific than that.
    codycatalist wrote: »

    It has been brought up and doubt cast upon their ability to correctly deliver. We shall see...

    He said by July......

    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • F1nut
    F1nut Posts: 45,638
    Some fool at Sound United decided they are no longer going to support vintage products.
    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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  • ThomasD
    ThomasD Posts: 260
    F1nut wrote: »
    Some fool at Sound United decided they are no longer going to support vintage products.

    But they have a 'mission statement' and they are 'diversifying' their interests.
    May 28, 2018

    Sound United Introduces ‘Sound Start,’ An Initiative to Donate 10,000 Instruments to Children Worldwide in Partnership with VH1 Save The Music Foundation

    ;)
    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • ThomasD
    ThomasD Posts: 260
    Just received this email response from MidWest Speaker Repair:
    Hi Thomas,
    Yes, we are in the works for MW6502 and MW6503 replacements. Should be available this Sept.
    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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  • Dr_Wu
    Dr_Wu Posts: 214
    Not to speak for @DarqueKnight but I believe he tested the MW6510 v. RD6519 and found them to perform nearly identically. So, you might feel comfortable using them interchangeably if you can find one or the other, here and there. Good luck!
    Speakers: Polk SDA-CRS+ 4.1TL/Wharfedale EVO4.3; Amp: Parasound A21 Halo; Pre: NAD C165BEE; Regenerator: PS Audio PerfectWave Power Plant3; Streamer: Auralic Aries Mini/TeraDak LPS; Phono: AT LP-3/VM540Ml; CD: Onkyo C390>ProJect DAC Box S2+/TeraDak LPS; Cables: Wireworld Silver Eclipse7 speaker, High Fidelity Cables Reveal IC (pre/amp), Wireworld Silver Eclipse8 IC (streamer; DAC), Wireworld Silver Starlight digital coax (CD/DAC); Power cables: NRG Custom Cables "The Five" (regenerator; amp; streamer; DAC); Subwoofer: REL T/5i; EQ: Soundcraftsmen RP2212
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  • codycatalist
    codycatalist Posts: 2,661
    ThomasD wrote: »
    Dr_Wu wrote: »
    Does Polk not have any more RD6519-1 drivers? That is the replacement for the MW6510, I think.

    Glad to hear you are on track with the tweeters!

    The gentleman I spoke to said that the 6510 replacement was discontinued recently. He didn't get any more specific than that.
    codycatalist wrote: »

    It has been brought up and doubt cast upon their ability to correctly deliver. We shall see...

    He said by July......

    This is not my experience but a seasoned member was doubtful that they would reproduce them correctly. Only time and some money to test will tell.
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • DarqueKnight
    DarqueKnight Posts: 6,645
    F1nut wrote: »
    Some fool at Sound United decided they are no longer going to support vintage products.

    We all knew this day would eventually come. That's why some of us have boxes of spare drivers and tweeters stashed.

    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
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  • xschop
    xschop Posts: 2,022
    DarqueKnight wrote: »
    F1nut wrote: »
    Some fool at Sound United decided they are no longer going to support vintage products.

    We all knew this day would eventually come. That's why some of us have boxes of spare drivers and tweeters stashed.

    O Hecho en Mexico....

    kwqb1pya8vxv.jpg
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  • ThomasD
    ThomasD Posts: 260
    Alright, had a couple days home and have been pushing the CRS’s with some 200 watts of Carver power. They do seem to soak up more watts than the 2A’s but for 30+ year old, untouched SDA’s they are great. Have them set up fairly high to really listen to the SL2000,s before I disconnect the SDA tweeter & replace the stereo tweet with the RD-0194’s. Seemingly pretty good sound stage with just a little less separation than my stock 2A’s. Bass is definitely a little lacking by themselves but with a 12” sub to make it up they slam pretty well. Granted my hearing after 40+ some years of construction is not what it use to be but what is the ‘SDA wonkiness’ that many describe with the SDA tweet connected in these CRS’s? I’m not really hearing any difference with the SDA tweet connected or disconnected. Any suggested sound track that might make it more discernible?
    Carver M4.0t, M1.0t, M200t, TX2, C1, C2, Marantz 2230, 2010, 4070, 1030, APPJ 2013, Rega Brio, Marantz Imperial 7's, Klipsch Heresy III, Quartets, KG4's, KG1's, 'The Sixes', R-12SW, Polk SDA 2a's, Monitor 7cTL's, SDA CRS's, 4a's, Zu Audio Dirty Weekends, Pro-ject Acryl TT, Cambridge 851N, 351C, Panamax 5300PM
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