The Tale Of 5 Tweeters - SDA Tweeter Replacement Guide

13

Comments

  • DarqueKnight
    DarqueKnight Posts: 6,640
    edited August 2018
    mhardy6647 wrote: »
    Do you have any reference tweeters that are different than this cadre to test?

    I have tested several copies of each tweeter, including brand new copies of the RD0194 and RD0198, and the 5 kHz dip still appears.
    mhardy6647 wrote: »
    I wonder if 5-ish kHz dip is endemic to these tweeters or an artifact of the test.

    I wondered about that. Moving the microphone closer or farther away did not get rid of the 5 kHz dip. The FR plot below is of my SDA SRS 1.2TLs in the same room. There is a small dip in the response at 5 kHz, but nothing close to what is shown in the tweeter response plots.

    vu6tdoje77l1.jpg
    Figure 19. Room response of SDA SRS 1.2TLs in tweeter testing room.

    The SDA CRS+s in my office at work do show a dip at 3.5 kHz and at 5 kHz.

    pcq2hqv5px2x.jpg
    Figure 20. Room response of SDA CRS+s in office at work.

    I did a search on "tweeter dip at 5 kHz" and found that some speakers have a dip at 5 kHz to improve the smoothness and midrange "presence" of the speaker.

    @KennethSwauger would you ask Stu if these tweeters are supposed to have a dip at 5 kHz?
    "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    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically...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
  • DarqueKnight
    DarqueKnight Posts: 6,640
    Near Field Measurements Redone - 5 kHz Dip Gone!

    After further study and experimentation, the previous near-field frequency response measurements were redone. The previous measurements were taken at a distance of 9 inches. The new measurements were taken at a distance of 2 inches, with the microphone pointing at the exact center of the tweeter dome.

    The following quote is taken from a white paper by Jeff Bagby, "How to Achieve Accurate In-Room Quasi-Anechoic Free-Field Frequency Response Measurements Down to 10 Hz":

    "To begin with we need to understand what a far-field response really is. To be in the far-field is not as far as you may think. You are effectively in the far-field when your microphone is at a distance that is 3-5 times the radiating diameter of the driver."

    Therefore, for a near field measurement for a 1" tweeter, the microphone should have been no further than 3 to 5 inches away. At the prior 9 inch microphone distance, room effects were coming into play.

    Also from Bagby, "...the usable upper limit of the near field response is defined as
    Fmax = 4311/ radiating diameter (in inches). Below this frequency the near-field response will be accurate and free of room and cabinet diffraction effects, above this frequency the near-field data is less reliable and less accurate."

    Another rule for near-field measurement is that the microphone needs to be spaced from the center of the driver approximately 0.10 times the effective radiating radius of the driver. In the case of a 1" tweeter, this distance would have been 1/20th (0.05"). This was impractical in my case due to reflections from the tripod holding the microphone. A distance of 2 inches from the center of the tweeter domes resulted in smooth response curves without any dips due to room effects.

    SDA Tweeter Frequency Response Measurements - Two Inch Distance

    brcju26nuqbb.jpg
    Figure 21. SL1000 frequency response.

    cp9se4gtvpus.jpg
    Figure 22. SL2000 frequency response.

    cei3g9y04ekk.jpg
    Figure 23. SL2500 frequency response.

    t9vs3zrtw649.jpg
    Figure 24. SL3000 frequency response.

    o67psath9xat.jpg
    Figure 25. RD0194 frequency response.

    tadaoplqydbf.jpg
    Figure 26. RD0198 frequency response.

    ms13ibtdu6cq.jpg
    Figure 27. Composite plot of all six tweeters. Black line: RD0194. Red line: RD0198. Light blue line: SL1000. Green line: SL2000. Purple line: SL2500. Dark blue line: SL3000.

    hmrgj4vm2yt3.jpg
    Figure 28. Comparison of RD0194 and SL2000 frequency response.

    newhd2c9c4oh.jpg
    Figure 29. Comparison of RD0194 and SL1000 frequency response.

    64eo8qhpqq27.jpg
    Figure 30. Comparison of RD0198 and SL2500 frequency response.

    2o46ozckl5q9.jpg
    Figure 31. Comparison of RD0198 and SL3000 frequency response.

    SDA Tweeter Harmonic Distortion Analysis - Two Inch Distance

    In order of least harmonic distortion to most, the tweeters are: RD0198, RD0194, SL3000, SL1000, SL2500, SL2000.

    The legend for the harmonic distortion plots is as follows:

    Black line at top - frequency response.
    Dark blue line second from top - summation of 2nd - 5th harmonics.
    Light blue line - 5th harmonic.
    Green line - 4th harmonic.
    Purple line - 3rd harmonic.
    Red line - 2nd harmonic.

    ao1jorgh1cwo.jpg
    Figure 32. SL1000 harmonic distortion analysis.

    c8n0n51i4ghs.jpg
    Figure 33. SL2000 harmonic distortion analysis.

    7u1djacwamks.jpg
    Figure 34. SL2500 harmonic distortion analysis.

    c8g0cerh2cpt.jpg
    Figure 35. SL3000 harmonic distortion analysis.

    4jibxdzfmp8c.jpg
    Figure 36. RD0194 harmonic distortion analysis.

    wfojef0u16nl.jpg
    Figure 37. RD0198 harmonic distortion analysis.

    References

    1. Jeff Bagby, "How to Achieve Accurate In-Room Quasi-Anechoic Free-Field Frequency Response Measurements Down to 10 Hz", white paper, January 3, 2014, presented at Loudspeaker Design Workshop”, Kokomo, IN, December 14, 2013.

    2. Christopher J. Struck, Steve F. Temme, " Simulated Free Field Measurements", Journal of the Audio Engineering Society, Vol. 42, No.6, June 1994.

    3. Michael LaLena, "Speaker Testing and Analysis", https://www.diyaudioandvideo.com/Tutorial/SpeakerResponseTesting/
    "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
  • DarqueKnight
    DarqueKnight Posts: 6,640
    edited August 2018
    SDA Tweeter Rankings

    Throughout the years it has been said that the SL2000 was the worst performing/worst sounding of the SDA tweeters. The quantitative measurements and physical inspections done in this study seem to support that. The SL2000 rated at the bottom in terms of build quality, balanced frequency response, and harmonic distortion among the six tweeters tested.

    Build Quality

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL2500
    5. SL1000
    6. SL2000

    Frequency Response

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL2500
    5. SL1000
    6. SL2000

    Harmonic Distortion

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL1000
    5. SL2500
    6. SL2000
    "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
  • K_M
    K_M Posts: 1,602
    SDA Tweeter Rankings

    Throughout the years it has been said that the SL2000 was the worst performing/worst sounding of the SDA tweeters. The quantitative measurements and physical inspections done in this study seem to support that. The SL2000 rated at the bottom in terms of build quality, balanced frequency response, and harmonic distortion among the six tweeters tested.

    Build Quality

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL2500
    5. SL1000
    6. SL2000

    Frequency Response

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL2500
    5. SL1000
    6. SL2000

    Harmonic Distortion

    1. RD0198
    2. RD0194
    3. SL3000
    4. SL1000
    5. SL2500
    6. SL2000

    Sounds about right.
    By the way, did you ever get around to doing the Frequency Response of the MW mentioned earlier??
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
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  • DarqueKnight
    DarqueKnight Posts: 6,640
    No.
    "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
  • K_M
    K_M Posts: 1,602
    edited January 2019
    Tony M wrote: »

    I said I've heard over the years there was a rise in amplitude around the 5khz. region.
    Is my memory wrong about the all the discussions about why the SL2000 sounds so bad most of the time?

    The 5Khz region is where I was concentrating my curiosity at in the graphs. As you can see and.

    Prior to your comment, I had never heard any mention of an amplitude rise in the 5 kHz region. All the discussions I know about were concerning the 5 dB rise in the 13 kHz region.

    With the tweeters mounted in "Free Space" with no speaker baffle, you are seeing the effects of Baffle edge diffraction taking place at a higher frequency, than when mounted in the speaker.

    http://www.linkwitzlab.com/diffraction.htm
    http://ampslab.com/blog/2017/09/06/dome-tweeters/

    The small dimensions of the face plate create a ripple effect when frequencies are a wavelength of the dimensions radiating from the tweeter dome.

    In this case, it is approximately 4.5" wide, and there for a null around approximetly 5000hz and a resultant rise at about 10khz and about 2.5 khz.

    Since the height dimension is smaller, diffraction will occur at a different frequency and help mask some of the ripple of up and down levels with rising frequency.

    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
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  • Thank you for this article. After 31 years, I updated my SDA2A's SL2000 tweeters to the RDO194-1 from Midwest Speaker Repair. I did not do any before and after critical listening but I swear they sound like a new pair of speakers. I had thought about buying new speakers and that perhaps mine were just old but this simple and inexpensive update brought them back to life. Thanks!
    Polk Audio SDA-2A, Carver M1.0, Carver C2, Sony CD player.
  • geppy1
    geppy1 Posts: 3,005
    Great stuff I never really had much of a problem with the SL 1000
  • gp4jesus
    gp4jesus Posts: 1,706
    edited June 2019
    Do my eyes deceive me or does the RD0 194 frame separate cleanly from the tweeter allowing mounting in a RD0 690(RTi A series) frame?

    Thnx Tony
    Samsung 60" UN60ES6100 LED
    Outlaw Audio 976 Pre/Pro
    Samsung BDP, Dish Rcvr, Phillips CD chgr, various game consoles

    Canare 14 ga - LCR tweeters inside* & CC outside
    BJC 10 ga - LCR mids, inside* & out
    8 ga Powerline - LR woofers, inside* & out
    *soldered

    LR: Tri-amped RTi A7 w/Rotels. Woofers - 980BX; Mids & Tweets- 981
    CC: Rotel RB981 -> Bi-amped CSi A6
    5 Subs: Sunfire True Sub Signature -> LFE & CC & 4 Audio Pro Evidence Subs
    Surrounds: Rotel 981 -> AR 12 ga -> RTi A3
    Power Conditioning & Distribution:
    3 dedicated 20A feeds; APC H15; 4 Furman Miniport 20s
  • DarqueKnight
    DarqueKnight Posts: 6,640
    The RD0194 tweeter can be taken out of its frame. I do not know it can be mounted in an RD0690 frame, or if doing so would compromise the 194's performance.
    "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
  • gp4jesus
    gp4jesus Posts: 1,706
    edited June 2019
    1000 thanks for your thorough research.
    The RD0194 tweeter can be taken out of its frame.
    Great! Thnx for the quick reply.
    I do not know it can be mounted in an RD0690 frame...
    likely. Several years ago someone on this forum successfully replaced a ‘690* w/an aftermarket ring tweeter** similar to a Polk 700 series speaker - LOVED the results!
    * RTi A9s
    ** XO upgrades didn’t “do it” for him
    ...or if doing so would compromise the 194's performance.
    possibly - thanks for the cautionary advice.

    Tony
    Samsung 60" UN60ES6100 LED
    Outlaw Audio 976 Pre/Pro
    Samsung BDP, Dish Rcvr, Phillips CD chgr, various game consoles

    Canare 14 ga - LCR tweeters inside* & CC outside
    BJC 10 ga - LCR mids, inside* & out
    8 ga Powerline - LR woofers, inside* & out
    *soldered

    LR: Tri-amped RTi A7 w/Rotels. Woofers - 980BX; Mids & Tweets- 981
    CC: Rotel RB981 -> Bi-amped CSi A6
    5 Subs: Sunfire True Sub Signature -> LFE & CC & 4 Audio Pro Evidence Subs
    Surrounds: Rotel 981 -> AR 12 ga -> RTi A3
    Power Conditioning & Distribution:
    3 dedicated 20A feeds; APC H15; 4 Furman Miniport 20s
  • gp4jesus
    gp4jesus Posts: 1,706
    194s in any RTi A series speaker is a nice idea and will remain just that - 194s are anything BUT a drop in.

    A comparison of your 194 photos to a 690’s physical etc, measurements demands MAJOR surgery to the closure primarily due to ~twice the magnet diameter* among other things - *sigh*
    * 690 series ~1”

    Thanks DK

    Tony
    Samsung 60" UN60ES6100 LED
    Outlaw Audio 976 Pre/Pro
    Samsung BDP, Dish Rcvr, Phillips CD chgr, various game consoles

    Canare 14 ga - LCR tweeters inside* & CC outside
    BJC 10 ga - LCR mids, inside* & out
    8 ga Powerline - LR woofers, inside* & out
    *soldered

    LR: Tri-amped RTi A7 w/Rotels. Woofers - 980BX; Mids & Tweets- 981
    CC: Rotel RB981 -> Bi-amped CSi A6
    5 Subs: Sunfire True Sub Signature -> LFE & CC & 4 Audio Pro Evidence Subs
    Surrounds: Rotel 981 -> AR 12 ga -> RTi A3
    Power Conditioning & Distribution:
    3 dedicated 20A feeds; APC H15; 4 Furman Miniport 20s
  • K_M
    K_M Posts: 1,602
    edited January 2020
    26snu4htcowv.jpg
    Posted the SL-2000 response (as measured by member D-K)
    But after closer examination, realized this is not really showing any peak at all, but simply a slightly rising response of about 2 db at around 12-14 khz.

    What "smoothing" was used to generate the plots?

    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
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  • F1nut
    F1nut Posts: 46,118
    From the November 1987 issue of Stereo Review,

    "We noted with interest that the 5-dB tweeter resonance peak at 13,000 Hz that we found in the earlier version was again present in the SDA-1c."
    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

  • K_M
    K_M Posts: 1,602
    F1nut wrote: »
    From the November 1987 issue of Stereo Review,

    "We noted with interest that the 5-dB tweeter resonance peak at 13,000 Hz that we found in the earlier version was again present in the SDA-1c."

    h6d7awwoeo4n.jpg

    I get there is a peak, (from the rta11t, stereophile) but D-K's response curves appear to have a lot of smoothing applied was all.
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
    B+W-Sold
    Electro Voice EV-SIX
    Infinity-Sold
    Advent-Now gone
    Yamaha A-S801
    Yamaha RX-V377
    Yamaha RX-A860
    Yamaha RX-A3060
    Harman Kardon Hk-350i
    Harman Kardon Hk-........
    Harman Kardon PM-665
    Harman Kardon HK-775
    Pioneer.......Stereo Receiver

  • westmassguy
    westmassguy Posts: 6,746
    edited January 2020
    deleted
    Post edited by westmassguy on
    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/



  • 2 years ago I bought a mint pair of 1989 RTA 8Ts. I wanted, and still do, a pair of RTA 12(B), but don’t have the room.

    The 8Ts use the same 6501 MW as the 12s. So, I get similar sound as the 12s.

    After listening to my stock 8Ts, the original tweeters, SL2000, have a coloration that sounds like crumpled Mylar potato chip bags when reproducing scratches on records. I bought a pair of 0194 tweeters and replaced the SL2000s. Very smooth and detailed, no coloration.

    2 weeks ago I bought a pair of 1984 SL1000 Peerless silk dome tweeters; price of $30 was too good to pass up! Near mint condition, taken from the RTA 12Bs.

    I put those in, in place of the 0194 tweets.

    Just my preference, but I like the Peerless more than the 0194 units!

    But none of this comparison would have been possible without DK’s work and others who contributed! I would not have known what to substitute, nor what to expect!

    This work is unparalleled in its excellence any where else!

    Choices are a very good thing! I love Polk speakers, have since first hearing the RTA 12s in 1980!

    Kudos for those in here keeping it real and factual!

    I bow to the greatness.......
    Invention is the mother of necessity.

    "The Vintage Square":

    Polk RTA 8T (1988, new to me 2018), Peerless+MB Quart DIY (1992), Velodyne DLS 3500R (2005)

    Dynaudio DIY tower 1994: Dual 28 mm soft dome tweeters, dual 9" woofers, custom equal-compromise 2nd order CO, 1.35 cu ft enclosure

    Denon DP45-F (1981), JVC QL Y5F (1980), ADC XLM MKIII (1982), Shure V15V (1982)

    Sherwood S9600-CP (1981)

    Aiwa ADF 780 Cassette (1988)

    Custom DIY dual monoblock 235 w/ch IGBT output power amplifiers

  • F1nut
    F1nut Posts: 46,118
    The Peerless are entirely the wrong tweeter for your speakers.
    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

  • xschop
    xschop Posts: 2,020
    Question for DarqueKnight, Is there an aftermarket 1" silk dome tweeter that you believe would be a good replacement or substitute for the RD0198 if it were mated properly to the RD0194/198 frame plate?
    Thank you again for all your research.
  • DarqueKnight
    DarqueKnight Posts: 6,640
    If there is, I don't know of it. Some insight is to be gained by Polk having to re-engineer replacements for the SL2000 and SL3000 tweeters. I don't think it's that easy to find off-the-shelf tweeters that are close in performance and electrical characteristics to the originals.
    "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
  • DOTK
    DOTK Posts: 4
    New guy here with another ?? for DarqueKnight

    I have a pair of 1984 CRS with the SL1000. Bought a pair of the RDO194 from Midwest to replace the two I have running (sda tweeter pair fuses pulled). Seems past installs have modified the base of the RDO194s or enlarged the mounting hole/template on the speaker face. Looking at the 4 mounting screws for each to their mounting plates the spacing looks similar.

    Could I just remove the old drivers from the SL1000 mounting plates and screw on the drivers from the RDO194 onto the SL1000 plates? Would keep from having to modify plates or speaker face?

    Great work on your part...many thanks!
  • pitdogg2
    pitdogg2 Posts: 19,236
    DOTK wrote: »
    Could I just remove the old drivers from the SL1000 mounting plates and screw on the drivers from the RDO194 onto the SL1000 plates? Would keep from having to modify plates or speaker face?

    Great work on your part...many thanks!

    If I'm understanding correctly NO you cannot switch the front tweeter face plates. The SL1000 tweeters have the dome and glued on the face plate. The connection points are also different for the wires. The new RD-0194 tweeters will need to have the old hole modified a little to keep the speaker front bezel from forcing the connection leads into the magnet assembly on the RD-0194. The screw holes are also off just a little.

  • DarqueKnight
    DarqueKnight Posts: 6,640
    pitdogg2 wrote: »
    DOTK wrote: »
    Could I just remove the old drivers from the SL1000 mounting plates and screw on the drivers from the RDO194 onto the SL1000 plates? Would keep from having to modify plates or speaker face?

    Great work on your part...many thanks!

    If I'm understanding correctly NO you cannot switch the front tweeter face plates.

    You are understanding correctly.

    "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
  • Dr_Wu
    Dr_Wu Posts: 240
    edited April 2020
    I was able to trim the flange from the RD0194 face plate (it's plastic), using a Dremel cutting wheel; taking care to protect the screw holes, then smoothing the cut edges. The face plate then fit within the old cut-outs and mounted flush to the baffle. I didn't experience a difference in screw hole location.
    Speakers: Wharfedale EVO4.3; Amp: Parasound A21 Halo; Pre: NAD C165BEE; Regenerator: PS Audio PerfectWave Power Plant3; Streamer: Auralic Aries Mini/TeraDak LPS>Chord Qutest DAC/TeraDak LPS; CD: Onkyo C390 changer>Chord Qutest DAC; Phono: AT LP-3/VM540Ml; Cables: Wireworld Silver Eclipse7 speaker, High Fidelity Cables Reveal IC (pre/amp), Wireworld Silver Eclipse8 IC (DAC/pre), Wireworld Silver Starlight digital coax (CD/DAC), AQ Carbon USB (streamer/DAC); Power cables: NRG Custom Cables "The Five" (regenerator; amp; streamer; DAC); Subwoofer: REL T/5i; EQ: Soundcraftsmen RP2212
  • xschop
    xschop Posts: 2,020
    Dr_Wu wrote: »
    I was able to trim the flange from the RD0194 face plate (it's plastic), using a Dremel cutting wheel; taking care to protect the screw holes, then smoothing the cut edges. The face plate then fit within the old cut-outs and mounted flush to the baffle. I didn't experience a difference in screw hole location.

    Diddo. I've done the same just to see if they fit the factory 5jr baffle. Afterwards you can simply fill in the old SL1000 baffle mount holes with wood glue, let dry, then redrill for RD0194 holes.
  • DOTK
    DOTK Posts: 4
    Thanks all for the replies! Think i'll get out the Dremel and follow Dr Wu's lead.

    Next question is where can I get the info on recapping/rebuilding the Gen 2 original CRS "2 board" crossovers? Have searched but cant find it yet?
  • xschop
    xschop Posts: 2,020
    A 6" table belt sander makes very quick work of the mod.
  • Dr_Wu
    Dr_Wu Posts: 240
    That would have been nice to have!
    Speakers: Wharfedale EVO4.3; Amp: Parasound A21 Halo; Pre: NAD C165BEE; Regenerator: PS Audio PerfectWave Power Plant3; Streamer: Auralic Aries Mini/TeraDak LPS>Chord Qutest DAC/TeraDak LPS; CD: Onkyo C390 changer>Chord Qutest DAC; Phono: AT LP-3/VM540Ml; Cables: Wireworld Silver Eclipse7 speaker, High Fidelity Cables Reveal IC (pre/amp), Wireworld Silver Eclipse8 IC (DAC/pre), Wireworld Silver Starlight digital coax (CD/DAC), AQ Carbon USB (streamer/DAC); Power cables: NRG Custom Cables "The Five" (regenerator; amp; streamer; DAC); Subwoofer: REL T/5i; EQ: Soundcraftsmen RP2212
  • DarqueKnight
    DarqueKnight Posts: 6,640
    DOTK wrote: »

    Next question is where can I get the info on recapping/rebuilding the Gen 2 original CRS "2 board" crossovers? Have searched but cant find it yet?

    Here is the schematic:

    https://us.v-cdn.net/5021930/uploads/attachments/1/8/5/1/1/26679.pdf
    "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