The Tale Of 5 Tweeters - SDA Tweeter Replacement Guide

124»

Comments

  • xschop
    xschop Posts: 2,020
    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.

    What do you think about these specs? It is a Peerless/Vifa treated silk dome that is also used in Dali speakers.

    I ask, because I've listened to these in another DIY build. They are inexpensive, Beautiful, crystal clear and I know they fit the SL1000 cutouts. I would build billet SL1000 replacement adapter plates for them. As an aside, It is interesting that they share the same magnet bolt pattern as 194/198's

    7dchfuhzvh0v.png
  • Just wanted to say thank you. Thank u very much(elvis). Because I had to choose between 194 and 198s when I redid my XO and overhaul and I knew it had to be one or the other. This confirms they are both good. And it I didnt have any analysis to go buy really. I just picked up the consensus from good postings here. And for me it seemed the 198s were what was going to work for my ears the most. This data is much appreciated as supporting evidence and my ears dont fail me. Thanks all for a great place on the web and the ideal setup Im content with.
    Cool stuff: Adcom GFA-555, GFP-710, Oppo BDP-83, Monitor 10's w/RDO198s, rebuilt and modded XO: Sonicap/Mundorf topside, Daytons Low.
    Benq W5000

    "Leaning back like a maxwell tape commercial listening to pure polk bliss"
  • Gardenstater
    Gardenstater Posts: 1,992
    edited August 2020
    I know the Peerless tweeters were not in any SDA speakers and therefore not pertaining to the title of the thread but I though this was interesting from an eBay seller who measured some NOS Peerless tweeters he is selling (Peerless K010DT 810665 Silk Dome Tweeter):

    PS: It seems to have an average impedance (2kHz and above) of around 9.5 Ohms, whereas the SL1000 was around 7.25 Ohms. The SL1000 has been said to have been the warranty replacement that Polk used for the Peerless, perhaps when they severed their relationship and no longer used Peerless tweeters. I know there is more to determining if two tweeters are compatible in frequency response but it makes me wonder. The other Thiele Parameters are quite different.

    c6smrj41xzj6.png
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • Gardenstater
    Gardenstater Posts: 1,992
    Looks like a factory Dimensions Drawing (posted by eBay seller):

    49lmv83wcwtu.png
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • xschop
    xschop Posts: 2,020
    When I get time next week, I'll dissect, compare domes, then rebuild a set of these Peerless with the aftermarket silk domes.
  • xschop
    xschop Posts: 2,020
    edited January 4
    The SL2500 dome material looks just like the same material used on Polk's SL5000 "dynamic balance" tweeters...
    The magnet bolt pattern fits the SL2000 pattern, not RDO.

    vwloxvvlgrxp.jpg

  • Wow! Thank God for this article.

    I have had a pair of Polk RTA11 TLs for years. I thought something sounded a little off. I never could figure it out until now.

    I usualy listen to music in the background when I am doing something else but, once in a while I just put on an album and really listen to it. It was during those few and far between sessions that I would notice something. The stereo image was a little off maybe.

    I thought it might be my imagination. I thought it might be a blown speaker element. I did all kinds of fequency tests through the speakers. Both speakers were able to recreate all frequencies. I did touch and listen tests to all of the speaker elements. There was no blown element.

    All the speakers were fine yet, they definitely sounded different. Seemed like the problem area was with the high frequencies. Years ago, I noticed that one of the tweeters was silver and one of the tweeters was black. I didn't think about that for many years.

    Finaly, I took the grills off and unscrewed the tweeters. One tweeter was an SL2500 and the other was an SL3000. They were clearly marked.

    I'm not really sure why there are different tweetersin my speakers. I bought them from a local hi-fi store that has gone out of business since the 90s. Were they damaged in the store and repaired? Did Polk run out of SL3000s on the day they made my speaker?

    Has anyone else seen an SL2500 inside an RTA 11TL?

    So, I went ahead and ordered a pair of RD-0198s. That should fix the problem.

    I just wanted to let you know how much I appreciate the time and effort that you put into this article. I will let you know how my new RD-0198s turn out.

    Thanks so much.
  • F1nut
    F1nut Posts: 46,118
    Polk didn't put the SL2500 in your speaker.
    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

  • BlueBirdMusic
    BlueBirdMusic Registered User Posts: 1,549
    @chargingBull:

    Welcome to the Forum. Stay and you will have a lot of fun.

    For your first post, it was interesting.
    Remember at least 2,448 heroes +13 on 08/26/2021
    LIFE has to be LIVED
    “A sad soul can be just as lethal as a germ.” – John Steinbeck
    You Can't Resist Propaganda if You Can't Recognize It
    If the telephone doesn't ring ......... it's me
    Harry / Marietta Georgia

  • Lucid1
    Lucid1 Posts: 1
    Long time Polk fan but new to this forum. I've finally taken the dive into "fixing" my vintage speakers so I'm still learning what I need to know and this post along with the subsequent comments was exactly what I was looking for regarding my tweeter options - thanks for the education!!
  • F1nut
    F1nut Posts: 46,118
    Welcome to Club Polk.
    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