New to this forum. I recently purchased a pair of SDA 1Cs. The 6.5" inch drivers on the right channel need to be replaced. I have learned that it is difficult to find the MW 6510 and MW 6511 and (it appears) the "replacement" MW 6503. Is there a source for these?


  • westmassguywestmassguy Posts: 6,068
    Call Polk Customer Service 1.800.377.POLK (7655) Option 1
    Be sure to tell them you're a Club Polk member.
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  • mlistens03mlistens03 Posts: 1,405
    edited August 2
    What is wrong with the drivers? The magnets may have slipped, which is a time consuming but fixable problem.
    Also, I don’t think that the MW6503 is a suitable replacement for the MW6510/MW6511, but I’d let others pitch in on that front before you make any conclusions on them not being compatible. I’m still new to the SDA line.
    I also think that Polk still manufactures replacement drivers for these speakers, but I think they are different enough that you will need to replace all of the drivers in the left and right speakers, unfortunately.
    And welcome to CP!
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  • NothusNothus Posts: 4
    No sound comes from the drivers. They make scratching sounds when gently pushed by hand. The drivers on the left speaker produce sound and make no noise when pushed or doing the leak check by pushing the passive. I pulled one driver and ohm'd it out Fluke DMM read OPEN.
  • pitdogg2pitdogg2 Posts: 10,242
    Slipped magnets.

    Call polk or take your chance buying used OEM off eBay. Be sure to cut a relief where the screws go or you will tear the rubber and ruin a new speaker. Believe us even if it doesn't appear to damage the rubber surround, It will and it will ruin the driver. Many have learned the hard way.
  • FestYboyFestYboy Posts: 2,530
    Slipped magnets can be repaired. I did a write up somewhere 'round here showing part numbers, supplies and how to build a jig. It's a 2 day process only because the adhesive needs to set 24 hrs. Otherwise it would take 10-20 min per driver.
  • NothusNothus Posts: 4
    Okay, are the magnets actually loose or do they loosen and then the adhesive reseals the out of position. Also what are the symptoms of a shifted magnet?
  • F1nutF1nut Posts: 39,993
    The magnets generally shift, but sometimes they fall off. The scratching sound you heard is an excellent indication, but not always. If you didn't apply even pressure around the driver as you pushed in it will make a scratching sound. Just pull the drivers in question and look at the back, it'll be bloody obvious if shifted and no, the adhesive does not re-adhere.
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  • NothusNothus Posts: 4
  • la2vegasla2vegas Posts: 2,632
    One of the members here fixes shifted magnets free of charge. All you have to do is pay for shipping to and from. Reach out to him, he's @lawdogg.
    2.3TL, 3.1TL, SDA 2B, SDA II, 7B, 7C, 7 series 2, 10B, 5JR+, 5JR, 5A, 4.5, 4, RTA 11T X2 pairs, RTA 8T, LSI9, LSI7, RTI A7, RTI A3, CSI A4, CSI A6, F/XI A4, RTI4. That's all for now.
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