Cs400i tweeter rebuild

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I recently lost all sound from my tweeter on my center channel. I direct wired the tweeter from an audio source and got no sound at all. I have recently replaced the tweeter with a used one but is there a way to rebuild the old one for a spare. I see there are replacement diaphragms available but I cannot see any damage to the one I removed. It is a sl6506. I removed the diaphragm and there is no obvious short or bad wire.

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  • xschop
    xschop Posts: 4,833
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    Did you check it with an ohm meter?
    Don't take experimental gene therapies from known eugenicists.
  • ChrisD06
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    stewdog09 wrote: »
    I recently lost all sound from my tweeter on my center channel. I direct wired the tweeter from an audio source and got no sound at all. I have recently replaced the tweeter with a used one but is there a way to rebuild the old one for a spare. I see there are replacement diaphragms available but I cannot see any damage to the one I removed. It is a sl6506. I removed the diaphragm and there is no obvious short or bad wire.

    Well hooking it up directly to an audio source is a phenomenal way to fry the tweeter if it was fine to begin with.

    Otherwise, it was probably dead from the get-go. You CAN order the wuhan diaphragm from Ebay and replace it but it's tedious and not worth it.
  • stewdog09
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    I have not checked resistance but that will be my next step, and have you done it Chris? Or know of anyone who has and produced poor results? That's the real question I am asking. The tweeter was clearly bad if the used one I replaced it with works fine with the same crossover.
  • ChrisD06
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    stewdog09 wrote: »
    I have not checked resistance but that will be my next step, and have you done it Chris? Or know of anyone who has and produced poor results? That's the real question I am asking. The tweeter was clearly bad if the used one I replaced it with works fine with the same crossover.

    No I have not done it, but I'll tell you the SL6506 diaphragm is glued in quite strongly, and you'll need to replace the ferrofluid, clean the old glue, possibly replace the foam behind the diaphragm which falls apart after some years, and then the new diaphragm might need to have it's edges cut down PLUS you have to align it perfectly to prevent the coil from rubbing against the magnet.

    It's just not worth the time and effort in my opinion. It also would sound much different as the diaphragm wouldn't be made to Polk's specifications and it's a silk dome, not a tri-laminate. If you really wanted to have a fun project you could try a rebuild.
  • stewdog09
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    It may be a future project for a backup, the foam indeed was disintegrated and the timbre was the only reason I chose this center channel to match my 1.2tl and rta11tl. Hopefully if I blow another in coming years I can still find another 6506
  • ChrisD06
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    stewdog09 wrote: »
    It may be a future project for a backup, the foam indeed was disintegrated and the timbre was the only reason I chose this center channel to match my 1.2tl and rta11tl. Hopefully if I blow another in coming years I can still find another 6506

    No need to even buy a used SL6506 anyways to tell you the truth. Polk sells the RD2516-1 with is a vastly superior tweeter, it's quite expensive though but well worth the cost, it also handles more power.
  • stewdog09
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    Would the rd2516-1 be a close match to my rd0198's? Would I have to alter the crossover?
  • ChrisD06
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    stewdog09 wrote: »
    Would the rd2516-1 be a close match to my rd0198's? Would I have to alter the crossover?

    No, it's a direct replacement to the SL6506.