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Thread: The walpurgis fix for buzzing and rubbing speakers!

  1. #1
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default The walpurgis fix for buzzing and rubbing speakers!

    Sometimes, a driver voicecoil may become misaligned in the magnet gap and rub against either the pole piece or outer face of the gap. If your bass driver is buzzing or has a binding coil, this may help. I've offered this advice several times and provided a remedy to a few people. I've used this trick myself successfully on occasion. Lets face it, if you have a dodgy bass driver, you have nothing to lose by trying it.

    One bass driver. I this case, an 8" KLH.




    This is the important bit. The area where the back of the cone meets the rear suspension spider (the corrugated part).




    Using a finger poked through the chassis opening, work the cone back and forth on its suspension whilst pressing it forward (across) just in front of the join with the rear spider. Do this all the way round the cone. If the coil is fouling, you will feel it rubbing. Do this as many times as it takes you to identify the point at which it rubs most.




    Once you are sure where it is rubbing most, mark this point with a felt tip pen.



    Next. Feed reasonably strong elastic bands through the speaker chassis openings and around the back of the cone so that they pull in the opposite direction to the felt tip pen mark you made on the chassis, ensuring the bands pull firmly, but not so hard as to risk causing damage and secure the bands in place using sticky tape or tying them or as I did using a paper clip.






    Then, use a hairdryer set to hot through the chassis openings and onto the rear spider all the way round. This relaxes the spider and allows the coil to move over slightly.



    Set the dryer to cold and go round the spider again. This 'sets' the new coil position.

    Remove the elastic bands and hopefully you will have a cured drive unit. Occasionally you may need to try this technique a couple of times before you get it spot on!


    Note: This will not work if the coil has been overheated and is binding due to swelled lacquer nor will it work if the coil is distorted and no longer circular.





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    Last edited by walpurgis; 07-05-2017 at 09:38.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  2. #2
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

    Default

    Made this a sticky for you Geoff. think it will be a great help for folk
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

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  3. #3
    danilo Guest

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    Clever trick indeed.. Wonder if it has permanence?
    Though in truth many would simply throw the worthless driver out.

  4. #4
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Quote Originally Posted by danilo View Post
    Wonder if it has permanence?
    From experience. It does.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  5. #5
    danilo Guest

    Default

    Worth remembering knowledge then.. thank you

  6. #6
    Join Date: Dec 2020

    Location: Liverpool, Uk

    Posts: 3
    I'm Christian.

    Default

    Hi walpurgis, I know this is incredibly unlikely but you don't have the images related to your voice coil rub fix. I'm quite a visual learner and would love to have a go at applying the fix to my audax hd 20 b 25 j woofers

  7. #7
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    I'm afraid not Christian, they are long gone since Photobucket decided to scrap their Tinypic free image site. I may add new photos sometime.

    The description in the text is easy enough to follow though, just hold a driver and visualise what I've described, you'll get the idea.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  8. #8
    Join Date: Dec 2020

    Location: Liverpool, Uk

    Posts: 3
    I'm Christian.

    Default

    I thought it was certainly worth a try I'm going to give your method a try tomorrow. Fingers crossed I'll be able to listen to these stag audio speakers as a pair finally! Thanks a lot.

  9. #9
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Let me know how you get on.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  10. #10
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 1,250
    I'm Chris.

    Default

    Quote Originally Posted by walpurgis View Post
    Let me know how you get on.
    Shame he didn't
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    Highly modified Endorphin P17 open baffle speakers containing both vintage and modern alnico drivers and paper cones. All silver wired - 8" Cube Audio FC8 full range drivers and vintage 15" Altec VOTT 416 bass drivers. All sat on Townsend Audio Podium seismic isolation platforms.
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