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Naim SBL damping foam - replacing

Discussion in 'd.i.y.' started by chrisn, May 18, 2021.

  1. chrisn

    chrisn pfm Member

    Put an new main driver in one of my old SBL mid boxes. Expensive from Simon Hamnett but there you go I'm happy.
    The damping foam was dust. Fortunately one of the speakers had a sheet good enough for a copy template.
    I ordered some ready made from a dodgy Chinese site for 50$, fortunately Paypal refunded me.
    Guy at Puresound sells them too and is reputable and responsive but I had already decided to diy.

    I bought some 1/2 inch acoustic foam, with careful tessalation one sheet does twelve rhomboids, you need three rhomboids per box.
    They fit in as in the pictures tucked behind the top metal plate and pushed in to leave the diffuser at the bottom clear.
    Hylomar Blue off ebay to seal, torque up bolts to the suggested Nm and there you go.
    The usual faff sealing and setting up.
    Sound great, but better, don't know.
  2. say it as it is

    say it as it is pfm Member

    i must have been lucky when i took the drivers out of mine the foam looked ok and was still there in place.

    how much did new drivers cost you then?
  3. garyi

    garyi leave blank

    I seem to recall it was a funny hair type material in my SBLs?
  4. say it as it is

    say it as it is pfm Member

    in the main body yes was it not the shaped foam pieces in the driver cabinet ?
  5. colasblue

    colasblue pfm Member

    Definitely foam in the sealed box elements on any pair I've had.

    I've never heard of it deteriorating before so this must be a new issue. I suppose its inevitable since the foam on the grills is probably the same stuff and that certainly deteriorates.
  6. Calamity Jack

    Calamity Jack New Member

    Only come across this for DBLs before so would guess this thread will trigger some interest. How does the deterioration manifest itself in terms of sound quality- what will we hear/not hear?
  7. garyi

    garyi leave blank

    I have a pair of cherry nSats and the black damping foam in them has turned, it turns into like that oasis stuff used for flowers, looks fine but if you touch it, it deteriorates.
  8. Jo Sharp

    Jo Sharp Pulls on doors marked push

    I had the foam inside the HF cabinet on SL2s go like this...I just ordered some new equal thickness foam from one of the speaker component sellers and cut it to fit.
  9. say it as it is

    say it as it is pfm Member

    I will need to double check my SBLs now grr on plus side what I don't use from the gaskets will get reused

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