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Thread: Speaker wadding on eBay

  1. #31
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,254
    I'm Andrew.

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    Quote Originally Posted by walpurgis View Post
    I thought the damping in the Ditton 15xr was about right, adding more may kill the life in them.
    If I'm not mistaken, stuffing a cabinet with absorbent material will change the effective box volume (it acts as if it was a larger box), so a reflex design will have all its box/port tuning parameters changed and thrown off alignment. Ideally the stuffing and the port tuning need to be designed together, or at least the port tuning needs to adjusted after stuffing.
    Quote Originally Posted by walpurgis View Post
    Speaking generally, rockwool/fibreglass are horrible unfriendly to use materials and best avoided. They are not even particularly good at damping and used to be chosen by manufacturers for cheapness.
    Yes, Rockwool is horrible to work with. I hate even touching it. However, I'm not sure it's true that its damping isn't particularly good. It's recommended as an absorbent material in recording studios, but the compressed/rigid stuff is more effective than the loose/fluffy stuff.

  2. #32
    Join Date: Feb 2018

    Location: Somerset

    Posts: 27
    I'm Ian.

    Lightbulb Bracing is an option that would bot affect box volume too much

    Quote Originally Posted by RothwellAudio View Post
    If I'm not mistaken, stuffing a cabinet with absorbent material will change the effective box volume (it acts as if it was a larger box), so a reflex design will have all its box/port tuning parameters changed and thrown off alignment. Ideally the stuffing and the port tuning need to be designed together, or at least the port tuning needs to adjusted after stuffing.
    The Ditton 15 is not exactly a reflex design, but used an auxiliary bass radiator (ABR) which is tuned to the box volume and bass/mid, so I agree that it is not a good idea to alter the box parameters too much.

    Rather than changing stuffing, I may consider an internal brace or two between the front and back walls could help the boxes structural rigidity. These could start from between the tweeter and min/bass to rear and between the mid/bass and ABR to rear.
    If they were cut so as to be a tight fit and then glued in place, they could be beneficial without changing the box volume too much.

    With speakers of this vintage, I would also think about replacing the capacitors in the crossover.

  3. #33
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,821
    I'm Geoff.

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    Quote Originally Posted by iscm View Post
    The Ditton 15 is not exactly a reflex design, but used an auxiliary bass radiator (ABR)
    An ABR system is a reflex type. The passive radiator does a similar job to a port.

  4. #34
    Join Date: Apr 2014

    Location: swansea

    Posts: 339
    I'm gerald.

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    With speakers of this vintage, I would also think about replacing the capacitors in the crossover.
    I have allready done that and fitted better speaker binding posts

  5. #35
    Join Date: Feb 2018

    Location: Somerset

    Posts: 27
    I'm Ian.

    Default Probably just Bracing and a Rewire left to do

    Quote Originally Posted by diviy View Post
    I have allready done that and fitted better speaker binding posts
    Then the only thing left is bracing and possibly wiring (nothing too fancy).
    Did you change away from any electrolytic's that there may have been?

    I seem to remember that the Ditton 15 tweeter was often used together with a Coles supertweeter in other speaker designs.

    Sorry if this is all a bit off topic for this thread, but as discussed before, it may not be advisable to change the wadding too much in these particular speakers.
    The same applies to all tuned (Reflex, Transmission Line and ABR) designs.

    I suppose that it may be worthwhile using some bituminous damping in the inside panels as used in car deadening kits.
    In my B&W DM70's I glued door mats to the inside of rear panels to great effect, but I think that due to their thickness they would not be appropriate for the Dittons.

    Good luck and let us know how you get on.

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