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Wharfedale Owners Thread

Discussion in 'British Audio' started by tyeeslayer, Sep 10, 2013.

  1. VanArn

    VanArn New Member

    Messages:
    43
    Location:
    Melbourne,Australia.
    The Wharfedale cloth surrounds were treated with a black rubber compound, and in many cases a 100% seal was not achieved. There are flexible sealant coatings available from many sources that will fix this small problem, although I have a preference for dimensional fabric and craft paint, Black Shiny No. PM 101,originally obtained under the 'Polymark' trade name which is now known as Duncans. However there can be other reasons for the bass shortfall that you are experiencing and I suggest that you check for the following issues:- a creased cone, braided pigtail leads that have frayed , the paper voice former has crumpled or the voice coil that has partially unwound due to adhesive failure. These are vintage speakers and they do require remedial attention from time to time to keep them in good order.
     
  2. ducati2

    ducati2 AK Subscriber Subscriber

    Messages:
    472
    Location:
    Oklahoma
  3. VanArn

    VanArn New Member

    Messages:
    43
    Location:
    Melbourne,Australia.
    The book,"A to Z in Audio" by G. A. Briggs ( First Edition 1960), shows how the roll surrounds were manufactured. The cloth material was formed to the required shape by a pneumatic press and afterwards it was coated with the black compound to make it airtight. If your surrounds are porous to the flow of air then the application of a sealant is beneficial and it should be mentioned that it is not unknown for the surrounds to have gone hard as the original sealant loses flexibility over time.
     
  4. maicomutt

    maicomutt New Member

    Messages:
    8
    Location:
    Mansfield,Ohio
    Hello, can't offer advice as to why your bass is lacking but can only offer that after installing the Russian PIO's in my W-90's
    I wasn't sure that I heard a sonic improvement, that is until near the 100 hr. mark.
    Much improved across the spectrum especially the bass, tighter, stronger. I have not sealed the surrounds but they sound similar in description to yours.
     

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  5. ducati2

    ducati2 AK Subscriber Subscriber

    Messages:
    472
    Location:
    Oklahoma
    I think I found much of the issue... I was running them w a solid state kenwood 70 wpc and switched to a fisher 500c tube unit. OMG. Night and friggin day!! I only have 20 hours on the PIO caps so I bet it gets sweeter from here. Still curious about doping those surrounds though, just might do it yet.
     
  6. markkb

    markkb Active Member

    Messages:
    104
    Location:
    Mountain View, CA
    Was reading here about coating the cloth surrounds of wharfedale drivers. I've had/have 2 pair of W60 and W70's, all the early ported speakers, plus a few cloth surround drivers I picked up. None of the cloth surrounds in these drivers/speakers show any evidence of being previously coated. The surround weave is a fine black thread with obvious uniform porosity through out.
    Further, the surround compliance does not appear to have 'changed', they retain the roll shape and action from what I can tell. I venture to say that they probably still function with the same compliance they were intended to.

    I think it would be big mistake to treat the surrounds on these drivers to 'seal' them. That would change the compliance. This is certainly true of all the ported wharfedales, with a port, what purpose does sealing accomplish?

    I don't have any experience with the drivers of the non-ported wharfedales, so I can't comment on those. Is it clear that Wharfedale intended the later non-ported speakers to be completely sealed, with an acoustic suspension design principle?
    Mark
     
  7. ducati2

    ducati2 AK Subscriber Subscriber

    Messages:
    472
    Location:
    Oklahoma
    Thanks for posting. I have decided not to coat the surrounds, although it sure seems half the folks tell me to. I do think mine were never coated at factory. One question is with w90s, one woofer chamber is sealed airtight except the air that would travel via the surround. The other chamber is highly vented. I guess they could not decide on this issue at factory, kinda weird.
     
  8. markkb

    markkb Active Member

    Messages:
    104
    Location:
    Mountain View, CA
  9. ducati2

    ducati2 AK Subscriber Subscriber

    Messages:
    472
    Location:
    Oklahoma
    Non vented side has a port, but it is plugged at the factory... another mystery...
     

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