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tysontom

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  1. Hi, I left this message for Roy, but i guess he's busy today. i applied that sealer to both speaker's woofers. The one passes the push test. On the other one, there is no effect. On that one, the dust cover is a domed affair and its material looks just like the surround. Can it be leaking air? Can I seal it as well? On the good woofer, the dust cover is a slightly domed felt.

    1. tysontom

      tysontom

      As I said before, make sure there is not a cabinet leak somewhere else.  You do not want an absolutely air-tight cabinet, but you do need an "acoustical" seal, thus the slow return of the woofer when depressed, or put another way, the woofer should feel like it is being moved through a viscous fluid.  The cone should not bounce back immediately when depressed.  The dust cap is probably not critical, since the space between the voice coil and the pole piece is very small and won't let much air pass through, but there are holes in the voice-coil former ("bobbin") that do allow air to pass through.  

      You could put the sealer on the dust cap since it is cloth, and see what that does.  When you push in the woofer, see if there is any air movement at the dust cap.  There is the risk of over-damping the woofer, but this probably isn't the case here.  Give it a try, but put a light coat on the dust cap.

      --Tom Tyson 

    2. DKinYORKpa

      DKinYORKpa

      I got impatient for a reply so I posted on the forum. As I said there, air is definitely passing thru that dust cap.

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