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Status Replies posted by tysontom
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Hi Tom, thanks for your comment. As I would like to have you in Buenos Aires to hear more about these stories, as you can imagine they never arrived in Argentina, I appreciate sharing them with me. I tell you that the numbers are 31169/31170 and the year is 1958. The boxes are like new. Imagine if they were from the US embassy, and then had only one owner, they were very well taken care of. Unfortunately I sent the two woofer for repair, I prefer that they be measured with the same graduation. I send you warm greetings from Buenos Aires, and if you come one day, I would like to receive you. Hug.
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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.
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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
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