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#1
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Liquid inside a tweeter
I own a Moudaunt-Short MS10i Classic bookshelf loudspeaker. Recently
one of the tweeters stop working. I was able to fix it since it was a broken wire in the coil connection. However, in this disassembling process I found (in the two tweeters) a dark brown liquid inside the circular groove in the magnet where the coil is supposed to stay. Is this liquid part of the tweeter mechanism (and the coil is dipped on it) or is just moisture accumulated over the years? I am afraid to dry it up. Any help would be very welcome. Thanks very much. Jose Carlos Brunelli |
#2
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"JCBrunelli" wrote in message ...
I own a Moudaunt-Short MS10i Classic bookshelf loudspeaker. Recently one of the tweeters stop working. I was able to fix it since it was a broken wire in the coil connection. However, in this disassembling process I found (in the two tweeters) a dark brown liquid inside the circular groove in the magnet where the coil is supposed to stay. Is this liquid part of the tweeter mechanism (and the coil is dipped on it) or is just moisture accumulated over the years? I am afraid to dry it up. Any help would be very welcome. Thanks very much. Jose Carlos Brunelli I think it's called "ferrofluid". It's main purpose is to conduct heat away from the voice coil. If you remove it, you'll have to replace it. |
#3
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It's called Ferro Fluid. It's a magnetic fluid that dissapates the heat and
increases the power handling of the tweeter. The amount is supposed to be the same in both tweeters as it has an effect on the physical response of the tweeters. Mark T. "JCBrunelli" wrote in message ... I own a Moudaunt-Short MS10i Classic bookshelf loudspeaker. Recently one of the tweeters stop working. I was able to fix it since it was a broken wire in the coil connection. However, in this disassembling process I found (in the two tweeters) a dark brown liquid inside the circular groove in the magnet where the coil is supposed to stay. Is this liquid part of the tweeter mechanism (and the coil is dipped on it) or is just moisture accumulated over the years? I am afraid to dry it up. Any help would be very welcome. Thanks very much. Jose Carlos Brunelli |
#4
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Don't dry it out, leave all you can. This is ferrofluid, which provides
added power handleing and damping to the tweeter. Its effect is part of the reponse of the tweeter, which I assume you do not want to change away from the manufacturer's intended sound qualities.. Wylie Williams "JCBrunelli" wrote in message ... I own a Moudaunt-Short MS10i Classic bookshelf loudspeaker. Recently one of the tweeters stop working. I was able to fix it since it was a broken wire in the coil connection. However, in this disassembling process I found (in the two tweeters) a dark brown liquid inside the circular groove in the magnet where the coil is supposed to stay. Is this liquid part of the tweeter mechanism (and the coil is dipped on it) or is just moisture accumulated over the years? I am afraid to dry it up. Any help would be very welcome. Thanks very much. Jose Carlos Brunelli |
#5
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JCBrunelli wrote:
I own a Moudaunt-Short MS10i Classic bookshelf loudspeaker. Recently one of the tweeters stop working. I was able to fix it since it was a broken wire in the coil connection. However, in this disassembling process I found (in the two tweeters) a dark brown liquid inside the circular groove in the magnet where the coil is supposed to stay. Is this liquid part of the tweeter mechanism (and the coil is dipped on it) or is just moisture accumulated over the years? I am afraid to dry it up. Any help would be very welcome. Thanks very much. Jose Carlos Brunelli That sounds like Ferrofluid. It is supposed to help conduct heat from the voice coil to the surrounding magnet structure; and perhaps to provide some mechanical damping to the voice coil. -Gene Poon |
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#7
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#8
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#10
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You should avoid potential generic audiophile advice from some who say that ferrofluid doesn't sound better etc and to remove it. It's true that you see much less of it these days in the upper range drivers. The tweeter was designed to have it in there so if you would remove it, the chances are good the frequency response will be linear, but no longer neutral (flat). I like your tenacity to do this, it's fun to do that kind of stuff isn't it? Wessel Thanks for the reply. Yes it was fun and I was very lucky being able to fix it. I do not understand how this thin wire broke but some of the fluid reached external areas (maybe by some capillarity process) far away from the gap and coil. |
#11
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JCBrunelli wrote:
...I do not understand how this thin wire (to the tweeter voice coil) broke... Probably just flexing over a long period of time, perhaps helped along by extreme excursions of the tweeter dome. It is not that uncommon a fault, and splicing or soldering the wire occasionally is necessary to fix a speaker at all, if the tweeter is no longer available from its manufacturer. It does take good eyes and steady hands. -Gene Poon |
#12
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Gene Poon wrote:
JCBrunelli wrote: ...I do not understand how this thin wire (to the tweeter voice coil) broke... Probably just flexing over a long period of time, perhaps helped along by extreme excursions of the tweeter dome. It is not that uncommon a fault, and splicing or soldering the wire occasionally is necessary to fix a speaker at all, if the tweeter is no longer available from its manufacturer. It does take good eyes and steady hands. -Gene Poon I had a lot of failures with burnt dome tweeter voice coils once. It turned out they always blew at the bend where the wire went underneath the coil to go upwards to the connection. That bend was so sharp, that the conducting diameter went down, heating up too much and burned away. I talked to the manufacturer, who changed the method and voila- no more failures. -- ciao Ban Bordighera, Italy |
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