| speaker repair [message #2635] |
Wed, 02 April 2003 07:58 |
stevem
Messages: 4863
Registered: June 2004
Location: NY
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Senior Member |
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Hi. Here is a way to possibly repair a speaker that has developed a voice coil rub from a cone that has shifted. The way to determin if the rub noise is comming from just a out of alingment cone, or a rub due to a overheated and seperated voice coil winding, is as follows.Hold the top of the cone at 180 degree intervals, in 4 to six different places ( IE north and south, E and W, NE and SW, and so on)while pulling in and out on the cone and silghtly loading the cone side to side so that the voice coil gets shifed in the magnet bore some what. If you find that the rub can be stoped by a slight relocation of the cone, you have a shot at saving the speaker. Heres how to do it and what you will need. 1) some brown twine cord,(2) a modeling size paint brush,(3) nail polish remover, and time, do not try to rush this it may take 2 or 3 trys.First determine which way the cone has to be shifted, a blown voice coil rub will not be able to be stopped by the shift method.Once you determine that,rap the cord around the top of the voice coil, where it joins the spider moulding, opposite the magnet, and tie it off to the speaker fram or something else so that you can offset the voice coil and stop the rub.Once you have got this the rest is easy. Open that nail polish remover, and with the brush apply some around the the first to rings of the spider. This will soften its position as to how it locates the voice coil, and when it drys the cone will be relocated and the rub will be gone. do this slowly!! you want to apply just enough remover to be able to reset the cone little by little. Even if it takes 4 or 5 trys. this procedure is for speakers with a aluminum voice coil dust cover. If you have a speaker with out one heres a better way. with a new singal edege rasor cut out the dust cover as close as you can to the cone.Do this slowly you may slip and cut the cone and be up the smelly creek.Then get a index file card. Cut a section of this so it is just long enough to rap around and be inserted inbetween the inner side of the voice coil and the pole of the magnet. The hight of this shim makes no difference. Once in place, apply the remover to the spider as said before. When the cone is ok call up parts plus, and order a replacement dust cover of the size of about what you need ( larger is OK) and glue it on and your done.
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