Question about Alesis M1-Active MkII Main / Stereo Speaker

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Busted cone (i think)

Hi, my left speaker is distorting, i think that i may have a small tear or loose glue somewhere on the cone. how should i fix it?
Peace

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  • nomdecodenik Aug 21, 2012

    Did you get this fixed, is the problem solved?

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First try swapping the leads on your source, powering the left speaker with the right channel, and the right speaker with the left, if the problem follows, then the issue is with your source, and not the speaker.
If the cone is torn, then try to patch it, using some basic glue and several layers of tissue paper. White Glue, embed tissue paper in the glue, more glue,embed tissue paper in the glue, do this several times building up several layers. Guessing this is a standard paper cone...
Now if you are still having the issue, could be that the woofer is damaged. Look for a replacement.

john

Posted on Aug 20, 2008

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1 Answer

Fix a torn speaker cone?


If it is a woofer, you would probably fix it quite easy. If the speaker driver is used for both bass and midrange, you have a problem.
Fixing a speaker cone is depending on the material. If it is paper cone, it is very easy by using paper that you glue with wood glue (White water based glue) on to the cones rear side (for estetic reasons).
A midrange or bass/midrange driver is operating in frequencies where the cone starts to break up. Not torn apart, but the break up frequency is the frequency where the inner and outer part of the cone not longer follow each other in the same direction. These properties of a cone determine the sound of the speaker which is that type of speaker drivers "identity". Messing that identity up, you end up with a speaker that does not sound as the original one.
Remember that cross over network used to split up frequency ranges, not only are lowpass, bandpass, and highpass filter, but they also filter irregularities where the speaker driver is not longer providing a linear frequency response (Its characteristic sound).

If the cone is polypropylene, there isn't much glue that bite on that material.

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1 Answer

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Do not use any glues over the foam, it makes the foam get harder and probality of further damage leading speaker replacement. If you have a masking paper tape try to stick on torn area atleast to avoid further damage. But, all this attempts will give a loss on speaker's audio response. If you are not a big audio phile , you can manage doing it.
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BLOWN SPEAKER, BOSTON


If you can get to the back of the speaker cone you could try a little touch of duct tape over the back of the crack. Pretty strong stuff and if your lucky no one will ever know!

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