My crossover is pretty near the magnet of the woofer and I wondered if I should shield it in some way. When I was a kid in school we used MU metal in electronics cases to keep the noise lower. I don’t think that is good for magnets but I wondered if there was a way to shield things...
Crossover position near magnet
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An eighth inch of mu metal will do it. Anything less isn't worth the bother. Moving the coils even an inch will help, as the flux intensity of a magnet drops as the square of the distance. -
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I almost always put my low pass and high pass sections on different boards. Doing so you're far less likely to make a mistake in the wiring, the smaller board sizes make it easier to mount them out of the way, and since the inductors on the high pass and low pass boards are much further apart cross talk is eliminated.Comment
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I almost always put my low pass and high pass sections on different boards. Doing so you're far less likely to make a mistake in the wiring, the smaller board sizes make it easier to mount them out of the way, and since the inductors on the high pass and low pass boards are much further apart cross talk is eliminated.Comment
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Steve,
If you have a DATS and a loose inductor, I'd test the inductor in it's position before going through all the trouble of re-doing anything. I did some testing on coil proximity to neo magnets on the ND91 for the Bantam crossover (air coil inductors, not laminated) and there was very little difference in it's value even just a few inches away, barely measurable.
Of course, the magnet on your woofer there is a fair bit larger, but you might give it a test before doing a bunch of work... it may not be that big of a deal.
TomZZarbo Audio Projects Youtube Channel: https://www.youtube.com/channel/UCEZ...aFQSTl6NdOwgxQ * 320-641 Amp Review Youtube: https://youtu.be/ugjfcI5p6m0 *Veneering curves, seams, using heat-lock iron on method *Trimming veneer & tips *Curved Sides glue-up video
*Part 2 *Gluing multiple curved laminations of HDFComment
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Steve,
If you have a DATS and a loose inductor, I'd test the inductor in it's position before going through all the trouble of re-doing anything. I did some testing on coil proximity to neo magnets on the ND91 for the Bantam crossover (air coil inductors, not laminated) and there was very little difference in it's value even just a few inches away, barely measurable.
Of course, the magnet on your woofer there is a fair bit larger, but you might give it a test before doing a bunch of work... it may not be that big of a deal.
TomZComment
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If the magnetic field from the woofer's permanent magnet is static (which it should be) and your crossover inductor is not moving in the magnetic field (which it shouldn't be) then there will be no effect on the inductor, unless its core is already very near to saturation. I highly doubt that you are pushing those big iron cores anywhere near saturation. Electromagnetic Fields 201.Craig
I drive way too fast to worry about cholesterol.Comment
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I've noticed that, although neo magnets are more powerful than ferrite, their strength is focused much more closely to the magnet than with ferrite magnets. Or at least that's my observation.
I think that's why neo magneted drivers are considered "shielded" their sphere of influence is much closer to the magnet.
TomZZarbo Audio Projects Youtube Channel: https://www.youtube.com/channel/UCEZ...aFQSTl6NdOwgxQ * 320-641 Amp Review Youtube: https://youtu.be/ugjfcI5p6m0 *Veneering curves, seams, using heat-lock iron on method *Trimming veneer & tips *Curved Sides glue-up video
*Part 2 *Gluing multiple curved laminations of HDFComment
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