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Old 12th March 2005, 12:24 AM   #1
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Default Magnetic field insulator

Hi,

I have just finished a home made subwoofer for my home sound system. I placed the subwoofer in a box right underneath my TV, with about a 30cm gap between the box and the tv. Unfortunately, the magnetic field from the sub is affectiing the colour of my TV. Is there any way to prevent this from happening, is there a special insulating material that would prevent too much magnetic field from going out?

Thanks in advanced.
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Old 12th March 2005, 04:00 AM   #2
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A sheet of low-carbon steel might do the trick.
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Old 12th March 2005, 04:15 AM   #3
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mu metal .....

http://digilander.libero.it/paeng/what_mu_metal.htm
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Old 12th March 2005, 09:57 AM   #4
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also, how would i put the metal sheet into application? like how would i place the sheets? inside the box or just around the outside? also, would this in any way affect the soudn of performance of the sub?
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Old 12th March 2005, 11:41 AM   #5
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Interestingly, you cannot insulate magnetic fields (air is as good a magnetic insulator as you can find). However, you can shunt them away with more permeable materials such as iron.

A piece of 22ga. mild steel ran around the speaker would probably do it. I'm envisioning a U shape here, ideally in the direction of the magnet, but that might overlap the cone a bit (unless this sub shoots down, in which case that'll do nicely) so do as good as you can.

Or move the speaker.

Tim
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Old 12th March 2005, 01:37 PM   #6
Mr Evil is offline Mr Evil  United Kingdom
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I've had good luck with side panels of old PCs, or anything else made of mild steel. Just plopping it between the speaker and TV may be enough, or wrapping it around the speaker as Sch3mat1c suggested, or even more directly: around the magnet itself. If one sheet isn't enough then try using several sheets at once.
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Old 12th March 2005, 02:15 PM   #7
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Metal case of PC SMPS...good shield!!
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Old 14th March 2005, 08:00 AM   #8
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i just tried using one of my computer's side panel and place the panel horizontally under the Tv between the sub and the tv, it worked perfectly, no colour distortion on the tv. GREAT!!

thanks alot!
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Old 16th March 2005, 06:45 AM   #9
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try aluminum foil and grounding it!
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Old 16th March 2005, 02:41 PM   #10
bigwill is offline bigwill  United Kingdom
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Quote:
Originally posted by chineerat
try aluminum foil and grounding it!
That's an interesting concept, what affect would grounding it have?
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