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Old 8th May 2008, 10:28 AM   #1
sjanand is offline sjanand  India
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Default Subwoofer magnet and toroidal transformers

In the subwoofer I'm building, there are 2 X 300VA toroids planned as close as 3inches to the subwoofer magnet. My questions are:

1. Would the toroid demagnetize the subwoofer magnet in the long run?

2. Would the subwoofer magnet polarize the transformer to saturate?

Please comment.

Anand
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Old 8th May 2008, 10:37 AM   #2
pjp is offline pjp  India
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Let me add another thing for you to worry about:
3. Will the heat from the transformer / amp spoil the speaker cone ?
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Old 8th May 2008, 10:55 AM   #3
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by pjp
Let me add another thing for you to worry about:
3. Will the heat from the transformer / amp spoil the speaker cone ?
The heat from the voice coil is more likely to be a cause of damage.
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Old 8th May 2008, 11:36 AM   #4
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Default Re: Subwoofer magnet and toroidal transformers

Quote:
Originally posted by sjanand
In the subwoofer I'm building, there are 2 X 300VA toroids planned as close as 3inches to the subwoofer magnet. My questions are:

1. Would the toroid demagnetize the subwoofer magnet in the long run?

2. Would the subwoofer magnet polarize the transformer to saturate?

Please comment.

Anand
1 The transformer has a very low magnetic field around it = NO

2 Not likely with the distance but beware of it.

How big is the speaker element and how big is the enclosure? 600 VA in a small box?
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Old 8th May 2008, 03:53 PM   #5
sjanand is offline sjanand  India
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Peranders,

See http://picasaweb.google.com/anand.su...h/TheSubwoofer

There are two 12" drivers in push-pull config. Enclosure is completely sealed and is around 130 litres. SAF is bad -- Q is good -- around 0.85 measured roughly using SpeakerWorkshop.

I initially planned to plant the amp and transformers on the back panel. I'm now thinking of sqeezing them all into the pull-driver cavity. See snap 6.

--Anand
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Old 8th May 2008, 08:30 PM   #6
bego2 is offline bego2  Croatia
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Nice sub.
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Old 12th May 2008, 06:01 PM   #7
badman is offline badman  United States
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Toroids have good suppression of lateral fields. There is a significant field coming out the top and bottom of the toroid (like a column of flux centered around the hole).

Point this away from the drivers for best results.
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