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Shielding a subwoofer? Monitor is not happy.
Zebidee:
--- Quote from: BobA on August 22, 2007, 10:56:08 pm ---Some people have shielded smaller speaker with tin cans but since yours is larger a cookie sheet is probably your best bet.
--- End quote ---
I've tested this wives tale thoroughly with cans and steel cladding, and found that it does nothing (or virtually nothing) to stop the magnetic field. Commercial shielding material is much, much better, around 20,000 more powerful than steel plate at stopping magnetic fields.
BobA:
Before spending approximately $20 a square ft for a nickel alloy foil I would give a try to the old wives tale method since there is probably a cookie sheet around the house that would work for testing for free.
bluevolume:
--- Quote from: BobA on August 23, 2007, 09:50:25 am ---Before spending approximately $20 a square ft for a nickel alloy foil I would give a try to the old wives tale method since there is probably a cookie sheet around the house that would work for testing for free.
--- End quote ---
Are you talking about just laying the cookie sheet down flat below the speaker, or do I need to cut it and roll it around the driver?
Zebidee:
Bob, I really did give the old wives tale a really good go but it all came to nothing. The speakers still affected my monitor. Even with several layers of steel building brace rolled around it and a layer of steel behind. It'll even affect my sony PVM, which has metal shielding around it as well! MYTHBUSTED! Might work on the earth's magnetic field, but not on strong speaker magnets.
You can buy rolls of magshielding stuff that is flexible, sort-of like a fridge magnet, and easy to work with. It literally sticks itself to the magnetised back of the speaker. Worth buying if you have a lot of speakers to do, I suppose.
However, I love being proved wrong about these things so long as someone can demonstrate to me that it actually works! ;D
scotthh:
Here are the options:
1. Replace the subwoofer with a shielded one (I did a little searching, and couldn't find one)
2. Shield the subwoofer:
DIY instructions.
Discussion that suggests this isn't cheap or easy.
3. Move the subwoofer.
Subwoofers are non-directional (it doesn't really matter where you put them, unlike your left and right stereo speakers). Why not splice the wires and place the subwoofer in the bottom of your cabinet? Although you planned on putting it behind the marquee, it looks like changing your design is the cheapest, easiest most practical solution.
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