How do you magnetically shield a speaker?
mat1i...@my-deja.com
magnetically shield a speaker. I got a nice pair of Tannoy System 800
monitors for a geat price and I need to get some shielding for 1 of them
because it is to close to my PC monitor and I can not move the PC
monitor so I most figure out who to shield the speaker. Thanks for your
time & help.
Matt.
Sent via Deja.com http://www.deja.com/
Before you buy.
Scott Dorsey
>I have searched all over the web and I can not find any info on how to
>magnetically shield a speaker. I got a nice pair of Tannoy System 800
>monitors for a geat price and I need to get some shielding for 1 of them
>because it is to close to my PC monitor and I can not move the PC
>monitor so I most figure out who to shield the speaker. Thanks for your
>time & help.
Basically, you don't.
Sheilded drivers are designed that way. You can't "add shielding" to a
driver.
Yes, it's possible to use a bucking magnet to produce a field that counters
out the field of the woofer magnet, but it's difficult to make it work
right in all directions unless the woofer is designed for it.
Yes, it's possible to use mu-metal or very thick ferrous alloys to shield
the thing, but half-inch steel plate also doesn't help the room acoustics.
What you want to do is more difficult than trading the speakers in for
some that are designed for low leakage.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Mike Rivers
> I have searched all over the web and I can not find any info on how to
> magnetically shield a speaker. I got a nice pair of Tannoy System 800
> monitors for a geat price and I need to get some shielding for 1 of them
> because it is to close to my PC monitor and I can not move the PC
> monitor
What's all this "I can't" that I'm reading here these days? Can't
move the monitor, can't re-record the part, can't afford what you
really think you need . . . Move something, dammit. You will never
successfully shield the speaker. Move into another room. Move into
another house or shop. Move the monitor out to the kids' room and
move in one that's better shielded.
Speakers that are designed to operate near CRTs aren't just shielded,
they have magnets specifically designed to have closely contained
fields.
--
I'm really Mike Rivers (mri...@d-and-d.com)
Paul Patenaude
"semi-shielded". When I voiced our concerns to our vendor (Oakwood Audio)
they contacted TGI who are the North American distributors of Tannoy
products. TGI arranged to have shielded drivers installed in the monitors at
our site. It took about 10 minutes per speaker. You might be able to get a
retro-fit kit from them directly and do the work yourself. It doesn't seem
that complicated. You can reach TGI at 519-745-1158. They are located in
Kitchener, Ontario.
Paul Patenaude
NetStar Communications Inc.
<mat1i...@my-deja.com> wrote in message
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Charles Quinn
>magnetically shield a speaker. I got a nice pair of Tannoy System 800
>monitors for a geat price and I need to get some shielding for 1 of them
>because it is to close to my PC monitor and I can not move the PC
>monitor so I most figure out who to shield the speaker. Thanks for your
>time & help.
You need a "Faraday Cage". Search on this. Essentially you need a copper
screen that is grounded, your house ground would work fine.
Charles
Les Cargill
A Faraday cage shields against electrostatic fields, not against magnetic
fields.
>
> Charles
Scott Dorsey
BZZT. Faraday cages will do nothing about static magnetic flux. They
only shield against RF and electrostatic charges. E field yes, B field no.
Arny Krueger
to
> magnetically shield a speaker. I got a nice pair of Tannoy System
800
> monitors for a geat price and I need to get some shielding for 1 of
them
> because it is to close to my PC monitor and I can not move the PC
> monitor so I most figure out who to shield the speaker. Thanks for
your
> time & help.
>
If you look at "magnetically shielded" speakers you find one or two
obvious things:
(1) A heavy steel can that covers the magnet assembly and rides on
the frontmost piece of steel.
(2) A smaller "bucking" magnet that tries to cancel out part of the
external magnetic field, usually on the back of the magnet assembly.
What aren't so obvious are various subtle design features on the
magnet assembly that reduce external fields like rounded edges, etc.