HELP: Need Answer on Shielding
 

Hope someone can shed some light here.
I have an older pair of front speakers that sound really great but they are
not shielded. Is there a way or a procedure whereby I can get them shielded?
What does'Shielded' actully mean and how is a speaker shielded?

Thanks in advance for any response.
Winston

What does'Shielded' actully mean and how is a
speaker shielded?

Speaker magnets (or for that matter any type of magnets) can distort the
image on a CRT television or monitor. The CRT guns are aimed using
electromagnetic force. Introduction of stray magnetism, say from a speaker
resting on top of the TV set, cal pull the image out of line causing a
rainbow like distorted smudge over part or all of the screen. For years
speaker manufacturers have designed "shielded" speakers to prevent this
problem. Many PC speakers are shielded because users tend to install them
directly alongside their monitors.

The usual method of shielding is to enclose the speaker's magnet in a mu
metal cup. Mu metal redirects the lines of magnetic flux. Placement isn't
as simple as lining the inside of the speaker cabinet although that may
help. Also, mu metal is expensive stuff. It might be cheaper to buy a new
shielded speaker than to try to upgrade an existing one.

Note: You need a shielded center channel if the speaker rests directly
above or below your CRT based TV set. You usually do not need to worry
about shielding on large RPTV sets because the magnet is too far from the
CFRRT guns to impact the image. It should also go without saying that
shielding is completely unnecessary with front projection systems.

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Regards,
Robert

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Winston,

Is there a way or a procedure whereby I can get them shielded?

Everything Robet said is right on the money, as usual. All I'll add is that
shielding is not necessary UNLESS you're having the type of interference
problems Robert described. It won't make the loudspeakers sound any better.

--Ethan

http://www.birotechnology.com/articles/shielded.html

randy

"Winston" wrote in message
nk.net...
Hope someone can shed some light here.
I have an older pair of front speakers that sound really great but they
are
not shielded. Is there a way or a procedure whereby I can get them
shielded?
What does'Shielded' actully mean and how is a speaker shielded?

Thanks in advance for any response.
Winston

Winston, unless the speakers are about 12 inches from your picture tube you
probably won't have a problem. I use to work with mu metal in the computer
industry. That's how we protected computer tapes from motors etc. JB

"Winston" wrote in message
nk.net...
Hope someone can shed some light here.
I have an older pair of front speakers that sound really great but they
are
not shielded. Is there a way or a procedure whereby I can get them
shielded?
What does'Shielded' actully mean and how is a speaker shielded?

Thanks in advance for any response.
Winston