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Why aren't all speakers shielded? Please explain shielding to me... (1 Viewer)

Jeff_M

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Nov 26, 2000
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Could someone explain what is involved in shielding a speaker so that it can be used near a tube-based television? Why aren't all speakers shielded? Is there an actual change in the components of the speaker involved? Any adverse effect on sound? Why does it often cost more to buy a shielded version of a speaker? I am completely in the dark on this one and would appreciate any of your kind expertise!
 

Ned

Supporting Actor
Joined
Feb 20, 2000
Messages
838
Simple cost-cutting. Shielding requires bucking? magnets to shield the stray magnetic fields. No sense putting them in every speaker you make when most won't be near a tv. What sucks is that many companies do not offer the option at all so you have less choices sometimes (hello B+W?)
 

Eric_M

Stunt Coordinator
Joined
Dec 13, 1999
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What would be the safest distance for most speakers to be away from a TV to prevent any sort of interference. I am wondering so I know wether or not it is worth that extra money or not.
 

Drew Eckhardt

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May 10, 2001
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246
I ran my (unshielded) main speakers 7-8' apart when I was using a 32" Sony Wega with no problems. Given reasonable main speaker placement, I don't think you'll have problems.

Of course, front projection makes the problem go away :)
 

Ned

Supporting Actor
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Feb 20, 2000
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838
It depends on the tv. My regular KV Sony 27" seems very susceptible to magnetic fields. My B+W's are 18" from the edge and they still show a little smearing. The same speakers at the store had no effect on a Toshiba set even right beside.
 

Ash

Auditioning
Joined
Mar 8, 2002
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A good idea to clear the smear is to switch off the tv (not keeping it on standby mode) a few nights a week. This allows the tube to degauss.
 

Eric_M

Stunt Coordinator
Joined
Dec 13, 1999
Messages
218
Drew,

You mean each speaker was 7 - 8 ft away from the TV?

I ask as I am considering the 32 inch Wega set also(the FS13 model) and I will most likely end up with Monitor 7s or Minis and wonder if it I can just get the unshielded and be fine. My speakers would be set about 3ft away from the set.

Another quick question to anyone, when you buy unshileded speakers, is it possible to shield them later on if need be?
 

Michael Marklund

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Mar 3, 2002
Messages
160
Jeff,

If your speakers (mains) will be very close to your tv, you will pretty much need to go with shielded speakers. The shielding keeps the magnetic field from skewing the color on your tv. Direct view tv's are more susceptible than rptv's, but even when I emailed Mitsu about speaker placement next to my rptv, they said an unshielded speaker had to be at least 1' away from the cabinet.

Shielded speakers cost more b/c there's slightly more to making them. When I looked at Paradigm, the shielded ones ran $60.00 more than unshielded. Most speaker company websites will indicate shielded/unshielded in their tech specs. Between that and input from HTF members, I was able to come up with quite a list of speakers to chose from that were shielded.

Probably the best example of the need for shielding is in center speakers. As these are almost always placed on top of one's tv, they need to be shielded. And you'd be hard pressed to find a center speaker that's not shielded.

If you need help finding shielded speakers, do a search on this forum for shielded floorstanders that was running about amonth ago.

Regards,

MM
 

Steve_Ma

Second Unit
Joined
May 7, 2001
Messages
420
My 32" vvega also seems quite suceptible to magnetic feilds. My B&Ws (603S2) NEED to be at least 16-18" away. Oddly enough....my B&W sub (ASW1000) is sheilded. I never knew this till I got a new TV/stand and was able to experiment with different sub placements for better audio. I now have that sucker right next to the TV with no probs. It's a good thing too, as right next to the TV is clearly the best place for the cleanest sub response. As long as I'm stuck in that odd a#$ room, any sub I buy will NEED to be sheilded :rolleyes.
--Steve
 

BrianWoerndle

Supporting Actor
Joined
Feb 19, 2002
Messages
794
Would you be able to shield speakers later on if need be?
Not really. It is possible that you could open up the speaker and put a counter-magnet on the existing magnet, but it is not very realistic. If your speakers are going to be 12"-18" away or more, you should be fine with unshielded speakers. If you notice the picture distorting, you either need to move them farhter or get shielded speakers.

Check with your Paradigm Dealer and see if you can try the unshielded speakers, and if you need trade them up to shielded ones. Most dealers will give you a trial period for speakers.
 

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