How to Shield Speakers

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Electromagnetic fields can interfere with the performance of hard drives, video game systems, tube television screens and computer monitors. They are also produced by speakers, which must sometimes be placed in the vicinity of devices they could damage. Here are some tips to help you create a barrier between your speakers' electromagnetic interference and the surrounding components.

Method 1
Method 1 of 2:

Positioning and Proximity

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  1. Many recent models, especially those designed for use with computers or home theater systems, come with built-in shields. Large speaker cabinets such as guitar amps often do not have shielded magnets.
    • Consult the user's manual for information specific to your speakers. There may also be a panel on the back of your speaker or sub woofer with a bunch of fine print. Sometimes this will mention whether or not the device will cause harmful interference.
    • Try using an electromagnetic field detector if you are not sure. These are reasonably inexpensive and can be used to determine if the existing shield has been damaged.
    • In case you are curious, there is no need to shield your speaker wires.
  2. This should be considered a safe distance for magnetic interference.
    • Keep in mind that vibrations from loud sound may cause other kinds of damage to delicate components such as hard drives. Electromagnetic interference is also increased when speakers are used at high volumes. Extra distance may be necessary if you will be blasting your speakers regularly.
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Method 2
Method 2 of 2:

Applying a Metal Shield

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  1. This should be a donut-shaped object directly on the back of the speaker cone.
  2. You will need to have this information when selecting the right shield.
  3. This can be any magnetic metal large enough to cover the back of the magnet.
    • Consider the most readily available materials first. Common steel items like pipe-caps for air ducts or electrical steel junction boxes will do the job nicely. Best of all, you can find them at any hardware store.
    • Special products may be purchased which are designed especially to shield speaker magnets. They are just thick enough to shield the magnet, but are also thin enough to be cut with scissors for just the right shape.
  4. Use a strong adhesive tape to bind your shield to the speaker.
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Community Q&A

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  • Question
    How do I fix color distortion on a monitor from speakers?
    Community Answer
    Most of the speakers contain magnet and if you will keep them near the monitor, the magnetic waves may damage the monitor's colour distribution. Try to keep speakers as far from monitor as you can. The color distortion may go after 5-6 days depending on the monitor. If it does not go it is time to call the technician.
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      Tips

      • To avoid damaging the speaker, do not allow the shield to touch the electrical contacts on the speaker.
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      • Many, if not most, speakers purchased from an electronics store are already shielded. When buying speakers that will be nearby a computer or television, it may be helpful to look for shielding information listed on the label of the box the speakers come in, or talk to an employee of the electronics store about the safety of having the speakers nearby devices that may be affected by them.
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      • Multiple layers of shielding material may be needed depending on the speaker. A pocket magnetometer or gaussometer can be used to determine shield performance.
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      Expert Interview

      Thanks for reading our article! If you’d like to learn more about dealing with speakers, check out our in-depth interview with Steven Racz .

      References

      1. http://www.lessemf.com/faq-shie.html
      2. http://www.clothedandy.com/Voight%20Pipes/shielding.html

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