Electromagnetic fields can interfere with the operation of hard drives, game consoles, CRT televisions, and computer monitors. Electromagnetic fields are also produced by the speakers that are placed near these devices. Below you will find some tips on how to shield the speakers to reduce electromagnetic interference and not disturb other components.
Steps
Method 1 of 2: Adjust the Proximity
Step 1. Make sure the speakers have not already been shielded
Many recent models, especially those designed for use with personal computers and home theater systems, are already shielded. However, large speakers such as guitar amps are often unshielded.
- Consult the speaker manual for information on this. Otherwise, this information may be on a label stuck behind the speakers or subwoofer. This label typically indicates whether the device can or cannot create harmful interference.
- If you are unsure, try using a magnetic field detector. Generally this type of equipment does not cost much and is useful if you want to check if an existing shield has been damaged.
- In case you are wondering, there is no need to shield the speaker cables.
Step 2. Place each crate at least 1 meter away from any device sensitive to electromagnetic fields
This is generally a fairly safe distance with regard to electromagnetic interference.
Note that speaker vibrations may also cause damage to delicate components such as hard drives. Furthermore, electromagnetic interference increases if the speakers are used at high volumes. If you intend to listen to loud music, you will therefore need to increase the distance of the speakers from components sensitive to electromagnetic interference
Method 2 of 2: Create a Metal Shield
Step 1. Open the back of the speaker cabinet and identify the magnet
This should be placed behind the cone and look like a donut.
Step 2. Measure the size and shape of the magnet
You will need this information to select the right shield.
Step 3. Purchase the material to build the shield
That is any magnetic metal large enough to cover the back of the speaker magnet.
- Try to look for easily available materials.. Metal objects such as air duct pipes or iron electrical boxes will do. The convenience of these materials is that you can find them in any hardware store.
- Otherwise it is possible to purchase special products specially designed for electromagnetic shielding. These shields are thick enough to shield the magnetic field and thin enough to be cut with scissors into the desired shape.
Step 4. Apply the shield
Use strong adhesive tape to attach the shield to the crate.
Advice
- To avoid damaging the speaker, do not put the shield in contact with the electrical contacts of the speaker.
- Many, if not most, speakers that you can buy at electronics stores are already shielded. If you buy speakers to be placed near computers and televisions, it would be a good idea to look for any information on the shielding on the box label, or ask the shop assistant directly.
- Depending on the crate you may need to use different layers of shielding. Use a gaussometer or pocket magnetometer to measure the effectiveness of the shield.
