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To: mr.mark who wrote (13906)	12/11/2000 1:00:21 AM
From: bosquedog	Read Replies (1) of 110652

Properly shielded refers to being shielded from magnetic interference. On speakers, it is a metal shield around the magnet to prevent interference to the monitor. A couple of folks are having a problem with electricity currents creating a magnetic field on the dream machine thread right now. landfield.com 12.15 Can I magnetically shield my speakers for use near a TV? You probably will need to buy speakers that are made with an integral magnetic shield. Magnetic shielding is usually done by either shielding the speaker magnet or by cancellation of the magnetic field very close to the magnet, or by both. Shielded speakers are NOT built by lining the enclosure with metal. While it sounds like a good idea, it doesn't work. A common magnet shield is a mild steel cup around the magnet. This is the cheapest shield, and is usually fairly ineffective. It also will interfere with the speaker's critical magnet gap, so this type of shield can hurt speaker performance by shorting the magnetic field and reducing the magnetic flux density in the gap, which can reduce efficiency and affect the speaker's low frequency performance. Cancellation is done using a reverse-polarized magnet glued to the back of the main magnet. If done right, it can almost completely cancel the rear stray field. In some cases it can also increase the magnetic flux density in the gap, which may or may not be desirable. smartcomputing.com If you plan on locating your speakers close to your computer monitor, you should make sure that you select computer speakers that are magnetically shielded. Shielded speakers have magnetic shielding in them so that the speaker magnets do not interfere with the performance of your computer monitor. If you set computer speakers (or any set of speakers) close to your monitor, the magnetic field from the speakers interferes with your monitor’s display. Magnetic fields can cause your monitor to have problems such as flickering and color distortion. Most of the computer speakers are now magnetically shielded so these problems do not occur, however it is a good idea to double check that your speaker selection is shielded. The least we can do is help root around while you break new ground with Win 2000.<G>

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