quote:
Originally posted by Ryxpia
quote:
Originally posted by CookieRevised
not shielded by construction
Umm, what?
Computers and other electrical equipment especially stuff which radiates radio waves (eg: wifi)) can/will influence audio signals (which are after all also electrical waves).
To stop this in wires you use, among other possible things todo, shielded cables (the silver or copper colored metalic skin around wires inside the cable).
Speakers themselfs are also influenced by this.
eg: if your cellphone detects a signal you can hear a distinctive sound over your speakers. Happens many times in cars. Also the reason why you must always completely turn off your cell phone (and computer) in theaters and in aircraft (in theaters to not distort the sound system, and in aircraft to not influence the very sensitive and crucial electronics)!!
There are two main ways to shield speakers: magnetic and via how they are build into the case. With magnetic shielding, they use a magnet to counteract the influence; opposites equal eachother out.
A better method is to enclose your speakers into a metal case (
Faraday Cage), this is based on the exact same principle of seeking shelter in your car in a heavy lighting storm to protect you from lighting. Which is the very same thing why you often can't use your cellphone inside some buildings; waves from outside are neutralised by the 'cage'.
But because this involves the use of metalic materials, the construction of such speakers is more difficult, takes a bit longer and thus this costs more, hence why this is rarely done, especially for plean speakers.
Magnetic shielding is, in one form or the other, always done to a certain extent though. Unless you have _really_ cheap speakers of course
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