hi fi exposure

Pete said:
> the speaker that makes the sound is
> pushed backwards and forwards by a varying DC current, to produce the
> sounds, similar to a standard phone, and  its how loudspeaker
> technology works generally, but as its a fairly inconsistant pattern
> of frequencies (unless you play the same music/voice all the time)
> then there are probably less damaging effects, if any.. the
> frequencies are also not all that high or low, 20hz to 20khz on a good
> hifi system..
>
The speakers of hi fi systems, including those in vehicles, are a
source of RF. When I was at my peak sensitivity (was a walking human meter) I
got immediate spasms from being close to an operating speaker.  
Shivani




[Non-text portions of this message have been removed]

Has anyone ever felt any bad effects from a loudspeaker when it was turned off and not even operating (or plugged in?)
.
Sue felt that the large speakers in our lounge might be affecting her even when unplugged. It seems unlikely, but I have removed them as an experiment. As yet she`s not sure if she can feel a difference or not.
.
Certainly Sue has not reacted well to speakers when they are on (including the small ones in speakerphones) presumably due to the transformer coils inside.
.
Ian
----- Original Message -----
From: [hidden email]
To: [hidden email]
Sent: Monday, March 28, 2005 11:23 PM
Subject: [eSens] hi fi exposure



Pete said:
> the speaker that makes the sound is
> pushed backwards and forwards by a varying DC current, to produce the
> sounds, similar to a standard phone, and its how loudspeaker
> technology works generally, but as its a fairly inconsistant pattern
> of frequencies (unless you play the same music/voice all the time)
> then there are probably less damaging effects, if any.. the
> frequencies are also not all that high or low, 20hz to 20khz on a good
> hifi system..
>
The speakers of hi fi systems, including those in vehicles, are a
source of RF. When I was at my peak sensitivity (was a walking human meter) I
got immediate spasms from being close to an operating speaker.
Shivani




[Non-text portions of this message have been removed]


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[Non-text portions of this message have been removed]

>The speakers of hi fi systems, including those in vehicles, are a
>source of RF. When I was at my peak sensitivity (was a walking human meter) I
>got immediate spasms from being close to an operating speaker.

This was not being generated by the speaker cone though, or was it? -
I would assume that the RF was being inducted though the speaker
wiring and possibly the metal frame of the loudspeaker itself, but RF
frequencies surely cannot be transmitted through the actual physically
operating part of the cone and coil/ magnet - the bit that creates the
sound waves and speaker frequencies cut off at 15-20,000 hertz?

I have been feeling a lot calmer since our neighbour went on holiday!
We possibly have an earth that is better than our neigboutrs, and the
house wiring travels from the back garden completely up one side of
the house (in the roof) before getting to our meter box and then back
out again into the house.. we think that because our earth stake may
be better, that we are earthing our neighbours to some degree and
therefore getting stray currents running all the time up the house.


On Mon, 28 Mar 2005 17:23:00 EST, [hidden email] <[hidden email]> wrote: