A few years ago I use 3 and something
Henrys air-core coil made up with… 8ga wire. It was a barrel of cupper
that acted like a sponge for any airborne dirt. I have in one side of
my room (what right speaker lives) something that I called “Area 51”.
At tie location (approximately 3’x3’) any coil suck in EMI from air
with a force of a mid size back hole. If I positioned the coil in there
then by changing the angle of the coil I was able to change sound quite
tangibly. I did not measure the Gausses in there but I know what was
going on and I ended up building sarcophagus for the right speakers
crossover. I used CO-NETIC alloys for that reportedly has magnetic
shielding 800 times stronger then steal of the same thickens. It worked
very nice with exception that all of those Magnetic Shield
Corporation’s products are quite expansive…
Well, something suggests me that you might have the very same
problem. In fact may people with high sensitively drivers have then but
not a lot of them have ability to understand or detect it as thier
noisy and dirtily electronics mask out the effect of environmental
magnetic influence…
Rgs,
The caT
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