"attempting to reconcile claims with physics is not bad-mouthing"
Tell that to the guys that cry every time you try to discuss "scientific facts" vs their "bold claims". Manufacturers that sell snake oil don't like facts or bright lights that expose them for what they are. After all, didn't you know that physics has no place in "high end" audio. Physics went out of date years ago : )
As far as shielding goes, the main factors are depth, coverage area and materials used. As you mentioned, one can smother a device in a given material, but that doesn't mean that material doing the smothering is actually effective as a shield. Then again, one can also use much less of another material, and if properly placed, achieve phenomenal results in terms of shielding.
These factors can be put to work for us though IF we know how to manipulate the variables properly. That is, some materials are quite effective at blocking RF but are near useless at base-band frequencies. Since we don't want our AC signals "contaminated" with RFI, and at the same time, we don't want to interfere with the normal rise and fall of the current induced magnetic field that occurs at low frequencies, it IS possible to have the best of both worlds. I'm not saying that one can do this with carbon or any other specfific material, i'm just saying that a "less efficient" shield isn't always "useless" under specific situations. Think about this as it is something that many manufacturers / DIYer's overlook. Sean
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Tell that to the guys that cry every time you try to discuss "scientific facts" vs their "bold claims". Manufacturers that sell snake oil don't like facts or bright lights that expose them for what they are. After all, didn't you know that physics has no place in "high end" audio. Physics went out of date years ago : )
As far as shielding goes, the main factors are depth, coverage area and materials used. As you mentioned, one can smother a device in a given material, but that doesn't mean that material doing the smothering is actually effective as a shield. Then again, one can also use much less of another material, and if properly placed, achieve phenomenal results in terms of shielding.
These factors can be put to work for us though IF we know how to manipulate the variables properly. That is, some materials are quite effective at blocking RF but are near useless at base-band frequencies. Since we don't want our AC signals "contaminated" with RFI, and at the same time, we don't want to interfere with the normal rise and fall of the current induced magnetic field that occurs at low frequencies, it IS possible to have the best of both worlds. I'm not saying that one can do this with carbon or any other specfific material, i'm just saying that a "less efficient" shield isn't always "useless" under specific situations. Think about this as it is something that many manufacturers / DIYer's overlook. Sean
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