Its best to just follow my basic guidelines for coil placement:
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generally always: bumpy sides away from the skin
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when stacking coils, tape them bumpy-sides together. Then you can place the stacked coils either side against the skin. (it is magnetically symmetric, both sides are essentially identical)
If I ever suggest something different (and rarely but occasionally I do), it is the result of a lot of calculus and hundreds of hours of testing; it would be impossible to explain it in ASCII text. But I have tested it, and I know it works, even if it is too complex to explain.
About the nuance of different coil configurations on EMP. Apologies in advance if I am a bit too brutally honest, but honestly is in very short supply in the world of PEMF, so that’s what I stick with.
It’s not really an EMP in the usual sense of the word (though technically it is), and the magnetics are fairly simple but change rapidly.
Philosophically using PEMF this is sort of like driving a car: you do not need to know about the details of computational thermo-fluid dynamics of combustion of aerosolized liquid hydrocarbons to drive a car. I mean, honestly, the last time you had surgery, did you discuss the exact alloy and temper of the surgical blades they intended to use during the surgery. Of course not. But strangely, when dealing with PEMF, people understandably think they should know all of the technical details, and this is because PEMF marketers trick them into believing they have a scientific secret to tell them. Usually it is a secret “frequency”, or a special amount of “Gauss”.
All of the false claims and misinformation on the Internet related to PEMF are intended to give people a “sciency” feel of intellectual satisfaction, to sucker them in with this false sense of understanding, so their over-priced products are easier to sell.
The reality is this: PEMF is way to complex to discuss here, and mostly it remains a total medical mystery. This is OK; many things in medicine are a total mystery, such as anasthesia:
Occasionally someone claims they solved the mystery, but read in detail: they did not. They just found another molecule. They did not solve the mystery. Here is why: anesthesia prevents the consciousness and memory of pain. And we have really no Idea how memory or consciousness work, so understanding how anesthesia works is utterly impossible. Yet we use it safely hundreds of millions of times every year, and it is one of the great pillars of modern medicine. Modern surgery, for example, would be impossible without anesthesia.
PEMF is analogous to this. You could know everything there is to know about electromagnetism, and still not really understand how that relates to biological processes. So, to really help you in a practical way, we need to firmly stick to the basics. It’s best if you just follow my guidelines without trying to get too much into the details of the nuance of PEMF.
Nonetheless, I have published a lot of that information in the form of hundreds of YouTube videos and many scientific papers, so you could always refer to those if you really want to look at the details of PEMF. But still, no one really understands it. And that’s the honest truth.