So what is Soul? What is Prana? What is Kundalini? Before I go there, Philosphy wise: Waves in Ocean come and go, but the Ocean stays. The Space before a jar was fabricated, was there, and once the jar is made, the Space is inside the jar. And when the Jar is destroyed, the Space is still there!
So the Individual soul - is something like that. It is the Jiva Atman of the Brahman/Param/Shiv Atman - or Super Soul.
The Universe is unaccounted of 74% of Energy by modern Science! So this is not an EMF Energy but people can manipulate the EMF and Gravity when they have Yogic Powers.
This is my research and experience, and also mathematically proven by modern science and me, but not so well understood by most: For now, just assume that waves travel in inversion - of mathematics, of algebra, and geometry. And it satisfies Laplacian and Wave Equations - for those who care to know the Scientific basis.
So Soul is the wave manifestation of this Infinite Pranic Energy which carries memories of past interactions - governed by laws of science and also the basis of consciousness, but survives physical bodies birth and death cycles. It is like a Fundamental Harmonic having Secondary Harmonics but they dying out and the Fundamental Harmonic Still there. Now repeat this iteration taking Individual Soul as Fundamental Wave and then Super Soul as the Fundamental Wave. So this is Scientific.
Soul is the wave of expression of Brahman Principle. Soul and Reincarnation have scientific basis, where data now points but western people have problems understanding it because of "ego centric" view of the material world.
Kundalini is the "inverse" of the Brahman (infinite) - hence represented as Knot and Naught (zero), but when it changes its phase, it becomes infinite and a tremendous Energy is released - like an nucleus exploding - and it kills most of the people. I had my awakening 3 years back, and can be triggered by tremendous stress, and combined with Yogic and Spiritual Practices.
So when the Brahman wave manifests itself as Soul and takes Physical Birth, the inverse of Brahman is manifested as Kundalini.
In this Sense, Kundalini is equated to Shakti - as Energy is the 1st phase of the Brahman principle in evolution of things.
And Brahman is the Shiv principle - the zero'th phase of the principle.