The term Subtle Energy (SE) is of recent origin. SE could mean a physical energy, such as electromagnetic or acoustic, that is of such low intensity we have no means of measuring it presently. The sensors we have designed in the laboratories are not sensitive enough to directly discern these fields. In this definition of SE, we are dealing with a physical field which is of very low magnitude. 
Several scientists in the United States (Tiller, Bearden, Rein, Putoff, Green, and Srinivasan) have studied SE and its effects. Though each has developed his own nuanced theory of SE, in general they all tend to concur that SE phenomena is related to a type of unified energy, and is not just a physical field of very low magnitude. 
Contemporary quantum physics has mathematically described and predicted the presence of a unified energy which underlies conventional transverse electromagnetic (EM) vectors. The concept of a subtle energy underlying EM fields was first introduced by Bohm and Aharonov in describing quantum potentials as an implicate order "embedded in" our normal 3-D space. It has recently been proposed that an additional implicate order is embedded within the quantum potentials.
This higher-dimensional space is composed of an energy, which has been called time-reversed waves, non-Hertzian waves, longitudinal waves, scalar waves, or zero-point energy. 
The classical EM fields have been under investigation since the laws of Maxwell were established more than 150 years ago in England. We know all about the physical fields; we can generate, manipulate and use them for purposes such as long distance communication, computer applications and measurement techniques that are proliferating all around us. However, our knowledge regarding SE fields is expanding slowly. We present below a view of SE field generation based on some of the latest theories in quantum physics. 

Physics Of Subtle Energy Fields - ZPE
 Subtle Energy fields might be a fundamental manifestation of energy that underlies classical energy systems. We need to invoke current theories in physics to postulate possible scenario for SE production. It is known that what we thought of as vacuum or empty space is not really so. Quantum theory predicts this vacuum is really a container of enormous amounts of energy. Particles seem to appear and disappear out of this vacuum. Such processes are presently called Zero Point Fluctuations (ZPF), providing an infinite energetic background for the physical world. 
The manifestation of elementary particles from this vacuum and their disappearance proceeds continuously and is postulated as the basis for the formation of the universe as we know it. At the level of ZPF, Zero Point Energy (ZPE) is converted into matter and matter falls back into this ocean of ZPE. If we can 'mine' even a small part of this vast energy, we can theoretically supply the energy requirement of the world for a fraction of the cost of conventional energy sources. Renowned scientists, several of whom seem close to extracting this energy, are making attempts at this. 
Now, one might ask, how is this ZPE connected with SE? It is likely that as particles are formed from vacuum (which as we said, is a concept emerging from quantum physics) there are associated radiations. As particles emerge and disappear, these radiations also appear and disappear. It is similar to when ripples are formed as stones are thrown into still water. As each stone disappears in water, it produces waves at the surface of water. Though there is no mathematical proof for production of SE through this method, it is likely such a mechanism exists in the vacuum state. Quantum mechanics postulates elementary particles do have specific energy states, which have certain finger print radiation patterns. Hence the above model for subtle energy radiation's is well within the possibilities of theories in modern physics. 
While the production and radiation of SE fields could possibly be within the realm of physics, the design and use of SE field devices most likely require novel engineering constructs. It is likely these SE fields can be focused and down-converted through special energy-information transduction techniques which couple the multi-dimensional SE fields to three-dimensional force fields. 
It is likely, then, if SE fields are focused, they can be brought out from the Zero Point Energy itself. As SE fields emerge out of ZPE, they may be beyond physicality (and hence not possible to measure); however, after transduction, they seem to manifest as quasi-physical energies. Or they directly influence the behavior of classical field phenomena. After such a change in energy format, SE fields become 'useful' and take part in energy interactions with physical fields such as electromagnetic and acoustic. 

Subtle Energy Device Dynamics - Prof. Tiller Theory
While the above thoughts could very well be mere speculation which could face premature mortality as physics advance, we need to ponder over these ideas with the backdrop of a particular instrument which seems to fall within the category of SE field generation and its interaction with the physical world, especially with electromagnetic and bioelectromagnetic phenomena. 
There are a set of SE instruments devised by Clarus Transphase, L.L.C. and its affiliate company Clarus Products International, L.L.C. These devices are called Sympathetic Resonators (SR) and use Clarus's proprietary Sympathetic Resonance Technology (SRT). A brief report is presented regarding these devices which have undergone many laboratory trials and seem to produce consistent and measurable changes in both physical and psychophysical systems. 
The Clarus devices consist of a family of hardware platforms. Each hardware platform has certain formats imprinted in the electronic or non-electronic circuitry such that transduction and coupling of SE fields to physical phenomena is achieved. These formats are delivered via the proprietary "Sympathetic Resonance Technology" (SRT) developed by Clarus. Clarus has developed the capability to generate an almost infinite number of variations of subtle energy fields using SRT. It has been found that different types of SE fields are suited for specific applications. Testing has also shown that the SE field intensity falls off as Inverse Square of distance; in other words, they have a radius of action beyond which their efficacy reduces. 
Because the SE fields cannot be measured directly, the effects of the Clarus Sympathetic Resonators on physical and psychophysical phenomena are being tested. Once the SE field is generated and coupled to a physical field, or application, its effects are then studied. 
An overview of the theories proposed by Prof. William Tiller of Stanford University (former Chairman of the Materials Science Department and Guggenheim Fellow), who has worked extensively with Clarus, provides a more detailed explanation of the possible mechanism of causation. 
Prof. Tiller has proposed that magnetic vector potentials are the means by which energy exchanges occur between subtle energy fields and the physical world of electromagnetics. It is likely that the energy generated through magnetic vector potentials from the fundamental ZPF is 'pure', and can influence fields and matter around it through resonance effects. 
Resonance occurs when two objects have frequencies of oscillations that are close to each other. When two such systems are in proximity, then they will resonate at the frequency dictated by the stronger of the two oscillations. For example, when a string in a guitar is plucked, any string, which is at a nearby resonance, will start oscillating at the driven frequency. 
Similarly, the strong oscillations at the fundamental ZPE level will couple with other material oscillations and organize them to its proper frequency. Further, the ZPE generated field is considered coherent. In other words, a pure noise free field is radiated from the Clarus SE transducer. This would serve to bring electromagnetic phenomena to a new coherent order with less fundamental noise within the vicinity of the Clarus SRT devices. 
Thus, resonance and coherence are two important aspects of SE fields. The physical field that emanates from the SE device is highly coherent and induces resonance in material objects as well as electromagnetic force fields around it. The property of coherence is important in many systems, including the psychophysical. For example, information is transmitted across junctions in the human nervous system because of coherence. Even at the gross level, activities such as speech, movement of limbs and other functions are possible because of a coherent behavior of many subsystems. We can see the effects of loss of coherence in diseases such as Parkinson's and spasticity. 

Tiller summarizes the four ways subtle energy and thus a Clarus SRT device can relate to and influence classical electromagnetic phenomena: 
(1) Subtle energy may directly influence the ordering of fundamental magnetic properties, which would regulate the fundamental magnetic behavior of all electromagnetic fields in the range of the subtle energy device. 
(2) Subtle energy may be related to magnetic vectors, such that the vectors serve as the media whereby the properties of subtle energy are able to impact electromagnetic phenomena. 
(3) Subtle energy may be the rarefied form of magnetic vectors, or one and the same phenomena. 
(4) Other properties of subtle energy may exist that impact sub-atomic particle phenomena through quantum field interactions, and thus they would indirectly influence forces such as magnetic phenomena. 

If the magnetic vector were used as a medium or vehicle to store and transport and disseminate this energy, it would carry the new magnetic value to the electromagnetic phenomena in the environment, most likely through the mechanism of resonance. The same result would occur if the magnetic vectors were physical attributes of non-physical subtle energies, as if they were the flip side of the same coin. 
Because electromagnetic radiation is composed of both an electric component and a magnetic component, the electric component will be always be directly affected by magnetic shifts. This is based on the principles of magnetics, where magnetic fields influence charged particles in motion such as photons, the carriers of electromagnetic force.