Game Changing Tweak

@lostinseattle -

I'll try to explain it (ElectraClear) in general terms - 
Consider the idea of a clock and dividing its rate or frequency into slower and slower rates. Now the clock has to be a fast rising edge, like a pulse, so as to trigger the dividing process. The outputs are square wave signals.  What is a square wave? If you look up Fourier and his discovery of harmonics and transforms, you will learn that they are comprised of sine/cosine waves of a variety of related harmonics to the fundamental.

I presume that there is a situation that mirrors or reflects the pulsing action of a square wave onto the AC line however minute that may be.
This mechanism eludes me.But it must be something in the semiconductor transistor output or the small em field generated that allows this transfer. Not sure here.
Accepting this -
This is a pulsing event and not "ripple" but more of a defined square wave form of very small amplitude and lower in frequency(s) than 60 Hz. If this activity gets reflected onto the AC line then it is likely that it will not be filtered completely by power supply filters. What we're talking about is sine waves of a harmonic relationship extending to, mathematically speaking, infinity per Fourier. The frequencies of this harmonic series in the audio band will be present on the voltage reference, the DC voltage reference. This means that the DC line contains some harmonic information, albeit small. But small goes a long way.
An increase of 0.1 volt change from 1.0 v is 1.1 v and is equivalent to a gain of 0.83 dB.
Now the idea of resonance is vibrating at a similar or like frequency.
When this happens there is an energy transfer or increase in beats ala a tuning fork when in resonance with a like frequency.
Like that, the harmonic resonates with a similar or like frequencies in the audio amplifier. There are many harmonics in the square wave form so they too, will resonate with whatever frequency(s) come into the amp.
What you here will be an increase in harmonic information as the signal passes through the amplifier to speaker.

"Generally, audio power supplies do not filter noise under 40 kHz, no?
You can put all the LRCs you want on a DC power supply and as many farads as you want. I will say that you will not find many supplies filtering under 20 Hz."

My goodness. Setting aside for a minute the absurd contention that injecting a low frequency AC harmonic that transmits through the supply is somehow helpful, from where comes the learning that a power supply cannot filter low frequencies? The first stage of the supply is a full wave rectifier - either a four diode bridge, or two diodes with a center-tapped transformer. The bridge does not care the frequency. When the voltage is positive relative to its bias, it conducts. When negative, it does not. It will rectify a 1 Hz sine wave just as happily as a 60 Hz sine wave. This is my last comment on this as the futility is obvious. P.T. Barnum was a smart man. If I were to spend money on Add-Powr, I would think it more beneficial to buy the company’s stock than its product.

There’s an account of an applicant for an opening in Thomas Edison’s research lab. Edison himself conducted the interview over a bowl of soup during lunch. The job candidate proceeded to add salt to his soup without tasting it first. He did not get the job.

OK bartholomew. Lets run an experiment. You have to be blindfolded and sitting in your listening position. Have a friend or your wife plug and unplug the unit. All he or she can say is "OK" when they make a change. You say "on" or "off" after every "OK" That person keeps a record of your responses by writing down R for right and W for wrong. Record 50 responses then determine the percentage of right and wrong answers. 
Let us know the results.  

A simpler solution to the controversy is for anyone on this forum to call the company and confirm a money back guarantee from AddPowr. Then you, trusting your own ears, can decide for yourself whether to keep or return the Electraclears. I was told by the company that I could return them for a full refund. I'm keeping them.