Symphony Pro PS-1 Harmonic Resonator. Asset or snake oil?

Just mediocre sound I would certainly pass big time.

@ebm Did you try it?

No email.  
Probably?

Personally, I don’t bother much with tweaks.  My systems already sound fantastic to me.  I would rather spend the money on new music I have never heard before, makes me a little more diverse.  The only tweak I use that really made an audible difference are the GAIA II footers I use under my speakers. 

Thanks all.
To me, it reeks of snake oil... just wondering if, to my surprise, anyone had any experience with such a device.

An asset big time! Easily a major upgrade that exceeds any cable upgrade at 1/3 the price. It adds more clarity and fullness to the sound.
Definitely adds harmonic resonance.

Definitely not snake oil. Just got mine today and I noticed an immediate bump up in clarity and 3D soundstage as advertised!!

Got two of their plug-ins and was impressed.

I should have searched Audiogon before posing the question.
It was a topic in April of this year.
https://forum.audiogon.com/discussions/i-have-had-the-add-powr-wizard-in-my-system-for-a-couple-of-w...

Yes, ADD-Powr harmonic resonators are definitely the real deal.
Excellent products offered at a fair price, along with excellent service.

No one understands what harmonic resonance is. Maybe this would be a good starting point for anybody selling this product. Absolutely horrifying.

jumia"No one understands what harmonic resonance is. Maybe this would be a good starting point for anybody selling this product. Absolutely horrifying."

Please explain why you are horrified I hope you are not too frightened I am sure some here will be able to help you please reach out.

A clear explanation is found here:

 https://www.physicsclassroom.com/class/sound/Lesson-4/Fundamental-Frequency-and-Harmonics

ADD-Powr is making a claim or an assertion partially based upon this and the Fourier harmonic series: 

https://en.wikipedia.org/wiki/Fourier_series#:~:text=A%20Fourier%20series%20(%2F%CB%88f,be%20determined%20using%20harmonic%20analysis.

They also have a useful animation video that attempts to explain their idea.