I am a bit addicted to these plug in filters and use them for both audiophile and videophile comparisons. I have had the following...
Nordost Qv2
Add-Powr ElectraClear eau4
MIT Predator 6
Alan Mayer Designs
PS Audio Noise Harvester
Audio Magic Pulse Gen ZX (this one not a plug, wired inside a component)
So naturally I will be checking out this new Puron!!
I found all did something positive, but all effect the system balance and do take something away, so its a trade off. It’s not apparent until you remove them what you have lost.
I said all did something positive, not exactly true, the PS Audio noise harvester was the worst product (and cheapest) consistently making my system sound worse wherever it was placed.