the nrg are not particularly advanced you will hear a difference upgrading to a storm series cablr the huurricane is very good
we tested the niagra 7000 vs a few other conditioners we ended up returning it the audio magic conditioners sounded substantially better
please call our shop we have tested most of the units on the market
we sell isotek, clarus, audio magic and audience
Dave and troy
Audio intellect NJ