It's an inexpensive isolation transformer. Thanks
shkong78 for recommending it in these forums! I understand now. It delivers!
http://www.amazon.com/gp/product/B00R5CDG8O/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 It has "transformed" the performance of my Nuwave DAC and unlocked the potential of my Klipsch speakers into a more intimate, alive, and powerful sound, with new transparency, clarity and imaging.
I've owned higher quality power products in years gone by, Shunyata Hydra, PS Power Plant, Purepower regenerator, PS Ultimate Outlet, even a Oneac power conditioner, but didn't understand how to use them properly. I learned the hard way that these devices are not meant for use with amps where they blunt the SQ. Should have limited their use to front end gear like DACs yes!! I have the Nuwave plugged into the isolation transformer by itself. That has made the sound of my system almost unrecognizable (in a good way). For me, this is one of the audio best buys! This one surprised me!