I just removed my isotek evo 3 polaris for a $75 hospital grade power strip and the faint hum in my subs disappeared.
The main reason I decided to get rid of it was the blades in the isotek inlets are crap - all the plugs were loose.
I'm ordering this to replace the power strip https://www.cullencable.com/gold-series-power-box-6-outlet-receptacle-strip/
You can probably get one made with a longer cable if 4ft isn't enough.