Get a few of these and daisy chain them together and voila, plenty of conditioned power without worrying about a ground loop (ground loops introduce hum into your system)

This got rid of ground loop noise that was being transferred from my desktop Mac to my studio monitors

These are made of excellent quality, and they get rid of ground loop hum.

I had tried the Hum DeBugger from ElectroHarmonix, the Ebtech Hum X Ground Loop Eliminator, new cables, old cables, etc to no avail.

No published specifications on clamping voltage (for any leads, L-N-G), no published specs on total Jules of surge protection, no master off feature, no info whether it cuts power after surge protection is over