I didn't get that one, but bought an industrial power conditioner a while back. It hummed so loud that I had to return it to the seller. It was a tough lesson because it was about 50lbs. and I had to pay shipping back to California.
Tried everything to deaden the hum, insulation in the case, tightening the screws and using loctite, etc. Nothing worked. It sounded like 1000 bees were encased in a steel box. Not good. Also, the seller said it ran "Quiet"...although his version of quiet and mine were a long way apart.
Good luck,
Jack