Reducing Humming Sound

Hello all!

I am using a Tripp-Lite LCR2400 AC line conditioner in my system.  I am very happy with it and the peace of mind it offers me with regards to not only protecting my equipment, but insuring the power I'm getting is clean and stable.

This unit is known to have an audible hum to it...it's not very loud, but it can be heard faintly in a quiet room. When playing music, the hum is not noticeable at all.

If I were to attempt to reduce this hum, would opening the unit up and affixing sound deadening material (like Dynamat) to the interior of the case/chasis/cover be a good solution?  Normally, I would go ahead and give this a try, but since there is such a high level of electricity being handled by this unit, I don't want to do anything that would be dangerous once I plug it in and turn it back on.

Thanks for any feedback,

Arvin