Brian,
That's one way to partially eliminate the hum but it's not considered the best option because you bypass the grounding of the said component which can, by itself, cause a lot of problems.
The other way is to check the actual ground on the outlet that the amp (or other component) is...
Joe,
There has been some mention of a slight hum with the S1000 (do a search on S1000 for additional info).
It won't damage any of your equipment but it can be a nuisance.
Troy