From what I've read, you're OK if you are just floating one ground but it's dangerous to float them all.
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One alternative is to run all your components through one dedicated outlet. There is no chance of differential in ground then. Of course you'll need to make sure the one line has enough power, possibly a 30A line.
I originally had two 20A dedicated outlets installed, after I tired of chasing ground loop hums and placing cheaters on expensive power cords, I had one outlet re-wired for 30A, no more cheater plugs or buzzing.
It's completely safe, UNTIL YOU DISCONNECT YOUR INTERCONNECTS. The floating component may then kill you, if everything goes wrong a la Murphy's Law.
The ideal is for every component to have a ground-lift switch, which keeps the case grounded while allowing the circuitry to float. This is much easier to do when the component is being designed, rather than after the fact.
Get a balanced power unit from Equi-tech, ExactPower, or Balanced Power Technologies. You'll never have anymore noise. You won't have to lift any grounds. You won't have to use any other kind of power conditioning/filtering equipment. The music will be more detailed with a lower noise floor (especially with analog). Your digital equipment will still introduce RF into the line, but some of the BPU's (ExactPower) incorporate digital filtering into their units. It's definitely the way to go. And if you live somewhere (an apartment, like I do, or even your own house) and you can't put in dedicated lines, try ExactPower's power regeneration unit in combo with their BPU. You'll love it!