First no, none of them require earth ground. They have the third ground but not a one of them requires it. In fact they will as you already seem to understand only be noisier if connected to another wire going to ground.
Matter of fact, Mike Smith of Fidelium was just at my place recently for Chuxpona and saying the exact same thing. In fact he carries around a cheater plug to prove his point. So there.
Probably you will reject this correct and useful advice. This always happens. So what you do then is establish your own earth ground with a ground rod, run a wire up into the room, connect it to a grounding box (fancy term for a bus bar) and ground your gear into that.
We now return you to our regularly scheduled yada yada.
Matter of fact, Mike Smith of Fidelium was just at my place recently for Chuxpona and saying the exact same thing. In fact he carries around a cheater plug to prove his point. So there.
Probably you will reject this correct and useful advice. This always happens. So what you do then is establish your own earth ground with a ground rod, run a wire up into the room, connect it to a grounding box (fancy term for a bus bar) and ground your gear into that.
We now return you to our regularly scheduled yada yada.