I read in the article that you posted AmericanAudio and here is what I found in there:
NEVER, EVER use devices such as 3 to 2-prong ac plug
adapters, a.k.a. "ground lifters," to solve a noise problem!
Such an adapter is intended to provide a safety
ground (read the fine print) in cases where
3-prong plugs must be connected to 2-prong
receptacles. If a proper safety ground isn’t
available, always use a ground-fault circuit
interrupter or GFCI. A GFCI works by sensing the difference in current
between the line and neutral conductors. This difference represents current
in the hot conductor that is not returning in the neutral - the assumption is
that the missing current is flowing through a person. If the difference reaches
about 5 mA, an internal circuit breaker is tripped. The GFCI shown at left is
unusual because it has a retractable ground pin that allows it to be used with
a 2-prong outlet. [5]
Consider two devices connected by a signal cable, each device having a 3-prong ac plug. One
device has a ground “lifter” on its ac plug and the other doesn’t. If a fault occurs in the “lifted”
device, the fault current flows through the signal cable to get to the grounded device. It’s very
likely that the cable will melt and burn! Defeating safety grounding is both dangerous and
illegal - it also makes you legally liable!