[LazyPup]

Someone correct me if I am wrong, but if the existing outlet is not wired with armored cable and they cannot get a ground you can install a GFCI for safety reasons, because the GFCI will automatically switch off if there is an unbalanced amp load from power to common, however, this circuit is being used for electronic entertainment equipment. While the GFCI would provide safety it cannot provide a necessary ground path for the electronic white noise filters in the circuit, which means you would still have problems with static or ghost imagining. In my humble opinion, if the circuit is not wired with armored cable or another suitable means of effecting a ground, the proper solution would be to pull a new circuit from the panel.