Well again, the power supply - a PS Audio something-or-other - is still grounded. The cheater is between the preamp and the power supply, and the power supply still has a protection circuit, so I think the risk is pretty low. The amp, which is the big power draw, is still grounded.
I might check on the polarity thing though. It couldn't hurt.
I might check on the polarity thing though. It couldn't hurt.