The TRC-Shock Shield protection switch, mentioned above, works perfectly.
When electrical power is removed, the connected device shuts off. When power is restored, the device remains off and the switch on the TRC Switch must be pushed so the device comes back on. Very cool.
Unfortunately, Northern California is having very high winds and our Utility Company (PG&E) May turn off the Electrical power at any time. This warning is for today and Thursday. To be safe, I disconnected my audio system from the power grid.
In fact, the tunnel between Contra Costa County and Alameda County May have to be closed. They cannot allow vehicles to pass with no electricity.