SPK-1 AB switch is triggered by a switched outlet. Would have been nice if it were on the AV Receiver but since it isn't I ordered an APC-2. When the receiver turns on the APC-2 will sense it and switch on the outlet that the Spk-1 is connected to and that will cause it to switch from a to b.

I know the above paragraph could use a dozen more words but if you read my other responses you can fill in the blanks.