[EC900]

Should be able to “Siri Off” on the device that’s streaming if the option to shut off is not on the PCM unit interface.

“How to turn off Siri: If you find Siri's always-listening capability unsettling, there's good news. With iOS 9, Siri won't be automatically on. You have to activate it, by going to Settings>>General>>Siri. If you do activate Siri, but later want to turn it off, go to Settings>>General>>Siri, turn Siri off. “
– source from Kim Komando

Ah high tech. Who doesn’t miss that flashing 12:00 on the VCR ?