A:AnswerI use the Onkyo sub but Polk and Yamaha also work. Onkyo turns on when it detects the receiver, receiver protection circuit detects the sub. Good Dolby setup.
A:AnswerHi Joyce, it has an Auto-Standby feature. To know how, please visit the link below. Thanks! ^Ron
https://helpguide.sony.net/ha/strdh7555/v1/en/contents/TP0000242721.html