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Sounds like the speakers are wired in such a way that is lowering Ohm below supported levels. I'd attach a single pair of free-standing 8 Ohm speakers to check for sure.
Sorry, there was a problem. Please try again later.Hi, JM! The speakers might be incompatible with the AV receiver. You can only hook up speaker system that supports 6 to 16 ohms of power impedance. If PROTECT or PROTECTOR appears on the display, there may be an external speaker issue or connection issue that is triggering the protection circuit. Visit this link below for more information regarding your concern. https://www.sony.com/electronics/support/articles/00025095 Happy to help, David
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