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Under the default settings, the Yamaha RX-A780 is configured for 8Ohm speakers. You're unlikely to hurt the speakers, using an 8-ohm receiver with 4-ohm speakers. This just means that for a given voltage supplied by the receiver, the receiver is rated to send less current than it will have to power the 4-ohm speakers, so this is much more likely to hurt the receiver than the speakers. You may contact JBL Synthesis Customer Support if you have other questions and/or concerns. https://bit.ly/3uir2W7
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