Denon AVR-S660 Owner's Manual page 60

Contents Connections Playback Settings Tips Appendix
Listening to audio on Bluetooth headphones
You can listen to audio playing through the MAIN ZONE of this unit on Bluetooth headphones.
Output audio from connected speakers and Bluetooth headphones simultaneously, or only using Bluetooth headphones.
(Output Mode: Bluetooth + Speakers) (Output Mode: Bluetooth Only)
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Front panel Display Rear panel Remote Index