Denon AVR-X4500H Owner's Manual page 287

Contents Connections
Bluetooth cannot be played back
Bluetooth devices cannot be connected to this unit.
The Bluetooth function in the Bluetooth device has not been enabled. See the Owner's Manual of the Bluetooth device to enable the Bluetooth function.
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Bring the Bluetooth device near to this unit.
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The Bluetooth device cannot connect with this unit if it is not compatible with the A2DP profile.
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Turn the power of the Bluetooth device off and on again, and then try again.
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The sound is cut off.
Bring the Bluetooth device near to this unit.
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Remove obstructions between the Bluetooth device and this unit.
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To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.
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Reconnect the Bluetooth device.
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Front panel Display
Playback Settings
287
Rear panel
Tips
Remote Index
Appendix