Denon AVR-X6800 Owner's Manual page 288

Contents Connections
Dolby Atmos, Dolby TrueHD, DTS-HD, Dolby Digital Plus audio is not output.
Make HDMI connections. (v p. 76)
0
Check the digital audio output setting on the connected device. On some devices, "PCM" is set by default.
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DTS Neural:X mode cannot be selected.
DTS Neural:X cannot be selected when using the headphones.
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Dolby Surround mode cannot be selected.
Dolby Surround cannot be selected when using the headphones.
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IMAX DTS:X cannot be selected.
IMAX DTS:X and IMAX DTS cannot be selected but DTS:X and DTS can be selected, when the headphones are used.
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Sound modes other than "Stereo" or "Direct" cannot be selected.
Only "Stereo" or "Direct" can be selected for the sound mode if Headphone:X signals are input.
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Audyssey MultEQ XT32, Audyssey Dynamic EQ
®
These cannot be selected when you have not performed Audyssey
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Switch to a sound mode other than "Direct" or "Pure Direct". (v p. 143)
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Audyssey Dynamic EQ ® , Audyssey Dynamic Volume
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that have "+ Virtual:X" in the sound mode name.
These cannot be selected when using the headphones.
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Front panel Display
Playback Settings
, Audyssey Dynamic Volume
®
® Setup. (v p. 215)
® and Audyssey LFC™ cannot be selected when sound mode is "DTS Virtual:X" or sound mode
288
Rear panel
Tips
and Audyssey LFC™ cannot be selected.
®
Remote Index
Appendix