Denon AVC-S660H Owner's Manual page 181

Contents Connections
No sound is produced from subwoofer.
Check the subwoofer connections.
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Turn on the subwoofer's power.
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Set "Speaker Config." – "Subwoofer" on the menu to "Yes". (v p. 148)
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When "Speaker Config." - "Front" in the menu is set to "Large", depending on the input signal and the sound mode, no sound may be output from the
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subwoofer. (v p. 147)
When no subwoofer audio signal (LFE) is included in the input signals, no sound may be output from the subwoofer. (v p. 152)
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You can make the subwoofer always output sound by setting the "Subwoofer Mode" to "LFE+Main". (v p. 152)
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DTS sound is not output.
Check that the digital audio output setting on the connected device is set to "DTS".
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Dolby TrueHD, DTS-HD, Dolby Digital Plus audio is not output.
Make HDMI connections. (v p. 38)
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Check the digital audio output setting on the connected device. On some devices, "PCM" is set by default.
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Dolby PLg mode or DTS Neo:6 mode cannot be selected.
It cannot be selected when "Speaker Config." - "Surround" is set for "None". (v p. 148)
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Dolby PLg or DTS Neo:6 cannot be selected when using headphones.
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Audyssey MultEQ ® , 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". (v p. 89)
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These cannot be selected when using the headphones.
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Front panel Display
Playback
® and Audyssey Dynamic Volume
® Setup. (v p. 137)
181
Rear panel
Settings Tips
® cannot be selected.
Remote Index
Appendix