Denon AVR-X3800H Owner's Manual page 170

Contents Connections
o Subwoofer
Turn subwoofer output on and off.
On
(Default):
Off:
0 You can set this when the sound mode is "Direct" or "Stereo" and in the menu
"Subwoofer Output" is set to "LFE + Main". (v p. 225)
o Set Defaults
The "Surround Parameter" settings are returned to the default settings.
Front panel Display
Playback
The subwoofer is used.
The subwoofer is not used.
Rear panel
Settings
170
Remote
Tips Appendix
Index