Hello Tim.
If you plan on having this receiver set up 5 channel or greater and have a subwoofer, there is a neat little option to make your music come alive if you have large (yet small) fronts, but that have smaller drivers like mine(Auto setup showed Large but bottom end is a little light, this affects the way the auto setup sets up the SUB)
It's a Subwoofer option, and it can be set to take the bass from the rears or from the rears and fronts (when your auto setup detects large fronts it defaults to just the rears)
Setting is as follows: (The following is based on plugging in the SUB to the Sub out pre MONO connection not anything else. It might be the same but I have not tried it)
Press the "Menu" button on the remote (I use the non LCD screen remote the LCD one I found was rediculous)
Go to "Manual setup" press >
then go to the "Speaker setup" press >
Then go to the Supwoofer mode, press > and set it to LFE + Main
That made my sound come alive! The wife had commented that while listening to some MP3's it was tinny. So i started to look around because the Sub was not on in the Stereo output mode.
I have been playing with this 3808 for a couple weeks and I only found that option this morning

...I never read manuals. Playing with the functions is so much more fun.