The 3808 must be different than my 2805. You set the speaker settings how you describe above, however, this applies to all modes on the denon; standard, stereo, direct, etc.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85