Spoiler - Wow, that is weird! On the 3806 you can set LFE+Main when mains are set to small (that's how I have mine set).

Jason - It is interesting that you are getting full range to your mains in this mode. Are you sure?

I am starting to believe that depending on what model of the Denon AVR you have, it acts differently...

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7