I tried to select the 2x12 front, and simply did not show any of the following options (2xfront 12,pwramp 2x12, 4x12 and 4x12 front pwramp). He had a time that did not change the setting butremember these options available. Someone tell me what's going on? Thanks.
Note: I'm not using input from headphones.
I believe the options changed slightly in an update (I assume you updated). Look at pages 3.3 to 3.5 in the version 3 manual. You now have Combo Front, Combo Poweramp, Stack Front and Stack Poweramp as the options.