i have the same problem.my subs are 10' away from the listening position and they keep coming up as 25' on the autosetup.i just figured because there is an open door in the room the mic is picking up the bass pulse down the hallway.i always just change the setting to accual distance but have never tried listening to them at the 25' setting...i may just try that.

my subs only have zero or 180 phase and i have tried both at 0,both at 180 and they come up the same distance.i have even tried one at 0 and one at 180 but they didnt sound right so i didnt even run the setup in thoes positions.