I second what ShadyJ said, Audyssey is choosing the distance based on any DSP delay and in turn adding distance for the correct phase & time alignment. I run 4 subs through a MiniDSP 2/4HD and all 4 subs are 9’ from my MLP but Audyssey XT32 sets them at 15.4’, when I go to REW and check my phase and time alignment they’re already set at the correct distance. It actually does this fairly well as I’ve added additional delay via the MiniDSP and each time Audyssey will in turn add additional psychical distance when I run it through the Multi EQ app.