It is very important to make sure the master power switch is powered "OFF" when switching the unit from "opr" to "srv" mode.

Also, if your surrounds are being recognized as "large", than the crossover setting is too high. If there is too much activity below the selected crossover point for an individual speaker, the auto setup system will inform you that that speaker is "large". The correct course of action is to lower the x-over setting before running the auto setup.