I got my Anthem MRX 700 installed by a pro when setting up the ARC software 2 years ago. Upon checking the settings, I recently noticed that the selection for the floor standing speakers was set to "large" speakers even when the receiver was hooked up to a subwoofer. Shouldn't it set to "small" speakers when connected to a sub? If so, what shall I do to set the speaker selection to "small" instead of "large"? Thanks.