Auto-cal and all it's whiz-bang technology aside, one should reasonably be able to hear an out of phase pairing of the FL and FR.
If your room and system(FL+FR) placement allow, with the SP PATTERN set to 2.0(only FL+FR), place yourself centered between and at equi-distance out front of the FL and FR and listen to a bassy 5.1 encoded source. The sound you hear should itself be sonically "centered' between the two speakers. Like your eyes can actually focus on where the sounds are emanating from between the two speakers. Not sounding as if it is coming from behind. Or that eery "inside your head' , WTF sense/feeling.
Also, the below is copied from the 1010's manual. Again, I believe it represents what the mic is "hearing' sonically due to room, furnishings, and or system placement. Whiz-bang.
Do the simple test above first. Given the mic vs human ear, I'd vote human ear.
pg 41 of the available online manual I have here states:
*When the speaker(s) is (are) out of the phase, OUT is displayed on the TV screen. The + and - terminals of the speaker may be connected the other way around. However, depending on the speakers, OUT appears on the TV screen even though the speakers are connected properly. This is because of the speakers' specifications. In this case, you can continue to use the receiver.