I have the same problem with the auto setup - it fails saying my surrounds are large and my fronts are small. My surrounds and fronts are actually identical (small). I tried disconnecting my backs since they are different w/ a different frequency range, but it still failed. I tried activating the x-over on my sub thinking maybe that was throwing it off, but it still failed. One thing I noticed while the auto setup was doing its thing, it was setting the delays correctly, but the trims were way out of whack, compared to me doing it manually w/an SPL meter. I even tried orienting the mic vertically, facing back wall, front wall, etc, to no avail. Not a big deal but still kind of weird.