Only Air. I did try doing a system reset, but the problem is consistent. Its no biggie, since I just grabbed by trusty radio shack meter and did it by hand. I just wondered if anyone knew what the 990 was looking for that might cause it to make this determination - especially since the subwoofer seems to be the determining factor. Does the 990 somehow check speaker size using the SUB? I would have thought it would have been determined just the test signals on each speaker..