Not sure if the 990 uses "white noise" for speaker calibration but I had the same experience using the 990 test tones vs. using my DTS or AIX test tone calibration discs. Using the RS meter and the 990 test tones gave numbers that were completely different than the DTS or AIX discs I used. For some reason, when I used the built-in mic of the 990, then the speaker levels were the same as the DTS or AIX discs. Only the subwoofer level was too low. Had to boost it 4dBs so it could better match the mids and highs. Wish Outlaw would hurry up with the firmware fix of having the 2 channel sub go into the positive range.