In 3D Surround mode, the front left and right channels sizzled strongly, leaving the center and surrounds noticeably softer (but more palatable). The surround channels stepped 2 or 3 feet from the bar toward the listening position, with the left-surround channel stepping a few inches farther — probably due to my asymmetrical speaker placement, with its differing side-wall distances. The virtualizer managed to lift the height channels a few feet above the bar — nowhere near the ceiling, but definitely upward. Again, the effect was stronger in the left channel. And again, the front height channels had more sizzle compared with the rear height channels, at least with pink noise. But, no one listens to test signals for entertainment, and with program material, especially movies, the tonal shifts were less irritating.