The LFE mix control adjusts the level of the ".1" channel only. The ".1" channel is typically used as a separate bass channel for music and movie soundtracks. However, the sub level control will adjust the output level of both the ".1" channel as well as the summed bass information from all of the other channels (center, mains and surrounds). Contrary to the belief of most enthusiasts the ".1" channel in DVD-Audio soundtracks is actually capable of a 20,000 Hz signal (though most tracks never go higher than 200 Hz).