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• THX setup sends you to a screen in which you can configure some THX-specific
features.
Specifically:
• THX Ultra 2 sub should be engaged if you are using a subwoofer that is
certified by the THX Ultra 2 standard. Such subwoofers are essentially flat
to 20 Hz under what might be considered worst-case acoustic conditions for
bass, and have prodigious output capability. If you select the THX Ultra 2
sub button, you will also notice that the otherwise grayed-out boundary gain
compensation button becomes available. (See below.)
• ASA stands for Advanced Speaker Array, and engages a proprietary THX
technology that provides outstanding flexibility and performance in your
surround sound array. This button will take you to a submenu in which you
specify that your rear speakers are together (less than 1 foot apart), close
(between 1-4 feet apart), or apart (more than 4 feet apart). In an ASA surround
system, the ideal situation is one in which the rear speakers are almost touching
each other, and you have selected together. This allows the ASA processing to
create the most seamless and versatile surround sound field.
• boundary gain compensation will adjust for the fact that most of us do not suffer
from the worst-case acoustic scenario that THX Ultra 2 subwoofers can handle.
If you have such a subwoofer, and it is placed within 3-4 feet of at least one
wall, engage the boundary gain compensation. It will correct for the acoustic
reinforcement your room is providing to the subwoofer in order to yield the
flattest, most accurate bass.
• positions 1-4 are the menus in which you can create and recall families of
speaker level and distance measurements for later use. You might have one
position defined for the seating arrangement used for standard movie viewing,
and another for when you are sitting by the window reading a good book.
Positions can be enabled or disabled as required by going to the system setup/
speakers/position menu. If the position in question is highlighted, it is available
for use. If it is not highlighted, it has been disabled to prevent accidental use.
• The name of each position can be specified in the same way that sources are.
(See input setup earlier in this section.)