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Target Sound Options
1. Choose a Target Curve
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to be used in computing the MultEQ XT Filters
a. Flat – A Flat target curve should be used only in very small rooms, where the listener
is situated very close to the speakers. It is also appropriate in a THX system where
re-equalization is applied
b. High Frequency Roll-off 1 (Default) – This curve introduces a slight roll-off at high
frequencies that accounts for the balance between direct and reflected sound for
small to medium size rooms (room volume less than 2500 cu. ft.)
c. High Frequency Roll-off 2 – This curve introduces a slightly greater roll-off at high
frequencies that restores the balance between direct and reflected sound for medium
to large size rooms (room volume between 2500 and 5000 cu. ft.)
d. SMPTE 202M – An international standard target curve is used for the high frequency
roll-off applied in a typical 500-seat movie theater. It is appropriate for professional
mixing spaces and dubbing stages that must be calibrated for film sound
postproduction. It can also be used in extremely large playback spaces (room
volume greater than 5000 cu. ft.)
2. Choose application of Midrange Compensation – It is recommended that Midrange
Compensation be enabled (default) for initial listening tests. This target curve adjustment is
sometimes useful for correcting the directivity difference that occurs between the midrange
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Target Curves Explained An audio system that reproduces sound with no coloration from 20 Hz to 20 kHz will not always
produce the correct sound when combined with the acoustic response of a room. The main reason for this is that
loudspeakers are much more directional at high frequencies than they are at low frequencies. This change in directivity
causes the balance of direct sound and reflected (reverberant) sound to vary between the high and low ends of the
frequency spectrum. The human ear perceives this imbalance as a “brightening” or emphasis of the high frequencies. A
target curve compensates for this psychoacoustic effect by moderating the high frequency content.
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