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3 REPEAT THIS PROCESS FOR EACH SPEAKER IN TURN
Pressing master will move the cursor (and the noise) on to the next
speaker. When adjusting the subwoofer level, be sure to get up and walk all
around the listening area, watching for the magnitude of the variations in-
troduced by room modes at low frequencies. If more than 3-4 decibel
variations are seen within the listening area, consider re-locating your
subwoofers for more consistent results. (See Planning Your Installation for
specific suggestions on subwoofer placement.)
4 MAKE A NOTE OF THESE SETTINGS UNDER “YOUR SYSTEM SETTINGS” IN
THE BACK OF THIS MANUAL
Having these settings handy will prove helpful should anyone ever tamper
with your careful calibrations. Of course, you should re-calibrate the system
whenever changing amplifiers and/or speakers, or when something has a
noticeable effect on room acoustics (such as re-arranging the furnishings).
5 PRESS ENTER TWICE TO SAVE YOUR CHANGES
Since these settings are critical to achieving optimal performance from your
PAV, the on screen display will ask you whether you are sure you want to
make these changes, and tell you to press menu to escape without saving
those changes. Assuming that you do wish to save your changes, press enter
a second time to confirm and save the changes.
Setting the Surround Delay All Dolby Pro Logic decoders incorporate a delay to the rear speakers. This delay
takes advantage of the precedence effect, whereby we tend to localize on the first
sound we hear when being confronted with several similar sounds (as in the
case of surround sound, or a visit to a reverberant concert hall). The rear signal is
delayed somewhat to ensure that we never hear any potential leakage of the front
channels into the surround speakers, despite the fact that the latter are often
closer to the seating area than are the main speakers. This delay gives the sound
coming from the front speakers a chance to reach the viewer before the sur-
rounds are heard. It can be varied from 15 to 30 milliseconds.
The best setting depends on the distance between the main seating area and the
front speakers, and the distance between the main seating area and the surround
speakers. (See below.)
1 MEASURE THE DISTANCE IN FEET FROM THE FRONT SPEAKERS TO THE
PRIMARY LISTENING POSITION
This number represents an approximate measure of the time it takes for the
front speaker sound to reach the listener, in milliseconds. (Since the speed
of sound at sea level is 1130 feet per second, sound travels approximately
one foot per millisecond—close enough for this sort of work, anyway. Simi-
larly, people using the metric system may use the approximate conversion
of 3 feet = 1 meter.)
2 SUBTRACT THE DISTANCE (IN FEET) FROM THE LISTENER TO THE REAR
SPEAKERS
This difference represents the time “advantage” the rear speakers have over
the front speakers, measured in milliseconds. Since they are usually closer
to the listener than the front speakers, it is important for their signal to be
delayed.