Calibrate Panorama - Lexicon DC-1 - REV 1 Owner's Manual

Installation and
Calibration
DC-1 Digital Controller
Center Delay
In most setups, although the left and right speakers are about the same
distance from your listening position, the center speaker is often closer to
you, causing the sound from the center speaker to reach the listening
position earlier than the sound from the left and right. Equalizing the
distance to your ear from the three front speakers in the system will improve
the image. The CENTER DELAY parameter allows you to electronically
time align the center channel with your main speakers. The delay (relative
to the main left and right channels) can be adjusted between -5.0ms and +9.5
ms in 0.5 ms increments. To get the correct setting by ear, listen for a strong
improvement in the imaging and stability of the soundstage.
Alternatively, you can measure the path length difference, and calculate the
Set CENTER DELAY to 2ms.
correct setting. To do this, measure the distance (in feet) from the tweeter(s)
of your main speakers to your primary listening position. Average these
two numbers. Measure the path length from the center speaker to your
listening position, and subtract this distance from the average path length
of the main speakers. Set CENTER DELAY to the same number of millisec-
onds as the number of feet of path length difference. For example, if the path
length of your main speakers is 14', and the path length of your center
speaker is 12', set the delay to +2ms. If the path length of the center speaker
is 15.5', set the delay to -1.5ms. This adjustment globally affects all modes
which use a center channel.
Set CENTER DELAY to -1.5ms.

Calibrate Panorama

Panorama works by canceling the sound going from each speaker to the
opposite ear. Its effectiveness is highly dependent on the geometry of your
front loudspeakers, the room and your listening position. The correct
timing of the canceling signal varies with the relative angle between your
main speakers.
Find a mono source, such as an announcer on FM radio or a mono film, and
listen for a tightly focused center image of speech or singing. If the image is
off-center, adjust the DC-1's input balance controls. (The more centered the
monaural image, the better Panorama will work.)
Select CALIBRATE PANORAMA from the Listener Position menu to
display a sub-menu that allows you to turn on a calibration noise source,
configure the speaker angle, and adjust the listener position.
CAL NOISE is a special digitally generated signal to aid in calibrating the
Speaker Angle and Listener Position parameters. Note that in all cases,
sound will actually be produced by both front loudspeakers. The adjust-
ments affect the perceived directionality of the sound.
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