Performing Time Correction Manually (Tcr)/ Phase Switching; Calculating The Time Correction - Alpine DVA-9965 Owner's Manual

9
To adjust other channels, repeat steps 5 to 8.
10
When the setting is complete, press and hold
MENU for at least 2 seconds.
• When the speaker is set to the "OFF" mode, the X-OVER for that
speaker cannot be set. Refer to "Setting the Speakers" (page 46).
• Check the playback frequencies of the connected speakers before
adjusting.
• In order to protect the speakers, there is no OFF setting for the
subwoofer low pass filter (the slope remains the same).
• The H.P.F. filter cannot be set to OFF (slope OFF) if Tweeter is
selected for FRONT1. Or, only the subwoofer is adjustable if
STEREO is selected for the subwoofer.
• When the setting is complete, it is recommended to store the setting
contents. For storing, refer to page 53.
Performing Time Correction Manually (TCR)/
Phase Switching
Because of the particular conditions inside the vehicle, there can be
major differences in the distances between the various speakers and
the listening position. It is possible to calculate the optimum
correction values and eliminate the time error at the listening position
yourself using this function.

Calculating the Time Correction

1
Sit in the listening position (the driver's seat, for
example) and measure the distance (in meters)
between your head and the various speakers.
2
Calculate the difference in distance between the
farthest speaker and the other speakers.
L = (distance of farthest speaker)
– (distance of other speakers)
3
Divide the distances calculated for the different
speakers by the speed of sound (343 m/s
temperature 20°C).
This value is the time correction value for the various
speakers.
Concrete examples
Calculating the time correction value for the front left speaker
on the diagram below.
Conditions:
Distance between farthest speaker and listening position:
2.25 m (88-3/4")
Distance between front left speaker and listening position:
0.5 m (20")
Calculation:
L = 2.25 m (88-3/4") – 0.5 m (20")= 1.75 m (68-3/4")
Compensation time = 1.75 ÷ 343 x 1000 = 5.1 (ms)
In other words, setting the time correction value for the front
left speaker to 5.1 (ms) sets a virtual distance matching the
distance to the farthest speaker.
0.5m
2.25m
The sound is uneven
because the distance
between the listening
position and the different
speakers is different.
The difference in the
distance between the front
left and rear right speakers
is 1.75 meters (68-3/4").
5.1ms
Time correction eliminates
the difference between the
time required for the sound
from the different speakers
to reach the listening
position.
Setting the time correction of
the front left speaker to
5.1 ms makes it possible to
coordinate the distance from
the listening position to the
speaker.
47
-EN