Performing Time Correction Manually (Tcr)/ Phase Switching; Calculating The Time Correction; Inputting The Time Correction - Alpine DVA-9861Ri Owner's Manual

6
Adjust the cut-off frequency of H.P.F. (HP FREQ) by
turning the Rotary encoder, then press MODE.
The adjustable frequency range differs depending on the
channels (speakers).
7
Adjust the slope of H.P.F. (HP SLOPE) by turning the
Rotary encoder, then press MODE.
8
Adjust L.P.F. by performing steps 6 and 7.
9
Adjust the level (LEVEL) by turning the Rotary
encoder, then press MODE.
Press the MODE to return to step 6.
10
To adjust other channels, repeat steps 5 to 9.
11
When the setting is complete, press and hold TA for
at least 2 seconds.
The unit returns to the normal mode.
• When the speaker is set to the "OFF" mode, the X-OVER for that
speaker cannot be set. Refer to "Setting the Speakers" (page 37).
• 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, if subwoofer is set to STEREO, CENTER
adjustment is affected by the subwoofer setting.
• When the setting is complete, it is recommended to store the setting
contents. For storing, refer to page 44.
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.
38
-EN
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").

Inputting the Time Correction

4
Check that Defeat mode is off (page 25).
5
Press and hold TA for at least 2 seconds.
The audio processor control mode is activated.
6
Select the TCR/PHASE mode by pressing TA
repeatedly.
7
Select L+R or L/R by pressing and holding BAND for
at least 2 seconds.
L+R: Sets the same adjustment values for the left and right
channels.
L/R: Different adjustment values can be set for the left and
right channels.
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.