34
-EN
01GB05VPAB222R.fm
ALPINE VPA-B222R 68-02065Z87-A (EN)
Performing Time Correction Manually
(TCR)
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.
1
Check that Defeat mode is off (page 12).
2
Sit in the listening position (the driver’s seat, for
example) and measure the distance (in meters)
between your head and the various speakers.
3
Calculate the difference in distance between the
farthest speaker and the other speakers.
4
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.
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.
5
Press and hold
TA/RTN/SETUP
for at least 2
seconds.
The SETUP screen is displayed.
6
Press the
joystick
up or down to select
AP SETUP
,
then press the
joystick
right.
The AP SETUP screen is displayed.
7
Press the
joystick
up or down to select
TCR
.
8
Press the
joystick
left or right to select
L/R
or
L+R
.
9
Press the
joystick
up or down to select
TCR SETUP
, then press the
joystick
right.
10
Press the
joystick
up or down to select the desired
speaker.
11
Press the
joystick
left or right to adjust the
calculated time correction value (0.00 to 20.00ms).
(1step=0.05ms)
Time correction value changes continuously by pressing
and holding the joystick.
12
Press
TA/RTN/SETUP
to return to the previous
screen.
•
When the speaker is set to the “OFF” mode, the TCR for that
speaker cannot be set. Refer to “Setting the Speakers” (page 32).
•
The adjustment value for FRONT2 (Speakers) which is adjusted in
time correction, is also applied to the front speakers in “Setting Bass
Focus” (page 36).
•
The adjustment (AUTO TCR) cannot be automatically set on this
unit.
Phase Switching
1
Check that Defeat mode is off (page 12).
2
Press and hold
TA/RTN/SETUP
for at least 2
seconds.
The SETUP screen is displayed.
3
Press the
joystick
up or down to select
AP SETUP
,
then press the
joystick
right.
The AP SETUP screen is displayed.
4
Press the
joystick
up or down to select
PHASE
SETUP
, then press the
joystick
right.
5
Press the
joystick
up or down to select the desired
speaker.
6
Press the
joystick
left or right to switch the phase
(0°or 180°).
7
Press
TA/RTN/SETUP
to return to the previous
screen.
L =
(distance of farthest speaker)
– (distance of other speakers)
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)
2.25m
0.5m
5.1ms
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").
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.
L/R:
Different adjustment values can be set for the left and
right channels.
L+R:
Sets the same adjustment values for the left and right
channels.
01GB00VPAB222R.book Page 34 Monday, January 23, 2006 4:24 AM
