Alpine IVA-D900 User Manual
46
-EN
7
4
3
2
1
SOURCE/POWER
Rotary encoder
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").
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.
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.
6
5
Performing Time Correction Manually (TCR)/
Swithing the Phase
Swithing the Phase
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. You can also use this function to switch
the phase.
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. You can also use this function to switch
the phase.
1
Check that Defeat mode is off.
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.
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.
farthest speaker and the other speakers.
L = (distance of farthest speaker)
– (distance of other speakers)
4
Divide the distances calculated for the different
speakers by the speed of sound (343 m/s
temperature 20°C).
speakers by the speed of sound (343 m/s
temperature 20°C).
This value is the time correction value for the various
speakers.
speakers.
Concrete examples
Calculating the time correction value for the front left speaker
on the diagram below.
on the diagram below.
Conditions:
Distance between farthest speaker and listening position:
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.
left speaker to 5.1 (ms) sets a virtual distance matching the
distance to the farthest speaker.
X-OVER Adjustment
1
Check that defeat mode is off.
2
Press SOURCE/POWER.
The main menu is displayed.
3
Press 4 (A.PROC).
A.PROC (Audio processor) list display appears.
4
Turn the Rotary encoder to select “X-OVER.”
5
Press 1 (SETUP L/R) or 2 (SETUP L+R).
X-OVER adjustment display appears.
L/R: Different adjustment values can be set for the left
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.
6
Turn the Rotary encoder to select the speaker to
be set.
be set.
7
Press the function button to adjust the selected
speaker.
speaker.
FREQ. ;DN/UP:: Adjust the H.P.F. or L.P.F. cutoff
frequency.
The adjustable bands differ
according to the channel (speaker).
The adjustable bands differ
according to the channel (speaker).
SLOPE ;DN/UP:: Adjust the H.P.F. or L.P.F. slope.
LEVEL ;DN/UP:: Adjust the level.
LEVEL ;DN/UP:: Adjust the level.
8
Repeat steps 6 and 7 to adjust other channels.
9
Press 7 (RETURN) to return to the previous
display.
display.
• When the speaker is set to the “OFF” mode, X-OVER for that
speaker cannot be set. Refer to “Setting the Speakers” (page 45).
• Check the playback frequencies of the connected speakers before
adjusting.