X-Over Adjustment; Performing Time Correction Manually (Tcr); Swithing The Phase - Alpine IVA-D901 Owner's Manual

4
3
2
1
Rotary encoder
SOURCE/POWER

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
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.
7
Press the function button to adjust the selected
speaker.
FREQ. ;DN/UP:: Adjust the H.P.F. or L.P.F. cutoff
frequency.
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.
8
Repeat steps 6 and 7 to adjust other channels.
9
Press 7 (RETURN) to return to the previous
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.
• In order to protect the speakers, there is no OFF setting for the
subwoofer low pass filter (the slope remains the same).
• Even if Tweeter is selected for FRONT 1, the filter OFF (slope
OFF) of the H.P.F. can be set. If the slope is set to OFF, speakers
may be damaged. Take care with this setting.
46
-EN

Performing Time Correction Manually (TCR)/

Swithing the Phase

Because of the particular conditions inside the vehicle, there can be
5 major differences in the distances between the various speakers and
the listening position. It is possible to calculate the optimum
6
correction values and eliminate the time error at the listening position
yourself using this function. You can also use this function to switch
7
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.
3
Calculate the difference in distance between the
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).
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
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
2.25m
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.