50
-EN
01GB06IVA-W502E.fm
ALPINE IVA-W502E 68-12118Z56-A (EN)
Calling up the Preset Memory
1
Check whether the Defeat mode is off.
2
Touch any one of the preset buttons
[P.SET 1]
through
[P.SET 6]
on the A.PROCESSOR list
display to select the preset memory.
•
It takes a few moments to call up the preset memory.
Setting the Subwoofer
1
Touch
[SETUP]
on the main source screen.
The SETUP selection screen is displayed.
2
Touch
[AUDIO SETUP]
.
The AUDIO SETUP screen appears.
3
Touch
[
]
or
[
]
of SUBWOOFER to set the
subwoofer ON/OFF.
4
Touch
[
]
of SUBWOOFER after setting the
SUBWOOFER to ON.
The SUBWOOFER SETUP screen appears.
Setting items:
LEVEL / PHASE / SYSTEM / CHANNEL
Touch [
] or [
] of LEVEL to adjust the SUBWOOFER
output.
Setting range: 0 to 15
When the subwoofer is on, you can select either System1 or System2
for the desired subwoofer effect.
Touch
[
]
or
[
]
of SYSTEM to select SYSTEM 1 or
SYSTEM 2
Touch
[
]
or
[
]
of PHASE to select 0° or 180°
The subwoofer output phase is toggled SUBWOOFER NORMAL (0°)
or SUBWOOFER REVERSE (180°).
You can set the subwoofer output to stereo or monaural. Make sure to
set the correct output for your subwoofer type.
Touch
[
]
or
[
]
of CHANNEL to select STEREO or
MONO.
About Time Correction
The distance between the listener and the speakers in a car vary widely
due to the complex speaker placement. This difference in the distances
from the speakers to the listener creates a shift in the sounds image and
frequency characteristics. This is caused by the time delay between the
sound reaching the listener’s right versus the left ear.
To correct this, this unit is able to delay the audio signal to the speakers
closest to the listener. This effectively creates a perception of increased
distance for those speakers. The listener can be placed at an equal
distance between the left and right speakers for optimum staging.
The adjustment will be made for each speaker in 3.4cm steps.
Adjust the time correction level of the front left speaker to a high value
and the rear right to zero or a low value.
The sound is not balanced because the distance between the
listening position and the various speakers is different.
The difference in distance between the front left speaker and the rear
right speaker is 1.75 m (68-7/8").
Here we calculate the time correction value for the front left speaker
in the diagram on the above.
Conditions:
Farthest Speaker – listening position : 2.25 m (88-9/16")
Front left speaker – listening position : 0.5 m (19-11/16")
Calculation: L = 2.25 m – 0.5 m = 1.75 m (68-7/8")
Time correction = 1.75 ÷ 343
*
1
× 1000 = 5.1 (ms)
*
1
Speed of sound: 343 m/s (765 mph) at 20°C
In other words, giving the front left speaker a time correction value of
5.1 ms makes it seem as if its distance from the listener is the same
as the distance to the farthest speaker.
Time correction eliminates the differences in the time required for the
sound to reach the listening position.
The time of the front left speaker is corrected by 5.1 ms so that its
sound reaches the listening position at the same time as the sound of
other speakers.
Adjust the time correction level of each speaker to almost the same level.
1
Sit in the listening position (driver’s seat, etc.) and
measure the distance (in meters) between your head
and the various speakers.
2
Calculate the difference between the distance
correction value to the farthest speaker and the
other speakers.
L = (distance to farthest speaker) – (distance to other
speakers)
Adjusting the Subwoofer Level
Setting the Subwoofer System
SYSTEM 1 :
Subwoofer level changes according to the main
volume setting.
SYSTEM 2 :
Subwoofer level change is different from the main
volume setting. For example, even at low volume
settings, the subwoofer is still audible.
Setting the Subwoofer Phase
Setting the Subwoofer Channel
STEREO:
Subwoofer stereo (L/R) output
MONO:
Subwoofer monaural output
Example 1. Listening Position: Front Left Seat
Example 2. Listening Position: All Seats
5.1ms
2.25m
0.5m
01GB00IVA-W502E.book Page 50 Wednesday, February 20, 2008 4:12 PM
