Alpine Multimedia Manager PXA-H900 Owner's Manual page 19

4
Secure the microphone in place.
Failure to fix the microphone securely in place
may result in distortion or improper acoustic
positioning. The microphone must be mounted
very securely so the bass frequencies will not
vibrate it. For example, the microphone could be
wedged between the headrest and the seat. If the
microphone is placed on a tripod, the microphone
must be very securely mounted to the tripod (not
loosely clamped). The tripod must also be very
securely weighted and/or strapped so it cannot
move. The microphone would usually be placed
near the driver's ear position. However, since the
Adaptive Equalizer is adjusting low frequencies,
the microphone does not need to be at the exact
ear position, it is more important that it is securely
mounted.
Hints for making the Adaptive Equalizer
To achieve the desired acoustic image, we recommend fastening
the microphone to the four points described below. (The figures
are approximates. Adjust them according to the vehicle.)
A Ceiling directly above the listening position (driver's seat
position – sharp sound)
B 20 cm (7-7/8") in front of above position (driver's seat
position – softer sound than above, bass sound posi-
tioned toward front)
C 20 cm (7-7/8") further in front of above position (driver's
seat position – even softer sound, bass sound positioned
further toward front)
D Base of rearview mirror (position for both driver's and
passenger's seats)
D
C 40cm(15-3/4")
B 20cm(7-7/8")
A 0
adjustments
• The acoustic positioning changes
according to the position of the
microphone because the human
ear senses the distance from the
sound's focal position. Adjust
according to your personal
tastes.
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