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GENERAL REQUIREMENTS:
The Alpine 3681 is a very precise and versatile piece
of equipment.
It should be adjusted by an-auto-
sound specialist who possesses the knowledge
and the tools to accomplish this task accurately. It
would be helpful to use a Real Time Analyzer (such
as Alpine 4780), but it is not absolutely necessary.
* It is imperative to have easy access to the 3681
while it is being adjusted.
If it is to be mounted
permanently in a location which will not allow easy
access, it will be necessary to temporarily relocate
the unit by using long audio and power extension
wires.
* Before any adjustments can be made, all stereo
system components
(except for the 3681) must be
permanently mounted in their locations, and the
passenger compartment should be completely re-
assembled, as removed door panels or seats will
affect the frequency response of the vehicle's inte-
rior.
* The vehicle's doors should be closed and win-
dows rolled up. This may require temporary relo-
cation of the 3681 outside the vehicle's passenger
compartment (if it is to be permanently mounted
there) using long extension wires.
* The trunk can be left open if the passenger com-
partment, including all the speakers and speaker
enclosures, are sealed off from the trunk.
* Check the component speakers' specifications
for their rated frequency response.
The active
crossover frequencies used for each speaker must
fall within its frequency response.
For example, a
mid-bass woofer rated from 60Hz to 300 Hz must
not be driven with frequencies lower than 60 Hz or
higher than 300 Hz. Otherwise, the sound quality
will be severely degraded and speaker damage
may also result. Therefore, tentatively adjust the
3681 crossover points not to exceed the frequency
response of the drivers and remember to stay with-
in these boundaries during the adjustment proce-
dure.
RTA (Real Time Analyzer) REQUIREMENTS AND
SET-UP:
* It will be most convenient to have the 3681 as
close as possible to the RTA during adjustments as
it is easier to monitor the changes made by each
control.
* This RTA should cover at least 20 Hz to 20 kHz in
at least one-octave increments.
It should also pos-
sess the ability to analyze and display frequency re-
sponse at 100 dB or more Sound Pressure Level
(SPL).
,
* Asthere are many different makes and models of
Real Time Analyzers, it would be impractical to de-
fine set-up procedures for a specific unit. There-
fore, you will need to familiarize yourself with the
particular model of RTA you will be using to adjust
the 3681.
The RTA''s owner's manual can provide
all the necessary information. Alpine's 4780 Third
Octave Analyzer can provide excellent accuracy,
versatility and ease of operation.
* A high quality, calibrated microphone should be
used with the RTA. The RTA manufacturer can re-
commend
a suitable
model.
This microphone
should have a very flat response throughout the au-
dio bandwidth (20 Hz to 20 kHz). The Alpine 4780
RTA includes a calibrated microphone.
NOTE: RTA adjustments must be done in quiet
surroundings.
Noise from wind, traffic, or other
car stereo systems will affect the RTA readings
and throw off the adjustments.
After all the general requirements are met, proceed
as follows:
1.. Position the microphone on a microphone stand
placed on the driver's seat, in the same position and
height as the right ear of the driver.
2. Connect the microphone to the RTA.
Set the
controls for non-weighting and greater than 100 dB
range.
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