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11. Re-center
the fader control, verify that all
speakers are functional, close all the vehicle doors
and windows, and repeat steps 5 through 8.
12. The Subwoofer output, CH 1/2 High or CH 3/4
High output (or any other output) level can now be
increased or decreased for customer preferences
such as more low bass or more emphasized highs.
13. Using a high quality music source, carefully
evaluate the sound and perform any additional ad-
justments as necessary.
14. To overcome noises increasing in proportion
to cruising speed, set the subwoofer level as fol-
lows.
Make a test-drive, carefully listen, and set the
3681's Subwoofer level control to a compromised
value between the optimum setting for stationary
and freeway speed conditions.
ADJUSTMENT WITHOUT AN RTA:
1. The unit should be temporarily moved to the
driver's seat vicinity using long extension cables,
and the adjustment should be done with the install-
er in the driver's seat.
2. A high quality source material (music) with ex-
cellent sound quality and frequency response must
be used.
3. Turn the sound system on, verify that all compo-
nents are functional, and place all controls such as
Bass, Treble, Fader, Balance, in-dash equalizer con-
trols (if any) are in the center (neutral) position. Al-
so verify that the Subwoofer Fading Mode Switch,
Subwoofer Stereo/Mono Switch, and CH 1/2 and
CH 3/4 Crossover Mode are set as needed.
Perform the following steps while seated in the
driver's seat, with all doors, windows and trunk
closed, and the vehicle interior completely in-
tact.
4. If you are using a head unit with separate front
and rear pre-outs, verify that the 2-Input mode is se-
lected, and fade to the front.
Make sure that the
rear drivers are defeated.
5. Listen carefully and try to find output level imbal-
ance between the different component speakers.
6. If such an imbalance
exists, determine which
output level is the lowest.
7. Try to keep the output level for that band (or
bands) at 0 dB if possible.
8. Cut the other bands, as necessary, to balance
the sound.
9. Adjust and fine-tune the crossover points for
each region for the most smooth
and pleasant
sound.
10. If your head unit has a single pre-amp output
only, skip to item 13.
11. Fade
to the
rear,
check
for defeated
front
speakers, close all vehicle doors and windows, and
repeat steps 5 through 9.
' 12. Re-center
the fader control, verify that all
speakers are functional, close all the vehicle doors
and windows, and repeat steps 5 through 9.
13. The Subwoofer output, CH 1/2 High or CH 3/4
High output (or any other output) level can now be
increased
or decreased for listener preferences
such as more low bass or more emphasized highs.
14. Using a high quality music source, carefully
evaluate the sound and perform any additional ad-
justments as necessary.
15. To overcome noises increasing in proportion
to cruising speed, set the subwoofer level as fol-
lows.
Make
a test-drive, carefully listen, and set the
3681's Subwoofer level control to a compromised
value between the optimum setting for stationary
and freeway speed conditions.
On the Control Unit 4381
When performing adjustment of 3681 in the Alpine
dealers, a dedicated control unit of 4381 will be used.
In this case, connect the 4381 to the Remote Control
Unit Connector @.
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