Alpine 3318 - Phase and Stereo;Mono Switches; Output Level Adjustment

6. Adjust the Front and Rear Output Level controls and set the
STEREO/MONO switch (for the subwoofer) as desired
Note these adjustments should be made before installation of
the unit. (Refer to the section “ Output Level” and “STER-
EO/MONO Switch’’.)
* Adjustments using the UP/DOWN touch control switches
are only possible while the indicator corresponding to the
desired mode Is |it.
PHASE Switch
The acoustic characteristics inside a car vary from car to Car.
The acoustic characteristics inside some cars and the type of
speakers used — e.g. subwoofers which are capable of reproduc-
ing very low frequencies — may throw the sound out of phase.
Listen to the sound while switching the PHASE switch back and
forth, and leave it in the position where it gives you most bass
from the subwoofer.
180° 0°
PHASE
STEREO/MONO Switch
If you are only using one subwoofer in the sound system of
your car, this switch should be set to MONO. Set to STEREO
or MONO when two subwoofers are used. Greater sound
separation is obtained by setting the switch to STEREO. On
the other hand, setting th switch to MONO will provide greater
sound volume.
12
SUBWOOFER
MONO STEREO
Output Level
The
output
level
for
both
front
and
rear
amplifier
outputs
have
been
preset
in
the
factory
to
the
best
levels,
and
no
further
adjustment
is
necessary
under
normal
circumstances.
Adjustment,
however,
may
be
required
if
there
are
differences
in
the
output
levels
and
sensitivity
between
the
amplifiers
used
with
the
3318
or
if
there
are
differences
in
speaker
efficiency,
because
the
Fader
contro!
itself
may
not
be
sufficient
to
adequately
make
up
for
excessive
differences
of
the
level
between
the
front
and
rear
speakers.
In
such
a
case,
adjust
the
Output
Level
Controls
as
follows:
1.
Make
fader
adjustment
so
the
Fader
Position
Indicator
is
set
to
the
center
position.
Identical
output
levels
in
the
front
and
rear
speakers
will
thus
be
achieved.
2.
Determine
which
output
level,
from
front
or
rear
speakers,
is
greater.
3.
If
the
output
level
from
the
front
speakers
is
greater,
with
a
flat
blade
screwdriver,
turn
the
Front
Output
Level
control
counterclockwise
until
the
output
levels
of
front
or
rear
speakers
are
in
perfect
balance.
4.
\f
the
output
level
from
the
rear
speakers
is
greater,
turn
the
Rear
Output
Level
control
counterclockwise.