Tuning The Amplifier -Front
and
Rear
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6)
Input Sensitivity
Control
Starting with the front channels, slowly rotate the control clockwise (refer
to
the diagram on page
5)
until maxi-
mum
undistorted playing level is heard from the speakers. Listen closely
for
bottoming from the speakers. If detect-
ed, rotate the input sensitivity control counterclockwise until it is eliminated. Repeat for the rear channels.
7)
Crossover
Controls
To
achieve higher undistorted playing levels
from
the both the front and rear speakers, the highpass crossover
must
be
engaged. Starting with the front channels, rotate the crossover control fully clockwise (refer
to
the
diagram
on
page
5).
The highpass crossover point is
now
set at
350Hz.
Rotate "a-Tune'·" Control fully counterclockwise (front
channels only). Move crossover switch to the right (ON) position.
Slowly rotate the input sensitivity control clockwise until maximum undistorted playing level is heard from the
speakers. Listen closely for bottoming from the speakers. Ifdetected, rotate the input sensitivity control counterclock-
wise until
it
is eliminated. Slowly rotate the highpass crossover control counterclockwise while listening
for
bottoming.
You
are lowering the crossover point, which means that more bass signal is being sent
to
the speakers. If
bottoming is detected, rotate the input sensitivity control counterclockwise until
it
is
eliminated and/or rotate the
Highpass crossover control clockwise
to
raise the crossover point. Repeat for the rear channels.
8)
Q-Tune™
Control
(Front
Channels
Only)
Once the highpass crossover point has been determined, use the a-Tune'· control (refer
to
the
diagram
on page
5)
to
increase the bass information centered around the crossover point.
Setting the a-Tune'· control
is
done in conjunction with setting the levels on the input sensitivity and highpass
crossover frequency controls.
You
may find while setting the a-Tune'· that over-excursion may
be
detected in the
front speakers; lowering the a-Tune'· input sensitivity
or
raising the highpass crossover point will eliminate this.
Minor
adjustments to each setting are required to fine-tune the system.
Setting the a-Tune'· is asubtle process. It is recommended that the a-Tune'· setting
be
left in the
0.7
position and
adjusted only after the input sensitivity and highpass crossover ranges are known. Small adjustments
to
the a-Tune'·
setting are all that are required to fine-tune the system.
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4-Channel Operation Wiring Configuration Diagram 9
