6
------------------------------------------LC-1.800
13. Crossover
Frequency-
Since
component
speakers (like woofers)
are
designed
to
reproduce certain frequency ranges, a crossover
allows you
to
match the speaker
to
the appropriate frequen-
cy range. Most manufactures list a recommended crossover
frequency
as
part
of
the speaker specifications. Choosing
the
correct crossover
point
will provide increased speaker reliability
and
optimum
sound quality. The
LC-1.800
amplifier comes
with
an
adjustable-frequency 24/dB Octave Linkwitz-Riley crossover.
Adjust the crossover frequency on the
LC-1.800
amplifier
to
match
the value specified by your subwoofer's manufacturer.
If
you
do
not
know this value, start
out
with
the crossover selector turned
all the way
to
the left (counter clockwise) and adjust
it
until you
find a position
that
suits your subwoofer system best.
14. Gain Control
-This
control allows you
to
adjust the overall
volume
output
level in the normal way,
with
counterclockwise
decreasing the volume, and clockwise increasing. Note
that
if
you have fitted the optional
ACR-1
gain control,
it
should first
be set
to
maximum, before setting this gain control. The setting
procedure
is
given on the next page, and involves nerves
of
steel,
a steady hand, grit, determination, and the
thought
that
you are
making the world a better place for deep
bass.
15.
Polarity-
This switch allows you
to
select the polarity
of
the sub-
woofer, either 0 degrees (in-phase) or 180 degrees (out
of
phase).
16. Source Clip
LED-
The LC-1.800 amplifier features
our
MILC™
(Maximum
Input
Level Control) patent-pending level-setting cir-
cuit
that
prevents clipping and damaging distortion. It calculates
when the waveform
of
an
incoming audio signal
is
clipping, and
if
it
is,
this
LED
will fulfill its prime objective and shine forth.
With this advanced feature, you are able
to
optimize
the
level
of
the incoming audio signal until the Source Clip
LED
is
just-prior
to
lighting. If the
LED
comes on during normal operation, you
should adjust
the
level
of
the
audio signals before they reach
the
LC-1.800.
17. Gain Maximized
LED-
This
LED
indicates when the
LC
-1.800
amplifier gain
has
been maximized for
optimum
performance.
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Power
Voltage and Input
Weight and Dimensions
