clarion
OMAPA2103
I
1
j
APA2103
2-CHANNEL
CAR
AUDIO
AMPLIFIER
OPERATION
INSTALLATION
MANUAL
clarion
APA2103
~;~?~
.
M,l;
TABLE
OF
CONTENTS
D . .
escr1pt1on ............................................................ 3
Amplifier
Inputs/Controls/Power
lnclicator
........•.•...
4
Connections
for
Speakers/Power
.....•.....•................
5
Applications
.......................................................... 6
Briclgecl-Mono
Subwoofer
System
..........................
6
2-Channel Full-Range/Satellite/Subwoofer System
....
7
Mixecl-Mocle
Satellite/Subwoofer
System
................
8
Installation ............................................................ 9
Mounting
Precautions
............................................
9
w·.
P .
1r1n9 recaut1ons
................................................
9
Setting
Gain ........................................................
12
Using The
HP
/LP Filter .................................... 13
Using The Bass
Extender
................................ 13
Final
System
Checks .......................................... 14
Troubleshooting ..................................................
14
Everyone
Wants
"More Bass" ......................
16
S
·1t
.
pec1
1cat1ons
......................................................
17
2 • Table
Of
Contents
~T'i
:-·>
.
OPERATION/INSTALLATION
MANUAL
DESCRIPTION
The
Clarion
APA2103 2-channel
car
audio
amplifier
(shown
in
Figure
1)
provides
50
watts
of
rms
power
into a 4-ohm
load
and
75
watts
(typical)
into
a
2-ohm
load.
This
full-featured
model
is
an
excellent
choice
for
configuring
a
variety
of
car
audio
sound
systems.
Figure
1.
Clarion
APA2103
2-channel
car
audio
amplifier.
The
APA2103
uses a regulated
MOSFET
power
supply
for
superior
control
of
output
wattage,
regardless
of
input
voltage
or
musical
energy
content.
MOSFETs
are
chosen
for
their
inherent
characteristics
to
provide superior
accuracy,
stability,
and
control. A toroid-coil
transformer
yields
maximum
power
transfer
with
minimum
heat
loss.
Careful
attention
to
circuit
design
keeps
AM
RFI
at
low
levels,
so
you
won't
hear
unwanted
noise
when
the
level
is
cranked
up.
Protection
circuits
safeguard
the
amplifier
when
overheating
and
speaker shorts
or
improper
load
conditions
occur.
All
connections
and
controls
are
on
end
panels
and
are
straightforward
and
easy
to
understand.
We
use
gold-plated
RCA
and
banier
connectors
to
ensure
the
best
electrical
connection
for
your
system. Included
is
an
external
automotive-type
fuse
that
is
easy
to
replace.
·
Description • 3
I
clarion
APA2103
..
~
Amplifier
Inputs/Controls/Power
Indicator
The
APA2103's
front
panel
(see
Figure
2) has
dua
l speaker-level
input
connections,
dual-RCA
input
jack
s, a GAIN
control
for
input
level
adjustment, BASS
EXTENDER
control,
HPF
and
LPF
controls
for
setting
crossover
filter
frequencies, a FILTER selecto
rf
switch, a MODE
switch for
STEREO
or
MONO
operation, and
POWER
indicator.
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BASS
HPF
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12
60
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MONO
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Figure 2 .
Front
panel
layout
of
the Clarion APA2 l 03.
Line-Level/Speaker-Level Inputs
The
APA2103's
gold-plated
RCA
input
jacks,
labeled L (CH
1)
and R (CH
2),
-.
provide
connections
for a line-level
stereo
source.
In
addition, speaker
-le
vel
·.
connections
are
provided
for
installations
where
the
source
unit's
RCA
outputs
are
unavailable
(see
Specifications
on
page
17
for
wire
codes).
Gain Control
·
The
GAIN
control
allows
you
to
set
the
nominal
operating leve
l of
the
amplifier.
The
amplifier's
wide
range,
200
m V
to
5 V
for
RCA
inputs
or
400
m V
to
10 V for
speaker-level
inputs, can
accommodate
input
levels
from
virtually
any
brand
of
source
unit.
Bass
Extender
Control
The
APA2103
also
features a "hig
h-Q" (i.e.,
nai.Tow
frequency
band)
BASS
EXTENDER
circuit
that
is
active
in
all
modes
of
operation.
It
acts
much
like
an
equalizer,
with
adjustable
gain
(from
0to+12
dB)
fixed
at
40 Hz.
Use
this
feature
to
precisely
tune
low-frequency
audio
response
to
compensate
for a less-than-ideal subwoofer
enclosure
design. The
added
boost
produces
rich,
full
bass
tones
that
are
normally
difficult
to
reproduce
in
the
car
audio
environment.
4 • Description
~
-
,
OPERATION/INSTALLATION
MANUAL
High-Pass/Low-Pass Filter Controls
The
APA
2 I
03
has a 12
dB
per
octave
electronic
filter
for
preci
se
frequency
attenuation with
minimal
phase
distortion
and
can
be set
for
high-pass
or
low-pass
operation.
The
steep
crossover
slope
keeps
midran
ge
tones
out
of
the subwoofer
to
eliminate
an
unnatural "nasal" tone
quality
in
the
audio
sys
tem.
It
is
fully
adjustable
between
50
and
200
Hz
(via
the
LPF
or
HPF
control)
and
is
activated
by sliding
the
FILTER
switch
to
either
HPF
or
LPF
(or
OFF
when
filtering
is
not
required).
Use
these
controls,
along
with
your
speaker manufacturer's
recommended
crossover
frequencie
s,
to
quickly
design a more
advanced
system
(see
Applications
starting
on
page
6).
Stereo/Mono
Mode
Switch
The
MODE
switch
provides
selection
of
stereo
or
mono
operation.
Connections
for
Speakers/Power
The
APA2103's
rear
panel
(see
Figure
3)
contains
speaker
and
power
connections
and
an
external
fuse.
Figure
3. Rear panel layout
of
the Clarion APA2 l
03.
Speaker
Connections
The speaker
terminals
are
gold-plated
with
polarity
markings
for
CH 1 (L),
CH 2 (R),
and
MONO
speaker
connections.
Power
Connections
The
power
connections
are
also
gold-plated
and ai·e
labeled
REMOTE
(for
remote
turn-on
via
source
unit), GROUND, and
BATTER
Y (
+12
Vdc).
An
a
utomotive-type
20A
fuse
protects
the
amplifier
circuit.
Description•
5
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