Kenwood KAC-848 User manual
KAC-848
KAC-748
4-CHANNEL
POWER
AMPLIFIER
►
Page
2-11
INSTRUCTION
MANUAL
AMPLIFICATEUR
DE
PUISSANCE
4
CANAUX
►
Page
12-21
MODE
D’EMPLOI
AMPLIFICADOR
DE
POTENCIA
DE
4
CANALES
►
Page
22-31
MANUAL
DE
INSTRUCCIONES
KENWOOD
CORPORATION
Take
the
time
to
read
through
this
instruction
manual.
Familiarity
with
installation
and
operation
procedures
will
help
you
obtain
the
best
performance
from
your
new
power
amplifier.
For
your
records
Record
the
serial
number,
found
on
the
back
of
the
unit,
in
the
spaces
designated
on
the
warranty
card,
and
in
the
space
provided
below.
Refer
to
the
model
and
serial
numbers
whenever
you
calUipon
your
KENWOOD
dealer
for
information
or
service
on
the
product.
Model
KAC-848/748
Serial
number_
-
©
PRINTED
IN
USA
B64-1350-00
(KM)
Safety
precautions
|
AWARDING
To
prevent
injury
or
fire,
take
the
following
precautions:
•
When
extending
the
ignition,
battery,
or
ground
wires,
make
sure
to
use
automotive-
grade
wires
or
other
wires
with
a
5mm
2
(AWG10)
or
more
to
prevent
wire
deterioration
and
damage
to
the
wire
coating.
•
To
prevent
a
short
circuit
never
put
or
leave
any
metallic
objects
(such
as
coins
or
metal
tools)
Inside
the
unit.
•
If
the
unit
starts
to
emit
smoke
or
strange
smells,
turn
off
the
power
immediately
and
consult
your
Kenwood
dealer.
•
Do
not
touch
the
unit
during
use
because
the
surface
of
the
unit
becomes
hot
and
may
cause
burns
if
touched.
acauti6n~
To
prevent
damage
to
the
machine,
take
the
following
precautions:
•
Be
sure
the
unit
is
connected
to
a
12V
DC
power
supply
with
a
negative
ground
connection.
•
Do
not
open
the
top
or
bottom
covers
of
the
unit.
•
Do
not
install
the
unit
in
a
spot
exposed
to
direct
sunlight
or
excessive
heat
or
humidity.
Also
avoid
places
with
too
much
dust
or
the
possibility
of
water
splashing.
•
When
replacing
a
fuse,
only
use
a
new
one
with
the
prescribed
rating.
Using
a
fuse
with
the
wrong
rating
may
cause
your
unit
to
malfunction.
•
To
prevent
a
short
circuit
when
replacing
a
fuse,
first
disconnect
the
wiring
harness.
1
NOTE
•
If
you
experience
problems
during
installation,
consult
your
Kenwood
dealer.
•
If
the
unit
does
not
seem
to
be
working
right,
consult
your
Kenwood
dealer.
Cleaning
the
unit
If
the
front
panel
gets
dirty,
turn
off
the
power
and
wipe
the
panel
with
a
dry
silicon
cloth
or
soft
cloth.
ACAUnONH
Do
not
wipe
the
panel
with
a
hard
cloth
or
a
cloth
dampened
by
volatile
solvents
such
as
paint
thinner
and
alcohol.
They
can
scratch
the
surface
of
the
panel
and/or
cause
the
indicator
letters
to
peel
off.
FCC
WARNING
This
equipment
may
generate
or
use
radio
frequency
energy.
Changes
or
modifications
to
this
equipment
may
cause
harmful
interference
unless
the
modifications
are
expressly
approved
in
the
instruction
manual.
The
user
could
lose
the
authority
to
operate
this
equipment
if
an
unauthorized
change
or
modification
is
made.
Accessories
Part
name
External
View
Number
of
Items
Terminal
cover
(Power
terminal)
<$§£>
1
Self-tapping
screws
(o4
x
16
mm)
@Em>
4
Protection
function
This
unit
is
equipped
with
a
protection
function
for
protecting
this
unit
and
your
speakers
from
various
accidents
or
problems
that
can
occur.
When
the
protection
function
is
triggered,
the
Power
indicator
goes
off
and
the
amplifier
stops
operating.
■
Power
indicator:
When
the
power
is
turned
on,
the
Power
indicator
lights.
If
the
Power
indicator
does
not
light
when
the
power
is
turned
on,
the
protection
function
may
be
activated.
Check
whether
there
is
any
indication
of
trouble.
■
The
protection
function
activates
in
the
following
situations:
•
When
a
speaker
wire
may
be
short-circuited.
•
When
a
speaker
output
contacts
ground.
•
When
the
temperature
of
internal
parts
exceeds
120°C
(248°F).
•
When
a
ground
wire
of
the
center
unit
(cassette
receiver,
CD
receiver,
etc.)
or
this
unit
is
not
connected
to
a
metal
part
serving
as
an
electrical
ground
passing
electricity
to
the
battery's
negative
©
terminal.
2
English
Power
indicator
Installation
procedure
1.
Remove
the
ignition
key
and
disconnect
the
negative
©
terminal
of
the
battery
to
prevent
short
circuits.
2.
Set
the
unit
according
to
the
intended
usage.
3.
Connect
the
input
and
output
cables
of
the
units.
4.
Connect
the
speaker
wires.
5.
Connect
the
power
wire,
power
control
wire
and
grounding
wire
following
this
order.
6.
Install
the
unit
in
the
car.
7.
Connect
the
negative
©
terminal
of
the
battery.
ACAUTION
•
Be
sure
to
turn
the
power
off
before
changing
the
setting
of
any
switch.
•
If
the
fuse
blows,
check
wires
for
shorts,
then
replace
the
fuse
with
one
of
the
same
rating.
•
Check
that
no
unconnected
wires
or
connectors
are
touching
the
car
body.
Do
not
remove
caps
from
unconnected
wires
or
connectors
to
prevent
short
circuits.
•
Connect
the
speaker
wires
to
appropriate
speaker
connectors
separately.
Sharing
the
negative
wire
of
the
speaker
or
grounding
speaker
wires
to
the
metal
body
of
the
car
can
cause
this
unit
to
fail.
•After
installation,
check
that
the
brake
lamps,
winkers,
and
wipers
work
properly.
Installation
Self-tapping
screw
(04
x
16
mm)
Installation
board,
etc.
(thickness
:
15
mm
or
more)
Since
the
power
amplifier
has
no
parts
which
require
operation,
it
can
be
installed
at
a
position
away
from
the
driver's
seat
without
any
hindrances.
As
generally
accepted
positions
for
its
installation,
places
such
as
inside
the
trunk,
etc.
can
be
considered.
Use
the
extension
cables.
(Optional.)_
---
0.5m
1m
2m
4m
5m
6m
RCA
cable
CA-2SL
CA-12SL
CA-22SL
CA-52SL
RCA
cable
(07mm)
CA-3WL
CA-13WL
CA-23WL
—
CA-53WL
RCA
cable
(0l2mm)
CA-5W
CA-15W
CA-25W
CA~45W
CA-65W
ACAUTION
•
Do
not
install
the
unit
under
the
carpet.
Otherwise
heat
build-up
occurs
and
the
unit
may
be
damaged.
•
Install
this
unit
in
a
location
which
allows
heat
to
easily
dissipate.
Once
installed,
do
not
place
any
object
on
top
of
the
unit.
•
The
surface
temperature
of
the
amplifier
will
become
hot
during
use.
Install
the
amplifier
in
a
place
where
people,
resins,
and
other
substances
that
are
sensitive
to
heat
will
not
come
into
contact
with
it.
•
When
making
a
hole
under
a
seat,
inside
the
trunk,
or
somewhere
else
in
the
vehicle,
check
that
there
is
nothing
hazardous
on
the
opposite
side
such
as
a
gasoline
tank,
brake
pipe,
or
wiring
harness,
and
be
careful
not
to
cause
scratches
or
other
damage.
•
Do
not
install
near
the
dashboard,
rear
tray,
or
air
bag
safety
parts.
•
The
installation
to
the
vehicle
should
securely
fasten
the
unit
to
a
place
in
which
it
will
not
,
obstruct
driving.
If
the
unit
comes
off
due
to
a
shock
and
hits
a
person
or
safety
part,
it
may
cause
injury
or
an
accident.
•
After
installing
the
unit,
check
to
make
sure
that
electrical
equipment
such
as
the
brake
lamps,
turn
signal
lamps
and
windshield
wipers
operate
normally.
...
English
3
Controls
This
is
a
4
channel
amplifier
including
2
stereo
amplifiers
in
a
body.
One
amplifier
is
referred
to
as
amplifier
A
and
the
other
is
amplifier
B.
This
unit
is
compatible
with
a
large
variety
of
systems
by
combining
the
switches
and
functions
described
in
the
following.
®
®
®
(D
Fuse
(20
Ax
2
:
KAC-848)
(30
Ax
1
:
KAC-748)
@
Battery
terminal
©
Ground
terminal
©
Power
control
(REMOTE)
terminal
©
Amplifier
A
speaker
output
terminals
®
Amplifier
B
speaker
output
terminals
4
English
❖
SPEAKER
OUTPUT
terminals
•
Stereo
Connections:
When
you
wish
to
use
the
unit
as
a
stereo
amplifier,
stereo
connections
are
used.
The
speakers
to
be
connected
should
have
an
impedance
of
2Q
or
greater.
When
multiple
speakers
are
to
be
connected,
ensure
that
the
combined
impedance
is
2
Q
or
greater
for
each
channel.
•
Bridged
Connections:
When
you
wish
to
use
the
unit
as
a
high-
output
monaural
amplifier,
bridged
connections
are
used.
(Make
connections
to
the
LEFT
channel
(+)
and
the
RIGHT
channel
(-)
SPEAKER
OUTPUT
terminals.)
The
speakers
to
be
connected
should
have
an
impedance
of
4£1
or
greater.
When
multiple
speakers
are
to
be
connected,
ensure
that
the
combined
impedance
is
4Q
or
greater.
ACAUTION
The
rated
input
of
the
speakers
should
be
no
less
than
the
maximum
output
of
the
amplifier.
Otherwise
malfunction
may
result.
®
Speaker
level
input
terminals
(KAC-748
only)
®
FREQUENCY
control
When
the
FILTER
switch
is
set
to
the
HPF
(High-Pass
Filter)
or
LPF
(Low-Pass
Filter)
position,
the
threshold
frequency
can
be
adjusted
with
this
control.
®
FILTER
switch
High-pass
or
low-pass
filtering
can
be
applied
to
the
speaker
output
according
to
the
setting
of
this
switch.
®
OPERATION
switch
The
amplification
methods
of
the
signals
input
to
amplifiers
A
and
B
can
be
selected
independently
according
to
the
setting
of
this
switch.
•
STEREO
position:
The
amplifier
can
be
used
as
a
stereo
amplifier.
•
L+R
position:
The
input
left
and
right
signals
are
combined
before
being
amplified.
Use
this
position
when
the
unit
is
used
for
subwoofer
speakers
or
the
L+R
(monaural)
sound
is
required.
•
MONO
(Lch)
position:
Amplifies
the
signal
input
from
the
left
side
only.
Set
to
this
position
and
make
bridged
,
connections
to
use
as
a
high-power
monaural
amplifier.
(The
input
right
signal
is
not
output.)
©
INPUT
SENSITIVITY
control
Set
this
control
according
to
the
pre-output
level
of
the
center
unit
connected
with
this
unit,
or
to
the
maximum
power
output
of
the
genuine-accessory
car
stereo.
Use
the
diagram
on
the
right
as
a
guide.
KAC-748
only.
NOTE
|
For
the
pre-output
level
or
the
maximum
power
output,
refer
to
the
"Specifications”
in
the
instruction
manual
of
the
center
unit.
©
RCA
cable
ground
lead
terminal
®
INPUT
SELECTOR
switch
This
switch
selects
the
input
method
of
the
signals
to
be
amplified
by
amplifiers
A
and
GDCB
K)
.
.
INPUT
SELECTOR
•
A
B
position:
Amplifies
both
of
the
signals
input
to
amplifiers
A
and
B.
•
A
position:
Amplifies
only
signal
input
amplifier
A
with
both
amplifiers
A
and
B.
@
Amplifier
A
UNE
IN
terminal
©
Amplifier
B
UNE
IN
terminal
®
LINE
OUT
terminal
These
jacks
output
respectively
the
signals
input
to
amplifiers
A
and
B.
They
always
output
the
stereo
signals
regardless
of
the
position
of
the
OPERATION
switch.
/
English
5
Connection
■
RCA
cable
connection
Do
not
connect
cables
and
leads
to
both
RCA
cable
input
jacks
and
the
speaker
input
terminals
simultaneously,
for
this
may
cause
malfunction
or
damage.
RCA
cable
ground
terminal
0
Left
input
®
Left
input
RCA
cable
ground
terminal
When
using
an
RCA
cable
with
a
ground
lead
attached,
connect
the
ground
lead
to
this
terminal.
ACAUTION
Do
not
use
this
terminal
for
power
source
grounding.
This
unit
will
be
damaged
if
the
power
source
grounding
wire
is
connected
to
this
terminal.
■
Speaker
level
input
connection
(KAC-748
only)
Connect
the
unit
by
inserting
it
in
the
connection
between
the
genuine-accessory
car
stereo
and
speakers.
6
English
•
The
genuine-accessory
car
stereo
shall
have
a
maximum
power
output
of
no
more
than
25
W.
•
Do
not
connect
the
speaker
output
leads
from
a
power
amplifier
(Optional)
to
the
speaker
input
terminals
of
this
unit,
for
this
may
cause
malfunction
or
damage.
•
Do
not
connect
cables
and
leads
to
both
RCA
cable
input
jacks
and
the
speaker
input
terminals
simultaneously,
for
this
may
cause
malfunction
or
damage.
•
Connect
the
power
control
lead
to
a
power
supply
which
can
be
turned
ON/OFF
by
the
ignition
key
switch
(ACC
line).
With
this
connection,
shock
noise
may
be
generated
when
the
power
of
the
genuine-accessory
car
stereo
is
switched
ON/OFF.
■
Speakers
wire
connection
(Stereo
Connections)
(Bridged
Connections)
English
7
Connection
—
I
Speaker
Selection
The
rated
input
power
of
the
speakers
that
are
going
to
be
connected
should
be
greater
than
the
maximum
output
power
(in
Watts)
of
the
amplifier.
Use
of
speakers
having
input
power
ratings
that
are
less
than
the
output
power
of
the
amplifier
will
cause
smoke
to
be
emitted
as
The
impedance
of
the
speakers
that
are
going
to
be
connected
should
be
2Q
or
greater
(for
stereo
connections),
or
4Q
or
greater
(for
bridged
connections).
When
more
than
one
set
of
speakers
are
going
to
be
used,
calculate
the
combined
impedance
of
the
speakers
and
then
connect
suitable
speakers
to
the
amplifier.
Examples:
KAC-848
KAC-748
Stereo
Connections
(4£l)
1
0
0
W
or
greater
__
70
W
or
greater
Bridged
Connections
(4£l)
300
W
or
greater__
200
W
or
greater
O
T
200W
.
<
4
?)
et
200W
(40)
200W"*
(40)
©
:
—f
200W:
+JrUj(2£2)
j
4-,Lrfl200W
i
i
T?U
(2n)
*
i
4
£2.*•
200W®
*
(40)
n:
100W
(80)
100W
(80)
Maximum
output
of
the
amplifier
Combined
impedance
Rated
input
power
and
impedance
of
the
speakers
■
Power
wire
connection
AWARNING~|
To
prevent
fire
caused
by
a
short
in
the
wiring,
connect
a
fusible
link
or
breaker
nearby
the
battery’s
positive
terminal.
buzzing
noise
is
heard
from
the
speakers
when
the
engine
is
running,
connect
a
line
noise
filter
(optional)
to
each
of
the
battery
wire.
^
*
•
Do
not
allow
the
cord
to
directly
contact
the
edge
of
the
iron
plate
by
using
Grommets.
•
Connect
the
ground
wire
to
a
metal
part
of
the
car
chassis
that
acts
as
an
electrical
ground
passing
electricity
to
the
battery’s
negative
©
terminal.
Do
not
turn
the
power
on
if
the
ground
wire
is
not
connected
•
•
Be
sure
to
attach
a
protective
fuse
into
the
battery
wire
close
to
the
battery.
Use
a
protective
fuse
having
a
capacity
that
is
about
10
A
higher
than
the
maximum
current
drawn
by
the
amplifier.
•
Use
vehicle-type
(fire-resistant)
power
supply
wiring
wire
for
the
battery
wire
and
the
ground
wire.
The
current
capacity
of
the
power
supply
wiring
wire
should
be
about
10
A
higher
than
that
of
the
protective
fuse
capacity
(which
means
about
20
A
higher
than
the
maximum
current
drawn
by
the
•
When
more
than
one
power
amplifier
are
going
to
be
used,
use
a
power
supply
wiring
wire
and
protective
fuse
of
greater
current-handling
capacity
than
the
total
maximum
current
drawn
by
each
amplifier.
Example:
One
Power
Amplifier
Is
Used
Model
Maximum
Current
Drawn
KAC-848
38
KAC-748
I
28
A
ross-sectionai
Area
o
Wire
(AWG)
5
mm
2
(AWG
10)
or
greater
x
1
5
mm
2
(AWG
10)
or
greater
x
‘
Power
terminal
,
Connect
to
their
respective
terminals
the
power
control
wire,
power
supply
wire,
and
ground
wire,
all
of
which
pass
through
the
associated
terminal
cover.
Once
the
connections
are
complete,
place
the
cover
on
the
terminal
section.
System
examples
__
I
Full-range
4-channel
+
Subwoofer
system
CENTER
UNIT
LJ
rl
Switch
setting
5®
“t
StBo'g
l»l
l
M»f
_A
■
■
line!
®o
QCHJT;
5
i
Amplifier
Front
speaker
Rear
speaker
[Subwoofer
English
9
(High
pass)**
Subwoofer
(L
+
R)
(Bridged)
•Principle
of
Tri-mode
_
Method
of
frequency
band
division
using
a
coil
and
capatftor***in
case
of
6dB/oct.
slope
Coil
(L):
Passes
low
frequencies
and
blocks
high
frequencies.
(Low
pass)
Capacitor
(Cl:
Passes
high
frequencies
and
blocks
low
frequencies.
(High
pass)
159000
fc
x
R
159
x
R
fc
fc=Cut
of
Frequency
(Hz)
R=Speaker
Impedance
(Q)
•
Example:
When
it
is
required
to
set
a
crossover
frequency
of
120
Hz
using
speakers
with
an
impedance
of
4
ohms
.
Prepare
commercially-available
coil
and
capacitor
with
the
closest
ratings
to
the
results
calculated
from
the
formula
above.
The
capacitor
rating
should
be
as
close
as
possible
to
331.25
(pF)
and
the
coil
rating
should
be
as
close
as
possible
to
5.3
(mH).
•
If
you
wish
to
bridge-connect
a
speaker,
the
speaker
impedance
must
be
no
less
than
4
ohms.
•
Connecting
a
speaker
with
an
impedance
lower
than
4
ohms
may
damage
the
unit.
•
Be
sure
to
connect
capacitors
to
speakers
to
which
high
frequencies
will
be
passed.
Failure
to
do
so
will
result
in
a
drop
of
the
combined
impedance
with
the
subwoofer.
•
Ensure
that
the
withstand
voltage
and
current
ratings
of
the
capacitors
<C)
and
coils
(L)
are
sufficient.
10
English
Troubleshooting
Guide
What
might
appear
to
be
a
malfunction
in
your
unit
may
just
be
the
result
of
slight
misoperation
or
miswiring.
Before
calling
service,
first
check
the
following
table
for
possible
problems.
PROBLEM
POSSIBLE
CAUSE
SOLUTION
No
sound.
(No
sound
from
one
side.)
•
Input
(or
output)
wires
are
disconnected.
•
Protection
circuit
may
be
activated.
•
The
fuse
may
be
blown
because
the
volume
was
too
high.
•
Connect
the
input
(or
output)
wires.
•
Check
connections
by
referring
to
"Protection
function".
•
Replace
the
fuse
with
a
new
fuse
and
use
a
lower
volume.
The
output
level
is
too
small
(or
too
large).
The
input
sensitivity
adjusting
control
is
not
set
to
the
correct
position.
Adjust
the
control
correctly
referring
to
“Controls".
The
sound
quality
is
bad.
(The
sound
is
distorted.)
•
The
speakers
wire
are
connected
with
wrong
®
/
©
polarity.
•
A
speaker
wire
is
pinched
by
a
screw
in
the
car
body.
•
The
switches
may
be
set
improperly.
•
Connect
them
properly
checking
the
©
/
©
of
the
terminals
and
wires
well.
•
Connect
the
speaker
wire
again
so
that
it
is
not
pinched
by
anything.
•
Set
switches
properly
by
referring
to
"System
examples".
Specifications
Specifications
subject
to
change
without
notice.
Audio
Section.
.KAC-848
Max
Power
Output
(4
ft)
4
Channel
Mode.TOO
W
x
4
3
Channel
Mode.TOO
W
x
2
+
300
W
x
1
2
Channel
Mode.300
W
x
2
Rated
Power
Output
(4
ft)
4
Channel
Mode
(20
Hz
~
20
kHz,
less
than
0.08
%
THD).50
W
x
4
3
Channel
Mode
(1
kHz,
0.08
%
THD)
+
(1
kHz,
0.8
%
THD)
.
.
5
0Wx2
+
150Wx1
2
Channel
Mode
(1
kHz,
0.8
%
THD).150
W
x
2
Rated
Power
Output
(2
ft)
4
Channel
Mode
(1
kHz,
0.8
%
THD).75
W
x
4
Frequency
Response
(+0,
-1
dB).5
Hz
~
50
kHz
Signal
to
Noise
Ratio..TOO
dB
Sensitivity
(MAX)
(rated
output).0.15
V
(MIN)
(rated
output).4.0
V
Input
Impedance.TO
kft
Low
Pass
Filter
Frequency
(12
dB/oct.)
(Variable).50
-
200
Hz
High
Pass
Filter
Frequency
(12
dB/oct.)
(Variable).50
~
200
Hz
KAC-748
70
W
x
4
70
W
x
2
+
200
W
x
1
200
W
x
2
35
W
x
4
35Wx2
+
lOOWxl
1
0
0
W
x
2
50
W
x
4
5
Hz
~
50
kHz
100
dB
0.T5V
4.0
V
10
kft
50
~
200
Hz
50
~
200
Hz
General.KAC-848
Operating
Voltage
(11
~
16
V
allowable).14.4
V
Current
Consumption
(1
kHz,
10
%
THD).38
A
Dimensions
(W
x
H
x
D).290
x
56
x
280
mm
(11-7/16x2-3/16x11
in.)
Weight.4.3
kg
(9.4
lb)
KAC-748
14.4
V
x
28
A
290
x
56
x
230
mm
(11
-7/16x2-3/16x9*1/16
in.)
3.7
kg
(8.1
lb)
English
11
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