Kenwood KAC-728S User manual

KENWOOD
KAC-728S
KAC-628
KAC-608S
KAC-428S
INSTRUCTION MANUAL
MODE D’EMPLO!__
AMPLIFICADOR DE POTENCIA ® Page 22-31
MANUAL DE INSTRUCCIONES
KENWOOD CORPORATION
Take the time to read through this instruction manual.
Familiarity with installation and operation procedures willhelp __.
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 call upon your
KENWOOD dealer for information or service on the product.
Model KAC-728S/628/608S/428S Serial number .
© PRINTED IN USA B64-1359-00 (KM) gee

—
Safety
precautions
_
ie
-*.
2
SPREE
gg
|
Oo
ag
To
prevent
injury
or
fire,
take
the
following
precautions:
e
When
extending
the
ignition,
battery,
or
ground
wires,
make
sure
to
use
automotive-
grade
wires
or
other
wires
with
a
5mm’
(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.
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.
2 English
External
If
you
experience
problems
during
installation,
consult
your
Kenwood
dealer.
-
e
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
pane!
with
a
dry
silicon
cloth
or
|
soft
cloth.
ACAUTION |.
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
Number of
items
Terminal cover &S)
(Power terminal)
Self-tapping screws
(a4 x 16 mm)

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
amplifi
er
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:
e
When
a
speaker
wire
may
be
short-circuited.
e When a speaker output contacts ground.
e
When
the
unit
malfunctions
and
a
DC
signal
is
sent
to
the
speaker
output.
#
When
the
temperature
of
internal
parts
exceeds
120°C
(248°F).
e
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.
Power indicator
Installation
procedure
‘
7
1.Remove
the
ignition
key
and
disconnect
the
negative
©
terminal
of
the
patieny
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.
¢
Be
sure
to
turn
the
power
off
before
changing
the
setting
of
any
switch.
elf
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.

‘Controls
Operations
of
the
following
control
and
switches
are
required
in
accordance
with
the
center
unit
and
speakers
connected
with
this
unit.
KAC-728S
KAC-608S
KAC-628
KAC-428S
KAC-728S
KAC-628
KAC-608S
KAC-428S
4 English

@
RCA
cable
ground
lead
terminal
@ FILTER switch
These switches allow filtering of the
speaker output signals.
KAC-7288/6088/428S KAC-628
FILTER OFF
OFF LPF HPE,
-
HPF
(High
Pass
Filter)
position
(KAC-628
only)
Only
frequencies
of
150
Hz
or
higher
are
output.
(Frequencies
below
150
Hz
are
cut.)
»
LPF
(Low
Pass
Filter)
position
Only
frequencies
of
80
Hz
or
lower
are
output.
(Frequencies
above
80
Hz
are
cut.)
The
Lch
and
Rch
will
be
mixed
before
output
even
if
the
operation
switch
is
set
to
STEREO.
¢ OFF position
The
original
sound
without
filtering
is
output.
@ OPERATION switch
This switch allows selection of the
amplification method of input signals.
KAC-728S/608S/428S
KAC-628
OPERATION
OPERATION
STEREO
MONO(Lch)
L+R
— STEREQ | MONO{Lch)
= me eo
¢ STEREO position
The amplifier can be used as a stereo
amplifier.
- L+R position (KAC-628 only)
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 4
right
as
4
guide.
WY
05
0.3
*{@)
For
the
pre-output
level!
or
A
AX
the
maximum
power
output,
25
Ww)
refer to the “Specifications”
in the instruction manual of the center unit.
© LINE IN terminal
©
Speaker
level
input
terminals
@ Fuse (20 Ax 2: KAC-728S)
(25 Ax 1: KAC-628/608S})
(15 Ax 1: KAC-428S) :
Battery terminal
@ Ground terminal
Power
control
(REMOTE)
terminal
@)
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
2Q
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 4Q or greater. When
multiple speakers are to be connected,
ensure
that
the
combined
impedance
4s
4Q
or greater. :
The rated input of the speakers should be
no less than the maximum output of the
amplifier. Otherwise malfunction may
result.
English &

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
Left
input
Right
input
ig a : =a
To Power control | :
eEMOTe terminal fee cable. ;
: ommercially
CENTER UNIT | ft eupor ite J available part)
p=
(Cassette receiver,
Right output (Red)
CD receiver, etc.)
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
Connect the unit by inserting it in the connection between the genuine-accessory car stereo
and SRE
SaeneTON not connect cables and leads to-both RCA cable input jacks and the speaker input terminals
simultaneously, for this may cause malfunction or damage.
Left input Right input
Lead
terminal
To
Power
control
(Commercially available parts) (REMOTE) terminal
;
=>
Genuine-accessory
car stereo
Battery
* The genuine-accessory car stereo shall have a maximum power output of no more than 25 Ww.
* Do not connect the speaker output leads from a power amplifier (Optional) to the Sail input
terminals of this unit, 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.
6 English

a Speakers wire connection
(Stereo Connections)
Left output Right output
il)
ao
eoces
Lead
terminal
(Commercially
available
parts)
© 1 Right
r=) speaker
© | Left
r+) speaker
(Bridged Connections)
Loh
=
8 6 Lead terminal *
(Commercially available parts)
e
°
@ 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
well
as
damage.
*
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:
Bridged Connections (4Q)
Stereo Connections (4Q)
KAC-728S
200
W
or
greater
600
W
or
greater
KAC-628/608S
100
W
or
greater
300
W
or
greater
200 W or greater
70 W or greater
KAC-428S
: 4 Owe...
Maximum
output
of
Combined
the
amplifier
impedance
Rated
input
power
and
impedance
of
the
speakers

Connection
@ Power wire connection
To
prevent
fire
caused
by
a
short
in
the
wiring,
connect
a
fusible
link
or
breaker
nearby
the
battery's
positive
terminal.
ae eeee* Lead terminal
(Commercially available parts)
(ea Terminal cover | CENTER UNIT |
.* Car fuse box
a
<S
v a
wes?
Power control wire
(Commercially available parts) ACC
Battery wire Ground wire
{Commercially available parts} (Commercially available parts)
Lead terminal
.»e(Commercially available parts)
Protective
Fuse
Power terminal 7 ‘
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.
Wiring
¢
If
a
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.
e
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
amplifier).
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.
;
8 English

Example:
One
Power
Amplifier
ls
Used
ross-sectional Area of Wiring
Wire (AWG)
mm? (AWG 10) or greater x 4
mm? (AWG 12) or greater x 1
mm? (AWG 12) or greater x 1
won
Self-tapping
screw
PTT
ad
yyy
(04 x 16 mm) tip
Lee
a ==> yy,
Installation
board,
etc.
+e....,
2%
g
(thickness : 15 mm or more) RR
a7? Zor
Ligy
¢
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.)
tena]
osm
[im
[am
|
am
_|
PACAKeable
|
CAS
|
CAIZSL
|
CADeSL
|
——_|
RGA
cabie
fo7mm)
|
CASWL
|
CAT3WL
|
CAZaWL
|
——
|
CABW
cAaEW
|
——_
|
CABEW
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.
e
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.
e
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.
e
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.
:
e
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
9

System examples
@ Full-range 2-channel system
KAC-728S/608S/428S
TER OPERATION
1} Left speaker
ft] Right speaker
KAC-728S/608S/428S
OPERATION
FILTER
OFF LPF STEREO MONO(Lch)
Ee” Com
if Left speaker (Bridged)
ig Right speaker (Bridged) .
FILTER OPERATION
KAC-728S/608S/428S
FILTER OPERATION
OFF LPF STEREO MONO{Lch)
Cy
(L + R)
(Bridged)
KAC-728S/608S/428S Subwoofer
LPF STEREO MONO(Lch) iq (L + R)
ee
:
(Bridged)
A
;
@Principle of Tri-mode
Method
of
frequency
band
division
using
a
coil
and
capacitor--rin
case
of
6dB/oct.
slope
Coil (L): Passes low frequencies and blocks high
frequencies. (Low pass)
Capacitor
(C):
Passes
high
frequencies
and
blocks
low
frequencies.
(High
pass)
C= 159000 (uF)
=FoxR
fc=Cut
of
Frequency
(Hz)
Frequency = 1px R (mH) R=Speaker Impedance a
@Example:
aa
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
©
(uF)
and
the
coil
rating
should
be
as
close
as
possible
to
5.3
(mH).
.
ACAUTION
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.
-
e
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