Kenwood KAC-721 User manual

COOMN=A»
KAC-721
STEREO
POWER
AMPLIFIER
INSTRUCTION
MANUAL
AMPLIFICATEUR
DE
PUISSANCE
STEREO
EMPLOI
STEREO-ENDSTUFE
BEDIENUNGSANLEITUNG
AMPLIFICATORE
DI
POTENZA
STEREO
ISTRUZIONI
PER
L’'USO
KENWOOD
CORPORATION
@©PRINTED IN JAPAN B50-7909-00(E, T)(T)
90/12 1110987654321 89211109

ENGLISH
CARE AND MAINTENANCE
Sy ai en NI ee PR, Tie ee ee oe a
® The power source of this unit is exclusively DC 12 V, negative ground.
¢ Do not place the amplifier in a place where the amplifier may be exposed to direct sun-
light, heat or moisture. Be careful that metal objects and water do not enter the set.
¢ If you have difficulty in installing the set in your car, please contact with your KENWOOD
dealer.
Cleaning
Clean with a dry silicone cloth or a soft cloth. The use of thinner, alcohol or other solvents
may damage the surface finish.
2 (En)

ACCESSORY
No.
Part
name
External
View
Number
of
units
@
Power
connection
cord
1
I
4
@®
Extension
cable
1
rae
Satie
:
@
Tapping
screws
(¢4
x
45)
O-———rom
4
J
(En) 3

CONNECTIONS
@
INSTALL
MANNER
GSS
a
a
ek
ae
1. Before installation and wiring, remove
the (—) terminal of the battery to pre-
vent short-circuiting.
2. Connect the input and output cords
of the system.
3. Connect the ground to the metal
chassis of the car.
4. Connect the back-up power supply
lead (yellow).
5. Install the set and after confirming the
installation and wirings are correct,
connect the (—) terminal of the
battery.
RCA pin cord
Left in (White)
Right in (Red)
e {fa fuse is blown, first check that the
associated wires are not short-
circuited then replace the fuse with a
; @) Power connection cord
new one having the same capacity.
Ground (Black) ©
(Green stripe)
4 en)

¢ Input sensitivity control
Power control The input sensitivity. contro! adjusts the input sensitivity wi-
power
supply
thin
a
range
of
0.1
V
to
5.0
V
continuously,
enabling
ex-
pansion with various systems. This unit has been set for
0.3V.
KENWOOD
head
unit
preout
level
ae
ad
(MAX.)
Amplifier
input
sensitivity
300 mV 0.1 V
1V 0.3~0.5 V
CASSETTE RECEIVER,
GRAPHIC EQUALIZER
etc.
(optional)
aa a a pil
= Output |
| CASSETTE RECEIVER, | | 77 CAUTION
GRAPHIC EQUALIZER |
Do not connect the set to two
etc.
input systems at a time. |
(optional) | L
~ Connect the ground lead to the
metal part which is connected
to the (—) terminal of the
battery.
Details of DIN
Right channel
@® (Red)
Ground ©
Power-control
(Orange)
Left channel
@® (White)
vm
Power supply (Yellow) @®
Battery
@
Left speaker
©
®
Right speaker
rs)
(En) 5
HSIDN2

INSTALLATION
1. Installation
¢When
installing
to
the
car,
install
the
unit
se-
curely
for
safety
driving.
¢Use screws supplied as
accessories when install-
ing the unit.
e install the unit in a well-
ventilated place and do
not place the (heavy) ob-
ject on it.
7 CAUTION
| When making the hole,
| do not damage the fuel |
| tank, brake tube, wiring
harnesses, etc. on the
| other side.
2. Installation location
®
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
hinderances.
As
generally
accepted
positions
for
its
installation,
places
such
as
under
the
front
seat
or
inside
the
trunk,
etc.
can
be
considered.
¢
Use
the
extension
cables.
CA-8L
(0.5
m),
CA-18L
(1
m),
CA-28L
(2
m),
CA-48L
(4
m),
and
CA-68L
(6
m)
(optional)
when
the
connected
models
are
to
be
installed
away
from
the
power
amplifier.
6 (En)

TROUBLESHOOTING GUIDE
What often appears to be a malfunction is often due to user error in operation or connection.
When trouble occurs with your unit, please check the following before calling for service.
Symptom Cause Remedy
The sound level is low. | A speaker cord has become uncon- | Check the speaker cord con-
(No sound from one | nected. nections.
side.)
The sound quality is | 1. The speakers are connected to | 1. Connect each speaker terminal
bad. (The sound is dis- the same wires. to its respective speaker output.
torted.) 2. A speaker cord is pinched by a | 2. Check the speaker wiring.
screw in the car body.
SPECIFICATIONS
Specifications subject to change without notice.
Audio section
Max Power Output-(1-kH2).4 Deities Gaia idenl bel ecevccdalicscereebaceveess ves 70 W+70 W
Rated output power (less than 0.5% THD, 20 Hz - 20 kHz, 4 Q)........... 37 W+37 W
Frequency Response (—3 dB) ...... ccc cece cece e ee ee ee ee ee ee tate eneueatueu sarees 2 Hz - 70 kHz
Sensitivity (rated Output) MAX. 0... cece cee ce cece ee eeeeeeeenensateesesesanaenens 0.1 V
NAVIN, op sesegrcite cam ciate ina trdaedcuaditecueranecth sedated etek meta 5.0 V
Sidnalito (NOISC RatiOvistewcteseus sediuvvorbengnneewotandetdases ds etebiineda dh sabageus weedeasy 105 dB
IAPUt: IMPCAUANCE! As coeds etcs eed teh aard ead Sunda wndiin Gueneeai aa Sah elec Pou thus wena takee oe 10 kQ
Damping, Factor (VOOHZ) sicsescsciis each ied inmate Hae Sine Meebderdtnnd get More than 100
General
Operating: VOMage: sex sma vieersia A Hadi eoetsgundidduewesaeedeeds 14.4 V (11 - 16 V allowable)
Current Consumption (MAX) csc civcs aacveae cn Mv elds vasun cues diganeeveddedads ma chgaa dae cowed 9.5A
DIMenSiONS$(WEX FX D)iscicasedescewcnncas sig. ney trad mates aiinek oa beeteoresieeen 220 x 45 x 150 mm
WGN AT scieeitrvs tein aecaalena shelves eitek cance eatiudih cate cesar elke taba toda eh tin hele aduannsnd ip cade 1.6 kg
{En} 7
HSI9NAa

CGOO/ANS>D|
STEREO POWER AMPLIFIER
KAC-721
INSTRUCTION MANUAL
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 pow-
er amplifier.
For your records
Record the serial number found on the bottom 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 informa-
tion or service on this product.
Model KAC-721 Serial number
@©PRINTED IN JAPAN B50-7906-00(K)(T)
90/12 1110987654321 89/1211109

TROUBLESHOOTING GUIDE
I
ga
PE
I
ING
TET
MRI
SS
I
lt
PE
EES
What
often
appears
to
be
a
malfunction
is
often
due
to
user
error
in
operation
or
connection.
When
trouble
occurs
with
your
unit,
please
check
the
following
before
calling
for
service.
Symptom Cause Remedy
The
sound
level
is
low.
|
A
speaker
cord
has
become
uncon-
|
Check
the
speaker
cord
con-
(No
sound
from
one
|
nected.
nections.
side.)
The
sound
quality
is
|
1.
The
speakers
are
connected
to
|
1.
Connect
each
speaker
terminal
bad.
(The
sound
is
dis-
the
same
wires.
to
its
respective
speaker
output.
torted.)
2.
A
speaker
cord
is
pinched
by
a
|
2.
Check
the
speaker
wiring.
screw in the car body.
SPECIFICATIONS
a
Specifications subject to change without notice.
Audio section
Max
Power
Output
(1
kHz,
4.Q)....0...c
cece
ccceeceueceuseeueseuuceuareseens
70
W+70
W
Rated
output
power
(less
than
0.5%
THD,
20
Hz
-
20
kHz,
4Q)...........
37
W+37
W
Frequency
Response
(—3
dB)............cccccccccccesaccuceucseceuetaeseuseuesereeuss
2
Hz
-
70
kHz
Sensitivity
(rated
output)
MAX.
.0.......
ccc
ccecccecceeceeceveseuessuesceetuureeueteueeenneenes
0.1
V
MUNG
cotidisey
fon
etree
gycay
Pentetehds
iia
ecaenite
ce
thicesslauvamiuarecns
vOeeE
5.0
V
sighal.
o"NOiSe:RatlO
x2
ccwe
pes
Hennes:
ch
dado
avs
vee
nic
hued
dans
Ghdbrdds
x
ehivadued
da.teedebtss
105
dB
[ip
IMPSAAnCE:s..:.s5322.acecacaden
aed.
dadeSalaooretaae
cinta
duat
lec.)
deuce
wlan
coo
anlecn
eee
10
kQ
Damping
Factor
(100
HZ)
..........cccceeececcceseeecusccuecceuseseueceerateeeauansees
more
than
100
General
Operating.
VOMa
gS
wc
jscceitecic
tes
ciakaas
es
Miele
nniecivedeteeadeah
ants
14.4
V
(11
-
16
V
allowable)
Current
Consumption
(MAX)
...........cccccceccessecsecuccaeseceueseeseuesusetarsenccuteuteerrens
9.5A
Dimensions
(WX
HX
D)..........ccccccceccesceceeeeseeseueeusertanseseuneeenes
220
x
45
x
150
mm
(8-11/16 x 1-3/4 x 5-7/8 in.)
WV
GIGb
es
nice
cette
Ce
ka ee
he
rats
hee
eet
tdin
Manat
Aad
1.6
kg
(3.5
Ib)

Ay WARNING
TO PREVENT ELECTRIC SHOCK,
FIRE AND OTHER INJURY.
PLEASE NOTE THE FOLLOWINGS:
¢
To
keep
good
ventilation,
do
not
anything
¢
Do
not
drop
pieces
of
metal,
needles,
on
top
of
the
unit.
coins
and
other
electrically
conductive
materials
into
the
unit.
¢
The
unit
is
designed
to
be
connected
¢
Do
not
place
the
unit,
where
it
will
be
ex-
12
V
DC
and
negative
grounding.
posed
to
direct
sunlight
or
close
to
heat-
ing
device.
¢
Do
not
open
enclosure,
such
as
front
¢
Do
not
dash
water
on
the
unit.
panel,
top
or
bottom
cover.

Do not place the unit in areas of exces-
sive dust, high humidity or on unstable
surfaces.
CLEANING
1. Turn the power off, before cleaning the
unit.
2. Do not use any type of abrasive pad, thin-
ner, benzine and any such kind of
objects.
3. Wipe the front panel and other exterior
surfaces of the unit with a soft dry cloth
or a soft cloth lightly moistened with a
neutral detergent.
e
|f
an
abnormal
smell
or
smoke
is
detect-
ed,
immediately
turn
the
power
off.
@
If
you
have
difficulty
in
installing
the
set
in
your
car,
please
contact
your
KENWOOD
dealer.

ACCESSORY
No. Part name External View Number of
units
@ Power connection cord 1
@ RCA pin cord 1
ie aaa
@ | Tapping screws (64x 45) O-———r 4

INSTALLATION
1. Installation
[ @ Tapping screws (64 x 45)
eWhen installing to the
car, install the unit se-
curely for safety driving.
eUse screws supplied as
accessories when install-
ing the unit.
¢ {install the unit in a well-
CAUTION ventilated place and do
When making the hole, not place the (heavy) ob-
do not damage the fuel ject on it.
tank, brake tube, wiring
harnesses, etc. on the
other side.
2. Installation location
e 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 hinderances.
As generally accepted positions for its installation, places such as under the front seat
or inside the trunk, etc. can be considered.
e Use the extension cables. CA-8L (0.5 m), CA-18L (1 m), CA-28L (2 m), CA-48L (4 m),
and CA-68L (6 m) (optional) when the connected models are to be installed away from
the power amplifier.

CONNECTIONS
@ INSTALL MANNER
. Before installation and wiring, remove
the (—) terminal of the battery to pre-
vent short-circuiting.
. Connect the input and output cords
of the system.
. Connect the ground to the metal
chassis of the car.
. Connect the back-up power supply
lead (yellow).
. Install the set and after confirming the
installation and wirings are correct,
connect the (—) terminal of the
battery.
if a fuse is blown, first check that the
associated wires are not short-
circuited then replace the fuse with a
new one having the same capacity.
¢ Input sensitivity control
‘
The
input
sensitivity
control
adjusts
the
input
sensitivity
wi-
= Power control power supply : : v
Power
come
ee)
ieee
thin
a
range
of
0.1
V
to
5.0
V
continuously,
enabling
ex-
EE
POWER
CONT
pansion
with
various
systems.
This
unit
has
been
set
for
0.3V.
KENWOOD yee preout level Amplifier input sensitivity
1V 0.3~0.5V
CASSETTE RECEIVER,
GRAPHIC EQUALIZER
etc.
|
|
|
|
300 mV 0.1V |
|
|
|
|
|
eee ee
CASSETTE RECEIVER,
GRAPHIC EQUALIZER
etc.
Do not connect the set to two
(optional) |
input systems at a time.
KAC-721
ees
Se
te
eae
esis
2
Fuse
Input
Details of DIN
Ground
©
bal
Connect the ground lead to the
metal part which is connected
to the (—) terminal of the
battery.
Left in (White)
Right in (Red)
Ignition key switch
Power-control
(Orange)
Left channel
@
Power
connection
cord
®
(White)
Ground (Black) ©
Power supply (Yellow) ©
Battery
(Green stripe)
re
Left
speaker
(Gray stripe)
4%
328,
O0@® O0@