Kenwood B64-2562-00/00 User's Manual

Kenwood Stereo Amplifier User's Manual - B64-2562-00/00.
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System examples 

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.

To prevent fire caused by a short in the wiring,
connect a fusible link or breaker nearby the
battery’s positive terminal.

• 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 cables or connectors

are touching the car body. Do not remove caps from
unconnected cables 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.

■ Speaker level input terminals (!)

• The genuine-accessory car stereo shall have a

maximum power output of no more than 40 W.

• Do not connect the speaker output leads from

a power amplifier (Optional) to the speaker
level 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 level 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.

■ Power terminal (234)

Connect to their respective terminals the 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.

■ Accessories

Installation

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.

• 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.

2CAUTION

2CAUTION

2WARNING

L

R

L

R

L

R

L

R

L

R

L

R

L

R

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-5201

KAC-6201

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

L

R

L

R

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-5201

KAC-6201

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-5201

KAC-6201

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

7

8

7

8

7

8

7

8

7

8

7

8

KAC-6201

KAC-5201
POWER AMPLIFIER  
INSTRUCTION MANUAL

© B64-2562-00/00 (MV)

Specifications
Specifications subject to change without notice.
Audio Section ........................................................................KAC-6201

KAC-5201

Max Power Output  ..............................................................................................350 W 

× 1

250 W 

× 1

Rated Power Output (4 

Ω)

Normal (20 Hz – 20 kHz, 0.08 % THD)................................................................60 W 

× 2

40 W 

× 2

Bridge (1 kHz, 0.8 % THD) ................................................................................150 W 

× 1

120 W 

× 1

Rated Power Output (2 

Ω)

Normal (1 kHz, 0.8 % THD) ................................................................................75 W 

× 2

60 W 

× 2

Frequency Response (+0, –1 dB) ..................................................................10 Hz – 45 kHz

5 Hz – 50 kHz

Signal to Noise Ratio ..................................................................................................100 dB

100 dB

Sensitivity (MAX) (rated output) ....................................................................................0.2 V

0.2 V

Sensitivity (MIN) (rated output) ......................................................................................5.0 V

5.0 V

Input Impedance ..........................................................................................................10 k

10 k

Low Pass Filter (12 dB/oct.) ..........................................................................................80 Hz

80 Hz

High Pass Filter (12 dB/oct.) (KAC-6201 only) ............................................................150 Hz

General....................................................................................KAC-6201

KAC-5201

Operating Voltage (11 – 16 V allowable) ......................................................................14.4 V

14.4 V

Current Consumption (1 kHz, 10% THD) ......................................................................19 A

16 A

Dimensions (W 

× H × D)[mm] ........................................................................228 × 59 × 228

228 

× 59 × 160 

Dimensions (W 

× H × D)[inch]..........................................................................9 × 2-5/16 × 9

× 2-5/16 × 6-5/16

Weight ............................................................................................................2.8 kg (6.1 lbs)

2.1 kg (4.6 lbs)

Safety precautions

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 3mm2 (AWG12) 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.

• 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.

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.

■ 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 wire 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 install a protective fuse in the power

cord near the battery. The protective fuse should
be the same capacity as the unit’s fuse capacity
or somewhat larger.

• For the power cord and ground, use a vehicle

type (fireproof) power wring cord with a current
capacity greater than the unit’s fuse capacity.
(Use a power wiring cord with a diameter of 3
mm2 (AWG 12) or greater.) 

• 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.

■ 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 2

Ω or greater (for

stereo connections), or 4

Ω 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.

2CAUTION

NOTE

2CAUTION

2WARNING

Part name

Number of

Items

External

View

Terminal cover

(Power terminal)

1

Self-tapping screws

(ø4 

× 16 mm)

4

Installation board, etc.
(thickness : 15 mm or more) 

Self-tapping screw
(ø4 

× 16 mm) 

25

4

3

2

Operations of the following control and switches
are required in accordance with the center unit
and speakers connected with this unit. 

Fuse 

25 A 

× 1 : KAC-6201

15 A 

× 1 : KAC-5201

If you can’t find the specified capacity fuse at your
store etc., consult your Kenwood dealer.

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.

• 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.)

RCA cable ground lead terminal

When using an RCA cable with a ground lead
attached, connect the ground lead to this terminal.

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.

FILTER switch

These switches allow filtering of the speaker
output signals.
• HPF (High Pass Filter) position (KAC-

6201 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.

• STEREO position

The amplifier can be used as a stereo amplifier. 

• L+R position (KAC-6201 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 right as a guide.

For the pre-output level or the maximum power
output, refer to the “Specifications” in the
instruction manual of the center unit.

LINE IN terminal

Speaker level input terminals

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 is activated

in the following situations:
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.
• When a speaker wire may be short-circuited.
• When a speaker output contacts ground.
• When the unit malfunctions and a DC signal is

sent to the speaker output.

• When the internal temperature is high and unit

won’t operate.

• 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.

NOTE

2CAUTION

NOTE

Controls

25

INPUT

SENSITIVITY(V)

MAX

MIN

0.3

0.5

1.0

(W)

20

15

10

9

0

89

!

6

1 234

5

7

0

89

!

6 7

KAC-6201
KAC-5201

KAC-6201

KAC-5201

Power indicator 

Terminal cover 

Battery 

Ground wire* 

Battery wire* 

Protective Fuse* 

Power control wire* 

■ Power wire connection 

L

R

L

R

L

C

C

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-5201

KAC-6201

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

7

8

7

8

Connection 

For safe installation, read "Installation procedure" before starting work.

NOTE

25

25

GND

LEFT

BRID

GE

D

RIGHT

LEFT

BRIDG

ED

RIGHT

LE

FT

RIG

HT

SPEAKER LEVEL INPUT

4

6

!

5

5

4

CENTER UNIT (Cassette receiver,
CD receiver, etc.) 

Power control wire* 

RCA cable* 

Genuine-accessory car stereo (No
line output center unit etc.) 

ACC

Battery 

Car fuse box 

Lead terminal* 

Subwoofer 

Lead terminal* 

Right speaker 

Left speaker 

Speaker 

■ 2-channel system 

■ 1-channel system 

■ Subwoofer system

■ RCA cable connection  

■ Speaker level input connection 

■ Speaker stereo connection 

■ Speaker bridge connection

CENTER

UNIT 

CENTER

UNIT

CENTER

UNIT

■ Tri-mode 

Principle of Tri-mode

Method of frequency band division using a coil
and capacitor ... in 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)

Example:

When it is required to set a crossover
frequency of 120 Hz using speakers with an
impedance of 4 ohms.
fc=Cut of Frequency (Hz)
R=Speaker Impedance (

Ω)

• 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.

2CAUTION

L

C

0 dB

-3 dB

Crossover Frequency 

Frequency 

CENTER

UNIT 

High pass 

Subwoofer
(L + R) 

159000

C=                (µF)

fc x R

159 x R

L=                (mH)

fc

159000

=                       = 331.25 µF

120Hz x 4

159 x 4

=                       = 5.3 mH

120Hz

Left speaker

Right speaker

Left speaker

Right speaker

Left speaker

Right speaker

Subwoofer 

PROBLEM

POSSIBLE CAUSE

SOLUTION

No sound.
(No sound from one side.)

(Blown fuse.)

The output level is too
small (or too large).

The sound quality is bad.
(The sound is distorted.)

• Input (or output) cables are

disconnected.

• Protection circuit may be

activated.

• Volume is too high.

• The speaker cord is shorted.

The input sensitivity adjusting
control is not set to the correct
position.

• 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 the input (or output)

cables.

• Check connections by referring

to "Power indicator".

• Replace the fuse and use lower

volume.

• After check the speaker cord and

fixing the cause of the short,
replace the fuse.

Adjust the control correctly
referring to "Controls".

• 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".

Lead terminal* 

*Commercially available parts 

4

4

4

4

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.

放大器
使用說明書

25W or greater

KAC-6201

KAC-5201

  KAC-6_5201(M)1En  02.10.10  5:40 PM  Page 1

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