Kenwood KAC-6401 Owner's Manual | Page 2

Kenwood Audio Owner's Manual - KAC-6401.
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System examples 

L

R

L

R

A

B

A

B

L

R

L

R

A

B

L

R

L

R

A

B

L

R

L

R

A

B

L

R

L

R

A

B

L

R

L

R

A

B

L

R

L

R

!

@

#

F

R

LPF

HPF

OFF

B.CH FILTER

A.CH FILTER

LPF

HPF

OFF

@

LPF

HPF

OFF

B.CH FILTER

A.CH FILTER

LPF

HPF

OFF

@

LPF

HPF

OFF

B.CH FILTER

A.CH FILTER

LPF

HPF

OFF

B.CH OPERATION

INPUT SELECTOR

MONO (Lch)

STEREO

A.CH OPERATION

MONO (Lch)

STEREO

A

A

B

!

#

B.CH OPERATION

INPUT SELECTOR

MONO (Lch)

STEREO

A.CH OPERATION

MONO (Lch)

STEREO

A

A

B

!

#

B.CH OPERATION

INPUT SELECTOR

MONO (Lch)

STEREO

A.CH OPERATION

MONO (Lch)

STEREO

A

A

B

!

#

B.CH OPERATION

INPUT SELECTOR

MONO (Lch)

STEREO

A.CH OPERATION

MONO (Lch)

STEREO

A

A

B

25

4

3

2

L

A

A

R

L

R

B

A

B

B

GND

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.

Fuse (25 A)

Battery terminal

Ground terminal

Power control terminal

Amplifier A/B 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.)

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.
The sensitivities of amplifiers A and B can be
adjusted independently regardless of the position
of the input selector switch.
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.

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.

Amplifier A/B LINE IN terminals

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.

Speaker level input terminals

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.

• 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.)

FILTER switch

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

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.

INPUT SELECTOR switch

This switch selects the input method of the signals
to be amplified by amplifiers A and B.
• 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.

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.

2CAUTION

NOTE

Controls

6

0.2(MAX)

(MIN)5

0.3

0.5

1

2

3

4

INPUT SENSITIVITY(V)

25

1

9

2

3 4

7

5

0

!

#

8

@

6

(W)

30

40

20

10

Power indicator 

Terminal cover 

Battery 

Ground wire* 

Battery wire* 

Protective Fuse* 

Power control wire* 

■ Power wire connection 

L

C

C

L

C

C

!

@

#

L

R

L

R

L

R

L

R

A

B

LPF

HPF

OFF

B.CH FILTER

A.CH FILTER

B.CH OPERATION

INPUT SELECTOR

MONO (Lch)

STEREO

A.CH OPERATION

MONO (Lch)

STEREO

LPF

HPF

OFF

A

A

B

Connection 

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

NOTE

25

25

4

4

L

L

A

A

L

A

A

B

R

B

R

L

R

R

L

R

A

R

B

B

L

A

R

L

R

B

L

B

LEFT

BRIDGED

RIGHT

A

B

BRIDGED

R

L

LEFT

BRIDG

ED

RIGHT

A

B

BRIDGED

R

L

7

5

5

GND

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* 

Lead terminal* 

■ 4-channel 

■ 4-channel 

■ 3-channel 

■ 2-channel 

■ 2ch + woofer

■ 2-channel 

■ RCA cable connection  

■ Speaker level input connection 

■ Speaker stereo connection 

■ Speaker bridge connection

CENTER

UNIT 

CENTER

UNIT

CENTER

UNIT

■ 2-channel 

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

Front left speaker

Front right speaker
Rear left speaker

Rear right speaker

Left speaker

Right speaker

Left speaker

Right speaker

Subwoofer 

Lead terminal* 

Bridge

Bridge

White
White/Black
Gray
Gray/Black
Green
Green/Black
Purple
Purple/Black

A-channel

A.ch Left 

A.ch Right 

B-channel

B.ch Left 

B.ch Right 

Front

Rear

Cable Color of the
connector

F

R

*

Commercially available
parts 

Description of markings in the figure.

  KAC-6401(KE)1En  02.10.8  10:07 AM  Page 2

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