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5

1

RCA cable ground lead terminal

2

FILTER switch

These switches allow filtering of the
speaker output signals.

• 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.

3

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-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.)

4

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.

5

LINE IN terminal

6

Speaker level input terminals

7

Fuse (20 A 

×

2 : KAC-728)

Fuse 

(25 A 

×

1 : KAC-628)

Fuse 

(15 A 

×

1 : KAC-528)

8

Battery terminal

9

Ground terminal

0

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 2

or greater. When

multiple speakers are to be connected,
ensure that the combined impedance is 2

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

or greater. When

multiple speakers are to be connected,
ensure that the combined impedance is 4

or greater.

The rated input of the speakers should be
no less than the maximum output of the
amplifier. Otherwise malfunction may
result.

2

CAUTION

NOTE

MAX

MIN

0.3

0.5

1.0

(W)

25

15

10

LPF

FILTER

OFF

KAC-728/528

LPF

FILTER

HPF

OFF

KAC-628

MONO(Lch)

STEREO

OPERATION

KAC-728/528

MONO(Lch)

STEREO

L+R

OPERATION

KAC-628

Summary of Contents for KAC-628

Page 1: ...KAC 728 KAC 628 KAC 528 POWER AMPLIFIER INSTRUCTION MANUAL B64 1360 00 EM ...

Page 2: ...light 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 short circuits when replacing a fuse first disconnect the wiring harness If you experience problems during installation consult your Kenwood...

Page 3: ...ctrical ground passing electricity to the battery s negative terminal 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 cables 5 Connect the power cable power control cable and grounding ...

Page 4: ...T FUSE 25A POWER IN BATT P CON REMOTE GND LEFT BRIDGED RIGHT SPEAKER OUTPUT POWER AMPLIFIER 25 LPF FILTER HPF MONO Lch STEREO OFF L R OPERATION GND INPUT SENSITIVITY V MAX MIN 0 3 0 5 1 0 L R LINE IN LEFT RIGHT SPEAKER LEVEL INPUT LPF FILTER OFF MONO Lch STEREO OPERATION GND INPUT SENSITIVITY V MAX MIN 0 3 0 5 1 0 L R LINE IN LEFT RIGHT SPEAKER LEVEL INPUT FUSE 20A x 2 POWER IN BATT P CON REMOTE G...

Page 5: ...e 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 5 LINE IN terminal 6 Speaker level input terminals 7 Fuse 20 A 2 KAC 728 Fuse 25 A 1 KAC 628 Fuse 15 A 1 KAC 528 8 Battery terminal 9 Ground terminal 0 Power control REMOTE te...

Page 6: ...Right output Red Left input Right input 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 Connect the power control lead to a power supply which can be turned ON OFF by the ignition key switch ACC line Wit...

Page 7: ...ers 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 2Ω or greater for stereo connections or 4Ω 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 conn...

Page 8: ... iron plate by using Grommets Connect the ground cable 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 cable is not connected Be sure to attach a protective fuse into the battery cable close to the battery Use a protective fuse having a capacity that is about 10 A higher than the maxi...

Page 9: ...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 instal...

Page 10: ... 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 R L R L R L R L R L R L R L R L R L R L R L C C MONO Lch STEREO OPERATION MONO Lch STEREO L R OPERATION KAC 728 528 KAC 628 LPF FIL...

Page 11: ...e may be blown because the volume was too high The input sensitivity adjusting control is not set to the correct position The speakers cable are connected with wrong polarity A speaker cable 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 Protection function Replace the fuse with a new fuse and use a lowe...

Page 12: ...W 2 75 W 2 50 W 2 Frequency Response 0 1 dB 5 Hz 50 kHz 10 Hz 45 kHz 5 Hz 50 kHz Signal to Noise Ratio 100 dB 100 dB 100 dB Sensitivity MAX rated output 0 2 V 0 15 V 0 2 V Sensitivity MIN rated output 5 0 V 4 0 V 5 0 V Input Impedance 10 kΩ 10 kΩ 10 kΩ Low Pass Filter 12 dB oct 80 Hz 80 Hz 80 Hz High Pass Filter 12 dB oct 150 Hz General KAC 728 KAC 628 KAC 528 Operating Voltage 11 16 V allowable 1...

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