KENWOOD KAC-648 - Owner's Manual Immediate Download

KAC-648

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

B64-1364-00 (EM)

2

Safety precautions

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 amplifier

stops operating.

s 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.

s The protection function activates in the following

situations:

· When a speaker cable may be short-circuited.

· When a speaker output contacts ground.

· When the temperature of internal parts exceeds 120°C (248°F).

· When a ground cable 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

To prevent injury and/or fire, take the

following precautions:

· When extending the battery or ground

cables, make sure to use automotive-grade

cables or other cables with an area of 3 mm

2

(AWG12) or more to prevent cable

deterioration and damage to the cable

coating.

· To prevent short circuits, never put or leave

any metallic objects (e.g., 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 short circuits 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.

Accessories

2CAUTION

NOTE

2CAUTION

2WARNING

Part name

Number of

Items

External

View

Round terminal

(Large)

1

Round terminal

(Medium)

2

Round terminal

(Small)

1

Terminal cover

(Power terminal)

1

Self-tapping screws

(ø4

× 16 mm)

4

3

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 cable 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.

· If the fuse blows, check cables 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 cables to appropriate speaker connectors separately. Sharing the negative

cable of the speaker or grounding speaker cables 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.

2CAUTION

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.

· Use the extension cables. (Optional.)

· 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

,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,

Installation board, etc.

(thickness : 15 mm or more)

Self-tapping screw

CA-2SL

CA-12SL

CA-22SL

CA-52SL

RCA cable

CA-3WL

CA-13WL

CA-23WL

CA-53WL

RCA cable (ø7mm)

CA-5W

CA-15W

CA-25W

CA-45W

CA-65W

RCA cable (ø12mm)

0.5m

1m

2m

4m

5m

6m

Type

Length

1

Fuse (25 A

× 1)

2

Battery terminal

3

Ground terminal

4

Power control (REMOTE) terminal

5

Amplifier A speaker output

terminals

6

Amplifier B speaker output

terminals

ySPEAKER 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.

7

Speaker level input terminals

8

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.

9

Amplifier A LINE IN terminal

0

Amplifier B LINE IN terminal

2CAUTION

4

Controls

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.

A

B

A

B

SPEAKER LEVEL INPUT

R

L

LEFT

RIGHT

SPEAKER LEVEL INPUT

LEFT

BRIDGED

RIGHT

A

B

SPEAKER OUTPUT

POWER IN

FUSE(25A)

BATT

P.CON(REMOTE)

GND

25

LINE OUT

INPUT

SENSITIVITY(V)

CONTROL

OPERATION

4 CHANNEL

POWER AMPLIFIER

L

R

B

LPF

OFF

FILTER

HPF

B

A

(Lch)

MONO

MAX

MIN

0.3

0.5

1.0

STEREO

+

INPUT

SENSITIVITY(V)

MAX

MIN

0.3

0.5

1.0

CONTROL

INPUT SELECTOR

L

A

B

GND

MONO

R

LINE IN

A

B

LPF

OFF

FILTER

HPF

OPERATION

MONO(Lch)

STEREO

1

5

2 3 46

7

8

#

$

%

9 0!

@

INPUT SELECTOR

A

B

A

m

A

m

!

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.

@

RCA cable ground lead terminal

#

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.

$

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 150Hz or higher are

output. (Frequencies below 150Hz are cut.)

· LPF(Low Pass Filter) position:

Only frequencies of 80Hz or lower are

output. (Frequencies above 80Hz 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.

NOTE

5

MAX

MIN

0.3

0.5

1.0

10

15

25

4.0

0.2

3.0

2.0

0.3

0.5

1.0

(W)

(V)

System examples

L

R

L

R

L

R

L

R

L

R

LINE

OUT

A

B

L

R

INPUT

SENSITIVITY(V)

CONTROL

OPERATION

B

CONTROL A

(Lch)

MONO

MAX

MIN

0.3

0.5

1.0

STEREO

INPUT

SENSITIVITY(V)

MAX

MIN

0.3

0.5

1.0

INPUT SELECTOR

A

B

LPF

OFF

FILTER

HPF

OPERATION

MONO(Lch)

STEREO

LPF

OFF

FILTER

HPF

s Full-range 4-channel + Subwoofer system

CENTER UNIT

Front

speaker

Rear

speaker

Subwoofer

Power amplifier

Switch setting