KENWOOD KAC-746 Owner's Manual

KENWOOD KAC-746 Owner's Manual
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Owner's Manual for KENWOOD KAC-746, downloadable as a PDF file.

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KAC-746

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

KAC-746

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

Safety precautions

Take the following precautions to

prevent fire and avoid personal

injury :

· When extending the battery cable, or

ground cable, use 5mm2 (AWG10) or

larger automotive grade cable to avoid

cable deterioration or damage to the

covering.

· Check that no metal objects (coins, tools,

etc.) are left inside the unit to avoid short

circuits.

· If you smell or see smoke, turn the

power off 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.

Take the following precautions to

keep the unit in proper working

order.

· Be sure the unit is connected to a 12V

DC power supply with a negative ground

connection.

· Do not open the top or bottom cover.

· Do not install the unit in places it is

exposed to direct sunlight, high heat or

humidity, water may splash over it, or

dust exists.

· If you have difficulty in installing this unit

in your vehicle, contact your Kenwood

dealer.

Cleaning the unit

· If the surface is dirty, wipe it clean with a

silicon cloth or soft dry cloth with the

power off.

Do not use hard cloths or paint thinner,

alcohol, or other volatile solvents. These

may damage external surfaces or remove

indicator characters.

2CAUTION

NOTE

2CAUTION

2WARNING

Accessories

Part name

Number

of Items

External

View

Battery cable

(Yellow) (6 m)

Ground cable (Black)

(1 m)

Self-tapping screws

(ø4

× 16 mm)

Terminal cover

(Power terminal)

Part name

Number

of Items

External

View

Round terminal

(Large)

Round terminal

(Medium)

Round terminal

(Small)

Grommets

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.

· After installing the unit, check to make sure that electrical equipment such as the brake lamps,

turn signal lamps and windshield wipers operate normally.

· Install the unit securely in a location that does not interfere with driving.

2CAUTION

Installation board, etc.

(thickness : 15 mm or more)

Self-tapping screw

(ø4

× 16 mm)

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

Type

Length

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.

LINE OUT

INPUT

SENSITIVITY(V)

CONTROL

FREQUENCY(Hz)

OPERATION

4 CHANNEL

POWER AMPLIFIER

LPF

OFF

FILTER

HPF

MONO(Lch)

MAX

MIN

0.3

0.5

1.0

200

STEREO

L + R

200

150

100

HPF

LPF

100

150

CONTROL

INPUT SELECTOR

FREQUENCY(Hz)

LPF

OFF

FILTER

HPF

200

150

100

HPF

LPF

100

150

INPUT

SENSITIVITY(V)

MAX

MIN

0.3

0.5

1.0

OPERATION

GND

MONO

MONO(Lch)

STEREO

L + R

LINE IN

% ^

SPEAKER LEVEL INPUT

LEFT

RIGHT

SPEAKER LEVEL INPUT

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

BRIDGED

POWER IN

FUSE(30A)

BATT

P.CON(REMOTE)

GND

2346

Amplifier A

Amplifier B

1 Fuse (30 A)

2 Battery terminal

3 Ground terminal

4 Power control (REMOTE) terminal

5 Amplifier A speaker output terminals

6 Amplifier B speaker output terminals

7 Speaker level input terminals

8 FREQUENCY control

When the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position,

the threshold frequency can be adjusted with this control.

9 FILTER switch

High-pass or low-pass filtering can be applied to the speaker output according to the setting

of this switch.

0 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.

· L+R position:

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.

@ RCA cable ground lead terminal

# INPUT SELECTOR switch

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

· AB 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.

$ Amplifier A LINE IN terminal

% Amplifier B LINE IN terminal

^ 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.

NOTE

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 output contacts ground.

· When the unit malfunctions and a DC signal is sent to the speaker output.

· 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

MAX

MIN

0.3

0.5

1.0

(W)

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