kac-749s ETC-unknow, kac-749s Datasheet

kac-749s

Manufacturer Part Number

kac-749s

Description

4-channel Power Amplifier

Manufacturer

ETC-unknow

Datasheet

1.KAC-749S.pdf (2 pages)

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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.

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output (4 ½)

Rated Power Output (4 ½)

Rated Power Output (2 ½)

Frequency Response (+0, –3 dB) ......................................5 Hz ~ 50 kHz

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

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

Sensitivity

Input Impedance ............................................................................10 k½

Low Pass Filter Frequency (12 dB/oct.) (Variable) ................50 ~ 200 Hz

High Pass Filter Frequency (12 dB/oct.) (Variable)................50 ~ 200 Hz

Bass Boost Circuit (90 Hz) ................................................................6 dB

General

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

Current Consumption (1 kHz, 10 % THD) ........................................31 A

Dimensions (W ´ H ´ D) ...........................................261 ´ 57 ´ 256 mm

Weight................................................................................3.5 kg (7.7 lb)

Safety precautions

To prevent injury or fire, take the following

precautions:

• When extending the ignition, battery, or ground

• To prevent a short circuit, never put or leave any

• If the unit starts to emit smoke or strange smells,

• Do not touch the unit during use because the surface

To prevent damage to the machine, take the

following precautions:

• Be sure the unit is connected to a 12V DC power

• Do not open the top or bottom covers of the unit.

• Do not install the unit in a spot exposed to direct

• When replacing a fuse, only use a new one with the

• To prevent a short circuit when replacing a fuse, first

• If you experience problems during installation,

• If the unit does not seem to be working right, consult

FCC WARNING

This equipment may generate or use radio frequency

energy. Changes or modifications to this equipment

may cause harmful interference unless the

modifications are expressly approved in the instruction

manual. The user could lose the authority to operate

this equipment if an unauthorized change or

modification is made.

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.

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.)

4 Channel Mode ...................................................................100 W ´ 4

3 Channel Mode...............................................100 W ´ 2 + 300 W ´ 1

2 Channel Mode ...................................................................300 W ´ 2

4 Channel Mode (20 Hz ~ 20 kHz, less than 0.08 % THD).....50 W ´ 4

4 Channel Mode

3 Channel Mode (20 Hz ~ 20 kHz, 0.08 % THD) + (1 kHz, 0.8 % THD)

2 Channel Mode (1 kHz, 0.8 % THD)....................................150 W ´ 2

4 Channel Mode (1 kHz, 0.8 % THD)......................................75 W ´ 4

......................................................................(10-1/4´2-1/4´10-1/16 in.)

wires, make sure to use automotive-grade wires or

other wires with a 5mm

prevent wire deterioration and damage to the wire

coating.

metallic objects (such as coins or metal tools) inside

the unit.

turn off the power immediately and consult your

Kenwood dealer.

of the unit becomes hot and may cause burns if

touched.

supply with a negative ground connection.

sunlight or excessive heat or humidity. Also avoid

places with too much dust or the possibility of water

splashing.

prescribed rating. Using a fuse with the wrong rating

may cause your unit to malfunction.

disconnect the wiring harness.

consult your Kenwood dealer.

your Kenwood dealer.

...........................................................................50 W ´ 2 + 150 W ´ 1

2WARNING

2CAUTION

Cleaning the unit

NOTE

PROBLEM

..................................................................................

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

.....................................................................

(DIN45324, +B=14.4V) ................................50 W ´ 4

(AWG10) or more to

• Input (or output) cables are

• Protection circuit may be

• Volume is too high.

• The speaker cord is shorted.

• The speakers wire are

• A speaker wire is pinched by a

• The switches may be set

The input sensitivity adjusting

control is not set to the correct

position.

disconnected.

activated.

connected with wrong + / -

polarity.

screw in the car body.

improperly.

POSSIBLE CAUSE

• The rated input power of the speakers that are

• The impedance of the speakers that are going to

• If a buzzing noise is heard from the speakers

• Do not allow the wire to directly contact the edge

• Connect the ground wire to a metal part of the

• Be sure to attach a protective fuse into the

• Use vehicle-type (fire-resistant) power supply

• When more than one power amplifier are going

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.

be connected should be 2½ or greater (for

stereo connections), or 4½ 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.

Example: One Power Amplifier Is Used

when the engine is running, connect a line noise

filter (optional) to each of the battery wire.

of the iron plate by using Grommets.

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.

battery wire close to the battery. Use a

protective fuse having a capacity that is about 10

A higher than the maximum current drawn by the

amplifier.

wiring wire for the battery wire and the ground

wire. The current capacity of the power supply

wiring wire should be about 10 A higher than that

of the protective fuse capacity (which means

about 20 A higher than the maximum current

drawn by the amplifier).

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.

Maximum Current Drawn

Wiring

Speaker Selection

Cross-sectional Area of

KAC-849

Wiring Wire (AWG)

Protective Fuse

8 ½

• Connect the input (or output)

• Check connections by referring

• Replace the fuse and use lower

• After check the speaker cord and

• Connect them properly checking

• Connect the speaker wire again

• Set switches properly by

Adjust the control correctly

referring to "Controls".

cables.

to "Power indicator".

volume.

fixing the cause of the short,

replace the fuse.

the + / - of the terminals and

wires well.

so that it is not pinched by

anything.

referring to "System examples".

4½

25 A

KAC-749S

80 W ´ 4

80 W ´ 2 + 250 W ´ 1

250 W ´ 2

40 W ´ 4

40 W ´ 2 + 120 W ´ 1

120 W ´ 2

60 W ´ 4

5 Hz ~ 50 kHz

100 dB

0.2 V

5.0 V

10 k½

50 ~ 200 Hz

6 dB

KAC-749S

14.4 V

26 A

261 ´ 57 ´ 256 mm

(10-1/4´2-1/4´10-1/16 in.)

3.5 kg (7.7 lb)

SOLUTION

2 ½

5 mm

50 A ´ 1 [25 A ´ 2]

31 A / 26 A

greater ´ 1

4½

25 A

(AWG 10) or

4½

25 A

Installation procedure

1. Remove the ignition key and disconnect the

2. Set the unit according to the intended usage.

3. Connect the input and output cables of the

4. Connect the speaker wires.

5. Connect the power wire, power control wire

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

• If the fuse blows, check wires for shorts, then

• Check that no unconnected cables or connectors

• Connect the speaker wires to appropriate speaker

• After installation, check that the brake lamps,

• The genuine-accessory car stereo shall have a

• Do not connect the speaker output leads from

• Do not connect cables and leads to both RCA

• Connect the power control lead to a power

negative - terminal of the battery to prevent

short circuits.

units.

and grounding wire following this order.

setting of any switch.

replace the fuse with one of the same rating.

are touching the car body. Do not remove caps from

unconnected cables or connectors to prevent short

circuits.

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.

winkers, and wipers work properly.

maximum power output of no more than 40 W.

a power amplifier (Optional) to the speaker

level input terminals of this unit, for this may

cause malfunction or damage.

cable input jacks and the speaker level input

terminals simultaneously, for this may cause

malfunction or damage.

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.

2WARNING

2CAUTION

Speaker level input terminals ( ! )

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.

KAC-849

KAC-749S

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

Take the time to read through this instruction manual.

Familiarity with installation and operation procedures will help

you obtain the best performance from your new power amplifier.

For your records

Record the serial number, found on the back of the unit, in the spaces

designated on the warranty card, and in the space provided below.

Refer to the model and serial numbers whenever you call upon your

KENWOOD dealer for information or service on the product.

Model KAC-849/749S Serial number

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

• Install this unit in a location which allows heat to

• The surface temperature of the amplifier will

• When making a hole under a seat, inside the trunk,

• Do not install near the dashboard, rear tray, or air

• The installation to the vehicle should securely fasten

• After installing the unit, check to make sure that

Self-tapping screw

(ø4 ´ 16 mm)

Installation board, etc.

(thickness : 15 mm or more)

heat build-up occurs and the unit may be damaged.

easily dissipate. Once installed, do not place any

object on top of the unit.

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.

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.

bag safety parts.

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.

electrical equipment such as the brake lamps, turn

signal lamps and windshield wipers operate

normally.

2CAUTION

Accessories

Self-tapping screws

Speaker level input

(Power terminal)

Terminal cover

(ø4 ´ 16 mm)

Part name

cable

External

View

Number of

Items

Related parts for kac-749s

kac-749s Summary of contents

Page 1

... KAC-849 KAC-749S 4-CHANNEL POWER AMPLIFIER INSTRUCTION MANUAL Take the time to read through this instruction manual. Familiarity with installation and operation procedures will help you obtain the best performance from your new power amplifier. ...

Page 2

... Fuse 40 A ´ KAC-849 7 FILTER FREQUENCY control 30 A ´ KAC-749S NOTE If you can’t find the specified capacity fuse at your store etc., consult your Kenwood dealer. 2 Battery terminal 8 RCA cable ground lead terminal ...

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