Kenwood kac819 User Manual

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Kenwood kac819 User Manual

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.

PROBLEM

POSSIBLE CAUSE

SOLUTION

No sound.

• Input (or output) cables are

• Connect the input (or output)

(No sound from one side.)

disconnected.

cables.

 

• Protection circuit may be

• Check connections by referring

 

activated.

to "Power indicator".

 

• The connection of the sigma

• Check the connection referring

 

servo terminals is wrong.

to "Sigma servo feed back".

(Blown fuse.)

• Volume is too high.

• Replace the fuse and use lower

 

 

volume.

 

• The speaker cord is shorted.

• After check the speaker cord and

 

 

fixing the cause of the short,

 

 

replace the fuse.

 

 

 

The output level is too

The input sensitivity adjusting

Adjust the control correctly

small (or too large).

control is not set to the correct

referring to "Controls".

 

position.

 

 

 

 

The sound quality is bad.

• The speakers wire are

• Connect them properly checking

(The sound is distorted.)

connected with wrong + / -

the + / - of the terminals and

 

polarity.

wires well.

 

• A speaker wire is pinched by a

• Connect the speaker wire again

 

screw in the car body.

so that it is not pinched by

 

 

anything.

 

• The switches may be set

• Set switches properly by

 

improperly.

referring to "Controls".

 

 

 

KAC-819

MONO POWER AMPLIFIER

INSTRUCTION MANUAL

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output (2 Ω) ................................................................................................

450 W × 1

Max Power Output (4 Ω) ................................................................................................

300 W × 1

Rated Power Output (4 Ω) ............................................

150 W × 1 (20 Hz ~ 200 Hz, 0.08 % THD)

Rated Power Output (4 Ω) ........................................................

150 W × 1 (DIN45324, +B=14.4V)

Rated Power Output (2 Ω) ............................................................

230 W × 1 (100 Hz, 0.8 % THD)

Frequency Response (+0, –3 dB) ............................................................................

5 Hz ~ 200 Hz

Sensitivity (MAX) ..............................................................................................

0.2 V (rated output)

Sensitivity (MIN) ..............................................................................................

5.0 V (rated output)

Signal to Noise Ratio ............................................................................................................

100 dB

Input Impedance ....................................................................................................................

10 kΩ

Damping Factor ..............................................................................

More than 2000 (at ∑ connect)

Low Pass Filter Frequency (18 dB/oct.) ........................................................

50 ~ 200 Hz (variable)

Infrasonic Filter Frequency (18 dB/oct.) ..........................................................................

15 / 25 Hz

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

6 / 12 dB

General

Operating Voltage ..............................................................................

14.4 V (11 ~ 16 V allowable)

Current Consumption (100 Hz, 10 % THD)..............................................................................

21 A

Dimensions (W × H × D) ..................................................................................

290 × 56 × 200 mm

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

11-7/16 × 2-3/16 × 7-14/16 inch

Weight......................................................................................................................

3.1 kg (6.8 lbs)

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-819 Serial number

© PRINTED IN USA B64-1964-00 (KM/EM)

Safety precautions

2WARNING

To prevent injury or fire, take the following precautions:

When extending the ignition, battery, or ground wires, make sure to use automotive-grade wires or other wires with a 5mm2 (AWG10) or more to prevent wire deterioration and damage to the wire coating.

To prevent a short circuit, never put or leave any metallic objects (such as 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.

2CAUTION

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 a short circuit when replacing a fuse, first disconnect the wiring harness.

NOTE

If you experience problems during installation, consult your Kenwood dealer.

If the unit does not seem to be working right, consult your Kenwood dealer.

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.

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.

2CAUTION

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.

Wiring

If a buzzing noise is heard from the speakers when the engine is running, connect a line noise filter (optional) to each of the battery wire.

Do not allow the wire to directly contact the edge of the iron plate by using Grommets.

Connect the ground wire 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 wire is not connected.

Be sure to attach a protective fuse into the 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.

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

When more than one power amplifier are going 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.

Example: One Power Amplifier Is Used

Maximum Current Drawn

21 A

 

Protective Fuse

40 A × 1 [20 A × 2]

Cross-sectional Area of

5 mm2 (AWG 10) or

Wiring Wire (AWG)

greater

× 1

20 A

20 A

20 A

 

20A

Speaker Selection

The rated input power of the speakers that are 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.

Use speakers that have an impedance of 2Ω or greater. 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.

 

4Ω

 

4Ω 4Ω

 

4Ω

8 Ω

2 Ω

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 center unit and this unit according to the required application.

5.Connect the speaker wires and sigma servo feed back wires.

6.Connect the power wire, power control wire and grounding wire following this order.

7.Install the unit in the car.

8.Connect the negative - terminal of the battery.

9.Turn power ON and ensure that sound is output normally.

2WARNING

To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery’s positive terminal.

2CAUTION

If sound is not output normally, immediately turn power off and check connections. Be sure to perform the sigma servo connection correctly.

Be sure to make correct connections of the sigma servo terminals.

Be sure to turn the power off before changing the setting of any switch.

If the fuse blows, check wires 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 wires to appropriate speaker 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.

After installation, check that the brake lamps, winkers, and wipers work properly.

Power terminal (23)

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.

Accessories

Part name

External

Number of

View

Items

 

Terminal cover

 

1

(Power terminal)

 

 

 

Self-tapping screws

 

4

(ø4 × 16 mm)

 

 

 

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.

2CAUTION

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.

Self-tapping screw (ø4 × 16 mm)

Installation board, etc. (thickness : 15 mm or more)

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