Kenwood KAC-818 User Manual

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KAC-818

MONO POWER AMPLIFIER

INSTRUCTION MANUAL

Page 2

English

Safety precautions

To prevent injury or fire, take the following precautions:

• When extending the ignition, battery, or ground wires, make sure to use automotivegrade wires or other wires with a 5mm

(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.

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.

• 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)

Round terminal

(Medium)

Round terminal

(Small)

Terminal cover

(Power terminal)

Self-tapping screws

(ø4 ×16 mm)

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English

Installation procedure

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 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 (ø4 ×16 mm)

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 cables and sigma servo feed back cables.

6.Connect the power cable, power control cable and grounding cable 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.

• 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 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

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English

Controls

Operations of the following control and switches are required in accordance with the center unit and speakers connected with this unit.

MONO

POWER AMPLIFIER

25Hz

15Hz

INFRASONIC

OFF

INPUT

SENSITIVITY(V)

LPF

FREQUENCY(Hz)

GND

LINE IN

0.3

0.5 1 2

5 0.2

150

100 70

50 200

LEFT RIGHT

SPEAKER LEVEL INPUT

POWER IN

FUSE(20A)

BATT

GND

FUSE(20A)

P.CON(REMOTE)

SPEAKER OUTPUT

SERVO ΙΙ

∑

SERVO ΙΙ

∑

1 2 3

456

@7 8 9 0 !

FUSE (20 A ×2)

Battery terminal

Ground terminal

Power control (REMOTE) terminal

Speaker output terminals

As this unit accepts speakers with a minimum impedance of 2 ohms, connect speakers with 2-ohm or higher impedance to these terminals.

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

SIGMA SERVO FEED BACK terminals (See p.8)

Be sure to make proper connections to the SIGMA SERVO FEED BACK terminals. Incorrect connection may result in lack of sound output or other malfunctions.

INFRASONIC FILTER switch

Ultralow frequencies that cannot be reproduced even by a subwoofer speaker do not become sound but become unnecessary oscillations, which affect the sound by causing distortion, etc. Setting this switch to "15 Hz" or "25 Hz" cuts the frequencies below the respective frequency. This improves the reproduction performance of the speakers by eliminating unnecessary oscillations which will not become sound.

LOW PASS FILTER FREQUENCY control

This control adjusts the frequency band output from this unit.

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 genuineaccessory car stereo. Use the diagram on the right as a guide.

2CAUTION

0.3

0.2

0.5

(V)

(W)

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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

LINE IN terminal

Speaker level input terminals

NOTE

■

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.

■

The protection function is activated in the following situations:

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.

• A speaker cable may be short-circuited.

• A speaker output may be in contact with the ground.

• The temperature of the internal parts may be higher than 120°C (248°F).

• The sigma servo connection may be erroneous.

• The fuse of this unit may be blown.

• The unit may be malfunctioning and sending DC signal to the speaker output.

• The grounding cable of this unit may not be connected with a metallic part which is electrically connected with the negative terminal of the battery.

• The power control cable may not be connected to this unit.

• The grounding cable of the center unit (cassette receiver, CD receiver, etc.) may not be connected with a metallic part which is electrically connected with the negative terminal of the battery.

English

Power indicator

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• 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.

• Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, 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). With this connection, shock noise may be generated when the power of the genuineaccessory car stereo is switched ON/OFF.

2CAUTION

English

Connection

MONO

POWER AMPLIFIER

25Hz

15Hz

INFRASONIC

OFF

INPUT

SENSITIVITY(V)

LPF

FREQUENCY(Hz)

GND

LINE IN

0.3

0.5 1 2

50.2

150

100 70

50 200

LEFT RIGHT

SPEAKER LEVEL INPUT

- +

LEFT

SPEAKER LEVEL INPUT

MONO

POWER AMPLIFIER

25Hz

15Hz

INFRASONIC

OFF

INPUT

SENSITIVITY(V)

LPF

FREQUENCY(Hz)

GND

LINE IN

0.3

0.5 1 2

50.2

150

100 70

50 200

LEFT RIGHT

SPEAKER LEVEL INPUT

■

RCA cable connection

CENTER UNIT

(Cassette receiver,

CD receiver, etc.)

Power control cable (Commercially available part)

RCA cable (Commercially available part)

Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage.

2CAUTION

RCA cable ground terminal

When using an RCA cable with a ground lead attached, connect the ground lead to this terminal.

Do not use this terminal for power source grounding. This unit will be damaged if the power source grounding wire is connected to this terminal.

2CAUTION

Genuine-accessory

car stereo

■

Speaker level input connection

ACC

Battey

Left output (White)

Right output (Red)

Left input

Right input

Left input

Right input

Left output

Right output

Car fuse box

Lead terminal (Commercially available part)

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English

SPEAKER OUTPUT

SERVO ΙΙ

∑

SERVO ΙΙ

∑

POWER IN

FUSE(20A)

BATT

GND

FUSE(20A)

P.CON(REMOTE)

SPEAKER OUTPUT

SERVO ΙΙ

∑

SERVO ΙΙ

∑

- +

■

Power and Speakers cable connection

Terminal cover

Battery

Ground cable (Commercially available part)

Battery cable (Commercially available part)

Power control cable (Commercially available part)

Subwoofer

Distribute the speaker cables and sigma servo cables along the same paths.

Protective Fuse

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

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 cord 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.

Power terminal

Connect to their respective terminals the power control wire, 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.

2WARNING

Maximum Current Drawn

Protective Fuse

Cross-sectional Area of Wiring

Wire (AWG)

28 A

40 A ×1 [20 A ×2]

5 mm

(AWG 10) or

greater ×1

Example: One Power Amplifier Is Used

Round terminal (Large)

Round terminal (Small)

Round terminal (Medium)

50 A

25 A 25 A

25 A

Power control (REMOTE) lead terminal

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English

Sigma servo feed back

The sound reproduced through conventional amplifiers is distorted due to the counterelectromotive force produced in the oscillating system of the speaker. The counterelectromotive force is particularly high with the woofer which requires a large drive mass.The sigma servo connection reduces distortion caused by the counterelectromotive force by including the circuit up to the speaker terminals in the negative feedback loop. This makes it possible to drive speakers with more fidelity to the input signals and create a sharp bass sound image with few feeling of noise interference.

The speaker cables and sigma servo cables should be distributed along the same paths.

• The extension of the negative feedback loop to include the speaker terminals makes it necessary to connect the sigma servo terminals correctly. Incorrect connection may result in sound degradation or other malfunction. If sound is not reproduced normally, check the connection of the sigma servo terminals, etc.

• If the Sigma servo terminals are not connected, the sound may fluctuate or noise may occur. Be sure to connect the Sigma servo terminals correctly.

• When connecting speakers in a parallel configuration, use speakers with an impedance of 4 ohms or more. Connecting speakers with smaller impedance than 4 ohms will cause malfunction.

• The rated input of the speakers connected to this unit should be no less than the maximum output of the amplifier. Otherwise malfunction may result. Be specially careful in this when connecting speakers in a parallel configuration.

2CAUTION

NOTE

■

Basic sigma servo connection

■

Series connection

Make this cable as short as possible.

2CAUTION

■

Parallel connection (1)

The speaker cables connected to this unit should be thick enough to supply the current capacity of two speakers.

2CAUTION

This connection is possible only when the speakers are identical and the speaker cables are also of the same type and length.

2CAUTION

■

Simplified sigma servo connection

■

Parallel connection (2)

In case any of the connection examples above cannot be used or if the speakers cannot be connected to the speaker terminals, connect them to this unit as shown in the figure.

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English

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output (2 Ω)..................................................................................................400 W ×1

Rated Power Output

(4 Ω) ......................................................................................200 W ×1 (DIN45324, +B=14.4V)

(2 Ω) ..........................................................................................300 W ×1 (100 Hz, 0.8 % THD)

Frequency Response (+0, –1 dB) ............................................................................5 Hz ~ 200 Hz

Total Harmonic Distortion (Rated power)#..............................................................0.01 % (100 Hz)

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

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

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

Input Impedance ....................................................................................................................10 kΩ

Damping Factor..............................................................................More than 9900 (at ∑ connect)

Low Pass Filter Frequency (24 dB/oct.)........................................................50 ~ 200 Hz (variable)

Infrasonic Filter Frequency (24 dB/oct.)..........................................................................15 / 25 Hz

# Sensitivity = Mini. , Through LPF (30 kHz)

General

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

Current Consumption (4 Ω, 14.4 V, 10% THD) ........................................................................28 A

Dimensions (W ×H ×D)......................................................................................290 ×56 ×230 mm

Weight ..................................................................................................................................3.7 kg

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. (No sound from one side.)

The output level is too small (or too large).

The sound quality is bad. (The sound is distorted.)

• Input (or output) cables are disconnected.

• The connection of the sigma servo terminals is wrong.

• Protection circuit may be activated.

• The fuse 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 the connection referring to "Sigma servo feed back".

• Check connections by referring to "Power indicator".

• Replace the fuse with a new fuse and use a lower volume.

Adjust the control correctly referring to "Controls".

• Connect them properly checking the + / - of the terminals and cables well.

• Connect the speaker cable again so that it is not pinched by anything.

• Set switches properly by

referring to "Controls".