Kenwood KAC-728, KAC-628, KAC-528 User Manual

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Page 1

KAC-728 KAC-628 KAC-528

POWER AMPLIFIER

INSTRUCTION MANUAL

B64-1360-00 (EM)

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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 5 mm

(AWG10) 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

Safety precautions

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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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.

■

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 activates in the following situations:

• When a speaker cable may be short-circuited.

• 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

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

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Controls

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

FUSE(15A)

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

LPF

FILTER

OFF

MONO(Lch)

STEREO

OPERATION

GND

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

LINE IN

LEFT RIGHT

SPEAKER LEVEL INPUT

FUSE(25A)

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

LPF

FILTER

HPF

MONO(Lch)

STEREO

OFF

L+R

OPERATION

GND

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

LINE IN

LEFT RIGHT

SPEAKER LEVEL INPUT

LPF

FILTER

OFF

MONO(Lch)

STEREO

OPERATION

GND

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

LINE IN

LEFT RIGHT

SPEAKER LEVEL INPUT

FUSE(20A x 2)

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

!0987

0987

5432

1 65432

KAC-628

KAC-528

KAC-728

KAC-628

KAC-528

KAC-728

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RCA cable ground lead terminal

FILTER switch

These switches allow filtering of the speaker output signals.

• HPF (High Pass Filter) position (KAC-628 only)

Only frequencies of 150 Hz or higher are output. (Frequencies below 150 Hz are cut.)

• LPF (Low Pass Filter) position

Only frequencies of 80 Hz or lower are output. (Frequencies above 80 Hz 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.

OPERATION switch

This switch allows selection of the amplification method of input signals.

• STEREO position

The amplifier can be used as a stereo amplifier.

• L+R position (KAC-628 only)

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.

LINE IN terminal

Speaker level input terminals

Fuse (20 A ×2 : KAC-728)

Fuse (25 A ×1 : KAC-628) Fuse (15 A ×1 : KAC-528)

Battery terminal

Ground terminal

Power control (REMOTE) terminal

SPEAKER 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 2Ω or greater. When multiple speakers are to be connected, ensure that the combined impedance is 2Ω or greater for each channel.

• Bridged Connections:

When you wish to use the unit as a highoutput 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 4Ω or greater. When multiple speakers are to be connected, ensure that the combined impedance is 4Ω or greater.

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

2CAUTION

NOTE

MAXMIN

0.30.5

1.0

(W)

LPF

FILTER

OFF

KAC-728/528

LPF

FILTER

HPF

OFF

KAC-628

MONO(Lch)

STEREO

OPERATION

KAC-728/528

MONO(Lch)

STEREO

L+R

OPERATION

KAC-628

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LPF

FILTER

OFF

MONO(Lch)

STEREO

OPERATION

GND

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

LINE IN

LEFT RIGHT

SPEAKER LEVEL INPUT

LPF

FILTER

OFF

MONO(Lch)

STEREO

OPERATION

GND

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

L R

LINE IN

LEFT RIGHT

SPEAKER LEVEL INPUT

■

RCA cable connection

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

CENTER UNIT

(Cassette receiver,

CD receiver, etc.)

RCA cable (Commercially available part)

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

Left output (White)

Right output (Red)

Left input

Right input

• 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.

• 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 genuine-accessory car stereo is switched ON/OFF.

2CAUTION

Genuine-accessory

car stereo

■

Speaker level input connection

Connect the unit by inserting it in the connection between the genuine-accessory car stereo and speakers.

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

Left output

Right output

Lead terminal (Commercially available parts)

Left input

Right input

Connection

RCA cable ground terminal

To Power control (REMOTE) terminal

Battery

Page 7

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

BRIDGED

■

Speakers cable connection

(Stereo Connections)

Left speaker

Right speaker

(Bridged Connections)

Lead terminal (Commercially available parts)

Left output

Right output

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

BRIDGED

Lead terminal (Commercially available parts)

Examples:

■

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.

• The impedance of the speakers that are going to be connected should be 2Ω or greater (for stereo connections), or 4Ω 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.

Model Stereo Connections (4Ω) Bridged Connections (4Ω)

KAC-728 200 W or greater 600 W or greater KAC-628 100 W or greater 300 W or greater KAC-528 70 W or greater 200 W or greater

200W (4Ω)

4 Ω

200W (4Ω)

4 Ω

200W (2Ω)

100W (8Ω)

200W (2Ω)

Maximum output of the amplifier

Combined impedance

Rated input power and impedance of the speakers

Page 8

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

■

Power cable connection

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

2WARNING

Terminal cover

Battery

Ground cable (Commercially available parts)

Battery cable (Commercially available parts)

Protective Fuse

Power control cable (Commercially available parts)

Power terminal

Connect to their respective terminals the power control cable, power supply cable, and ground cable, all of which pass through the associated terminal cover. Once the connections are complete, place the cover on the terminal section.

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 cable.

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

• Connect the ground cable 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 cable is not connected.

• Be sure to attach a protective fuse into the battery cable 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 cable for the battery cable and the ground cable. The current capacity of the power supply wiring cable 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 cable and protective fuse of greater current-handling capacity than the total maximum current drawn by each amplifier.

Connection

CENTER UNIT

ACC

Round terminal (Large)

Round terminal (Small)

Power terminal

Round terminal (Medium)

Car fuse box

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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 (ø4 × 16 mm)

CA-2SL CA-12SL CA-22SL CA-52SLRCA cable

CA-3WL CA-13WL CA-23WL CA-53WLRCA cable (ø7mm)

CA-5W

CA-15W

CA-25W

CA-45W

CA-65W

RCA cable (ø12mm)

0.5m 1m 2m 4m 5m 6m

Type

Length

Model

KAC-728 KAC-628 KAC-528

Maximum Current

Drawn

28 A 19 A 16 A

Protective Fuse

50 A × 1 [25 A × 2]

30 A × 1 25 A × 1

Cross-sectional Area of Wiring

Cable (AWG)

5 mm2(AWG 10) or greater × 1 3 mm2(AWG 12) or greater × 1 3 mm2(AWG 12) or greater × 1

Example: One Power Amplifier Is Used

50 A 25 A 25 A

25 A

Page 10

System examples

●

Principle of Tri-mode

Method of frequency band division using a coil and capacitor•••in case of 6dB/oct. slope

0 dB

-3 dB

Coil (L):

Passes low frequencies and blocks high

frequencies. (Low pass)

Capacitor (C):

Passes high frequencies and blocks low

frequencies. (High pass)

Crossover Frequency

Frequency

159000

C= (µF)

fc x R

159 x R

L= (mH)

fc=Cut of Frequency (Hz) R=Speaker Impedance (Ω)

●

Example:

When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms.

Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the formula above. The capacitor rating should be as close as possible to 331.25 (µF) and the coil rating should be as close as possible to 5.3 (mH).

• If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit.

• Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in a drop of the combined impedance with the subwoofer.

• Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient.

2CAUTION

LRL

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-728/528

KAC-628

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-728/528

KAC-628

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-728/528

KAC-628

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

MONO(Lch)

STEREO

OPERATION

MONO(Lch)

STEREO

L+R

OPERATION

KAC-728/528

KAC-628

LPF

FILTER

OFF

LPF

FILTER

HPF

OFF

CENTER UNIT

High pass

Subwoofer (L + R) (Bridged)

■

Full-range 2-channel system

■

Full-range 2-channel + Subwoofer system

■

Tri-mode

■

High-power full-range 2-channel system

Switch setting

Right speaker

Left speaker

Right speaker (Bridged)

Left speaker (Bridged)

Right speaker

Left speaker

Subwoofer (L + R) (Bridged)

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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.

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.

• 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 connections by referring to "Protection function".

• 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 "System examples".

Page 12

Specifications

Specifications subject to change without notice.

Audio Section ..............................................KAC-728 KAC-628 KAC-528

Max Power Output (4 Ω)

Normal..............................................................200 W × 2 100 W × 2 70 W × 2

Bridge ..............................................................600 W × 1 300 W × 1 200 W × 1

Rated Power Output (4 Ω)

Normal (DIN45324, +B=14.4 V) ......................100 W × 2 50 W × 2 35 W × 2

Bridge (1 kHz, 0.8 % THD) ..............................300 W × 1 150 W × 1 100 W × 1

Rated Power Output (2 Ω)

Normal (1 kHz, 0.8 % THD) ..............................150 W × 2 75 W × 2 50 W × 2

Frequency Response (+0, –1 dB) ........................5 Hz ~ 50 kHz 10 Hz ~ 45 kHz 5 Hz ~ 50 kHz

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

Sensitivity (MAX) (rated output) ..........................0.2 V 0.15 V 0.2 V

Sensitivity (MIN) (rated output) ............................5.0 V 4.0 V 5.0 V

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

Low Pass Filter (12 dB/oct.) ................................80 Hz 80 Hz 80 Hz

High Pass Filter (12 dB/oct.) ................................ 150 Hz

General..........................................................KAC-728 KAC-628 KAC-528

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

Current Consumption (1 kHz, 10% THD) ............28 A 19 A 16 A

Dimensions (W × H × D)[mm] ..............................220 × 56.1 × 300 220 ×56.1 × 228 220 × 55 × 160

Weight..................................................................3.6 kg 2.7 kg 1.8 kg

Kenwood KAC-728, KAC-628, KAC-528 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety precautions

Protection function

Installation procedure

Controls

RCA cable connection

Speaker level input connection

Connection

Speakers cable connection

Speaker Selection

Power cable connection

Installation

System examples

Troubleshooting Guide

Specifications