Kenwood KAC-5202 User Manual

8 Ω

2 Ω

4Ω

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.)

(Blown fuse.)

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

• Input (or output) cables are disconnected.

• Protection circuit may be activated.

• Volume is too high.

• The speaker cord is shorted.

The input sensitivity adjusting control is not set to the correct position.

• Connect the input (or output) cables.

• Check connections by referring to <Protection function>.

• Replace the fuse and use lower volume.

• After check the speaker cord and fixing the cause of the short, replace the fuse.

Adjust the control correctly referring to <Controls>.

KAC-5202

STEREO/BRIDGEABLE POWER AMPLIFIER

INSTRUCTION MANUAL

立體聲/橋路放大器

使用說明書

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

• The speakers wire are

connected with wrong + / polarity.

• A speaker wire is pinched by a screw in the car body.

• The switches may be set improperly.

• Connect them properly checking

the + / - of the terminals and wires well.

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

• Set switches properly by referring to <System examples>.

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output ..............................................................................................................................................250 W

Rated Power Output (4 Ω)

Normal (20 Hz – 20 kHz, 0.08% THD) ..........................................................................................................40 W × 2

Bridge (1kHz, 0.8% THD) ...........................................................................................................................120 W × 1

Rated Power Output (2 Ω)

Normal (1 kHz, 0,8 % THD) ..........................................................................................................................60 W × 2

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

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

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

Sen sib ilid (MIN) (rated output) ..............................................................................................................................5.0 V

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

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

General

Operating Voltage (11 – 16 0V allowable) ............................................................................................................14.4 V

Current Consumption ............................................................................................................................................16 A

Dimensions (W × H × D) .................................................................................................................250 × 52 × 160 mm

.....................................................................................................................(9-13/16 × 2-1/16 × 6-5/16 inch)

Weight ....................................................................................................................................................2.1 kg (4.6 lbs)

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 3mm2(AWG12) 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.

■ 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 install a protective fuse in the power cord near the battery. The protective fuse should be the same capacity as the unit’s fuse capacity or somewhat larger.

• For the power cord and ground, use a vehicle type (fireproof) power wring cord with a current capacity greater than the unit’s fuse capacity. (Use a power wiring cord with a diameter of 3 mm2(AWG 12) or greater.)

• 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.

■ 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.

Combined impedance

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 wires.

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

6. Install the unit in the car.

7. Connect the negative - terminal of the battery.

2WARNING

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

2CAUTION

• 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.

■ Speaker level input terminals (!)

• The genuine-accessory car stereo shall have a maximum power output of no more than 40 W.

• Do not connect the speaker output leads from a power amplifier (Optional) to the speaker level 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 level 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 genuine-accessory car stereo is switched ON/OFF.

■ 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.

■ Accessories

Part name

Terminal cover

(Power terminal)

Self-tapping screws

(ø4 × 16 mm)

External

View

Number of

Items

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)

LRL

MONO(Lch)

STEREO

OPERATION

LPF

FILTER

OFF

LRL

MONO(Lch)

STEREO

OPERATION

LPF

FILTER

OFF

MONO(Lch)

STEREO

OPERATION

LPF

FILTER

OFF

432

Controls

INPUT

SENSITIVITY(V)

MAXMIN

0.30.5

1.0

(W)

250 mm 237 mm

160 mm

125 mm

Ø4.6

089 !6

1 234 5

GND

LEFT

GED

RIGHT

LEFT

BRIDG

RIGHT

SPEAKER LEVEL INPUT

25W or greater

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

1 Fuse

15 A × 1

2 Battery terminal 3 Ground terminal 4 Power control (REMOTE) terminal 5 SPEAKER OUTPUT terminals

• Stereo Connections:

When you wish to use the unit as a stereo amplifier, stereo connections are used.

• Bridged Connections:

When you wish to use the unit as a high-output monaural amplifier, bridged connections are used. (Make connections to the LEFT channel (+) and the RIGHT channel (–) SPEAKER OUTPUT terminals.)

System examples

■ 2-channel system

CENTER

UNIT

Left speaker Right speaker

6 RCA cable ground lead terminal

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

2CAUTION

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.

7 FILTER switch

These switches allow filtering of the speaker output signals.

• 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.

Connection

NOTE

■ RCA cable connection ■ Speaker level input connection

For safe installation, read <Installation procedure> before starting work.

CENTER UNIT (CD receiver, etc.)

8 OPERATION switch

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

• STEREO position

The amplifier can be used as a stereo amplifier.

• 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.)

9 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.

NOTE

For the pre-output level or the maximum power output, refer to the <Specifications> in the instruction manual of the center unit.

0 LINE IN terminal ! Speaker level input terminals

Genuine-accessory car stereo

(No line output center unit etc.)

RCA cable*

Car fuse box

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.

■ The protection function is activated in the following situations:

• When a speaker wire 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 internal temperature is high and unit

won’t operate.

• When a ground wire 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.

*Commercially available parts

Right speaker

Left speaker

■ Subwoofer system

CENTER

UNIT

■ High-power 2-channel system

CENTER

UNIT

■ Tri-mode

High pass

CENTER

UNIT

LRL

Left speaker Right speaker

Subwoofer (Bridged)

Left speaker (Bridged)

Right speaker (Bridged)

Subwoofer (L + R)

0 dB

-3 dB

Battery

Power control wire*

■ Speaker stereo connection ■ Speaker bridge connection

Lead terminal*

Crossover Frequency

Left speaker

Right speaker

Lead terminal*

■ Power wire connection

ACC

Speaker (Bridged)

Frequency

Battery wire*

Protective Fuse*

Battery

FILTER

LPF

OFF

Principle of Tri-mode

Method of frequency band division using a coil and capacitor ... in case of 6dB/oct. slope Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. (High pass)

Example:

When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. fc=Cut of Frequency (Hz) R=Speaker Impedance (Ω)

OPERATION

MONO(Lch)

STEREO

159000

C= (µF)

fc x R

159 x R

L= (mH)

159000

= = 331.25 µF

120Hz x 4Ω

159 x 4Ω

= = 5.3 mH

120Hz

2CAUTION

• 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.

Lead terminal*

Terminal cover

Power control wire*

Ground wire*