KENWOOD KAC-726, KAC-526X User Manual

KAC-726
KAC-526X

POWER AMPLIFIER

INSTRUCTION MANUAL

© B64-1213-00 (EM)

Safet y precautions

2WARNING

Take the following precautions to
prevent fire and avoid personal
injury :

• When extending the battery cable, or
ground cable, use 5mm2(AWG10) or
larger automotive grade cable to avoid
cable deterioration or damage to the
covering.

• Check that no metal objects (coins, tools,
etc.) are left inside the unit to avoid short
circuits.

• If you smell or see smoke, turn the
power off 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

Take the following precautions to
keep the unit in proper working
order.

• Be sure the unit is connected to a 12V
DC power supply with a negative ground
connection.

• Do not open the top or bottom cover.

• Do not install the unit in places it is
exposed to direct sunlight, high heat or
humidity, water may splash over it, or
dust exists.

NOTE

If you have difficulty in installing this unit
in your vehicle, contact your Kenwood
dealer.

Cleaning the unit

If the surface is dirty, wipe it clean with a
silicon cloth or soft dry cloth with the
power off.

2CAUTION

Do not use hard cloths or paint thinner,
alcohol, or other volatile solvents. These
may damage external surfaces or remove
indicator characters.

Accessories

Part name

Battery cable

(Yellow) (6 m)

Ground cable (Black)

(1 m)

Self-tapping screws

(ø4 × 16 mm)

Terminal cover

(Power terminal)

2

External

View

Number
of Items

1

1

4

1

Part name

Round terminal

(Large)

Round terminal

(Medium)

Round terminal

(Small)

Grommets 1

External

View

Number
of Items

1

2

1

Inst allation 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.

2CAUTION

• 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.

Installation

Self-tapping screw
(ø4 × 16 mm)

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

• 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.)

Type

Length

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

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-65WRCA cable (ø12mm)

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.

• After installing the unit, check to make sure that electrical equipment such as the brake lamps,
turn signal lamps and windshield wipers operate normally.

• Install the unit securely in a location that does not interfere with driving.

3

Controls

24 61 53

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

79 !08

FUSE(20A x 2)

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

79 !08

FUSE(15A)

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

POWER AMPLIFIER

MAXMIN

0.30.5

1.0

(W)

25

15

10

Operations of the following control and switches are required in accordance w ith
the center unit and speakers connected wit h this unit.

KAC-726
KAC-526X

KAC-726

KAC-526X

1

RCA cable ground lea d terminal

2

FILTER sw i tc h

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.

OPERAT ION switch

3

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.)

4

INPUT SENSITIVI TY 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.

4

NOTE

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

5

LINE IN term inal

6

Speaker lev el input terminals

7

Fuse (20 A ×2 : KAC-726)

Fuse (15 A : KAC-526X )

8

Battery termi nal

9

Ground terminal

0

Power control (REM O TE) termi nal

!

SPEAKER OUTPUT termi nals

Prot ection 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 indica tor:

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 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

5

Connection

■

RCA cable connectio n

2CAUTION

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.

Left output (White)

Right output (Red)

RCA cable (Commercially
available part)

CENTER UNIT

(Cassette receiver,

CD receiver, etc.)

Power control cable

Left input

OPERATION

FILTER

MONO(Lch)

STEREO

LPF

OFF

1.0

GND

SENSITIVITY(V)

LINE IN

L

0.30.5

MAXMIN

INPUT

RCA cable ground terminal

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

R

Right input

SPEAKER LEVEL INPUT

LEFT RIGHT

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.

■

Speaker lev el input connection

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

Left output

Right output

Genuine-accessory

car stereo

ACC

Speaker level input terminals

Lead terminal
(Commercially
available parts)

FILTER

LPF

OFF

STEREO

OPERATION

GND

MONO(Lch)

1.0

SENSITIVITY(V)

0.30.5

INPUT

MAXMIN

Left input

LINE IN

L R

SPEAKER LEVEL INPUT

LEFT RIGHT

Right input

- +

Battey

2CAUTION

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

6

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

- +

■

POWER IN

BATT P.CON(REMOTE)

GND

LEFT

BRIDGED

RIGHT

SPEAKER OUTPUT

Power and Spea kers cable connection

Power control
(REMOTE) lead terminal

Terminal cover

Power control cable

Battery cable (Yellow)

Ground cable (Black)

• 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.

Fire wall

Round terminal (Large)

Grommets

Battery

NOTE

Connect the ground cable to a metal
part of the car chassis that acts as an

2WARNING

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

electrical ground passing electricity to
the battery‘s negative - terminal. Do
not turn the power on if the ground
cable is not connected.

Speaker output cable terminal

Connect the speaker output

Power terminal

Pass battery and ground cables through supplied
terminal cover and connect to respective
terminals. After completing connections, fasten
terminal cover over terminal bracket.

cables to these terminals.

Lead terminal
(Commercially
available part)

Speaker output
cable

Right
speaker

Left
speaker

Round terminal (Medium)

Round terminal (Small)

(Bridged)

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.

examples:

L

R

≥4Ω

L

R

≥8Ω ≥8Ω

Bridged

7

Syst em examples

L

C

■

Full-range 2-channel sy stem

Switch setting

FILTER

■

High-power full-range 2-c hannel system

FILTER

■

Full-range 2-channel + Subwoofer system

FILTER

OPERATION

MONO(Lch)

STEREO

LPFOFF

Switch setting

OPERATION

MONO(Lch)

STEREO

LPFOFF

Switch setting

OPERATION

MONO(Lch)

STEREO

LPFOFF

CENTER UNIT

L

CENTER UNIT

R

CENTER UNIT

LRL

L

R

LRL

Left speaker

R

L

R

R

Right speaker

Left speaker (Bridged)

Right speaker (Bridged)

Left speaker

Right speaker

LRL

R

Subwoofer
(L + R)
(Bridged)

■

Tri-mode

Switch setting

FILTER

●

OPERATION

MONO(Lch)

STEREO

LPFOFF

Pr incip le of Tri-m ode

CENTER UNIT

LRL

C

High

R

pass

C

L

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

0 dB

-3 dB

Example:

●

Crossover Frequency

Frequency

Coil (L):

Capacitor (C):

C= (µF)

L= (mH)

Passes low frequencies and blocks high

frequencies. (Low pass)

Passes high frequencies and blocks low

frequencies. (High pass)

159000

fc x R

159 x R

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

fc

When it is required to set a crossover frequency of 120 Hz using speakers wit h 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).

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.

8

Subwoofer
(L + R)
(Bridged)

Troubleshooting Guide

What might appear to be a malfunction in your unit may just be the result
of slight misoperati on or miswiring. Before calling service, first ch eck the
following table for possible problems.

PROBLEM POSSIBLE CAUSE SOLUTION

No sound.
(No sound from one side.)

• Input (or output) cables are
disconnected.

• Protection circuit may be
activated.

• The fuse may be blown
because the volume was too
high.

• 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.

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

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

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.

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".

Specifications

Specificatio ns sub j ect to change w i thout notice.

Audio Section KAC-726 KAC-526X

Max Power Output (4 Ω)

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

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

Rated Power Output (4 Ω)

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

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

Rated Power Output (2 Ω)

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

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

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

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

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

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

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

General KAC-726 KAC-526X

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

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

Dimensions (W × H × D)....................................220 × 52 × 300 mm 220 × 52 × 160 mm

Weight ....................................................................................3.0 kg 1.6 kg

9

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