KAC-726
KAC-526X
POWER AMPLIFIER
INSTRUCTION MANUAL
© B64-1213-00 (EM)
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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.
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.)
Length
0.5m
1m
2m
4m
5m
6m
Type
RCA cable
RCA cable (ø7mm)
RCA cable (ø12mm)
CA-2SL
CA-12SL CA-22SL
CA-52SL
CA-53WL
CA-3WL CA-13WL CA-23WL
CA-5W CA-15W CA-25W
CA-45W
CA-65W
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
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Controls
Operations of the follow ing control and sw itches are required in accordance w ith
the center unit and speakers connected w ith this unit.
SPEAKER LEVEL INPUT
LEFT
RIGHT
OPERATION
STEREO MONO(Lch)
FILTER
OFF LPF
LINE IN
L
R
0.5 0.3
1.0
GND
MIN
INPUT
SENSITIVITY(V)
MAX
KAC-7 2 6
KAC-5 2 6 X
1
2
3 4
5
6
POWER IN
GND
BRIDGED
LEFT
FUSE(20A x 2)
BATT
P.CON(REMOTE)
RIGHT
SPEAKER OUTPUT
POWER AMPLIFIER
KAC-7 2 6
7
8 9 0
!
POWER IN
BRIDGED
LEFT
GND
P.CON(REMOTE)
RIGHT
SPEAKER OUTPUT
FUSE(15A)
BATT
POWER AMPLIFIER
KAC-5 2 6 X
7 8 9 0
!
1 RCA c a b le g ro u n d le a d t e rm in a l
2 FILTER s w it c 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.
3 OP ERATION s w it c h
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.)
10
4 INP UT S ENS ITIVITY c o n t ro l
0.5 0.3
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.
15
1.0
MIN
MAX
25
(W)
4
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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 t e rm in a l
6 S p e a k e r le ve l in p u t t e rm in a ls
7 Fu s e (2 0 A × 2 : KAC-7 2 6 )
Fu s e (1 5 A : KAC-5 2 6 X)
8 Ba t t e ry t e rm in a l
9 Gro u n d t e rm in a l
0 P o w e r c o n t ro l (REMOTE) t e rm in a l
! S P EAKER OUTP UT t e rm in a ls
Protection function
This unit is equipped w ith a protection function for protecting this unit and your
speakers from various accidents or problem s that can occur.
When the protection function is triggered, the Pow er indicator goes off and the
am plifier stops operating.
■ P o w e r in d ic a t o r:
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.
Power indicator
■ Th e p ro t e c t io n fu n c t io n a c t iva t e s in t h e fo llo w in g
s it u a t io n s :
• 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.
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Connection
■RCA c a b le c o n n e c t io n
2CAUTION
Left output (White)
Right output (Red)
CENTER UNIT
(Cassette receiver,
CD receiver, etc.)
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.
RCA cable (Commercially
available part)
Power control cable
Right input
Left input
SPEAKER LEVEL INPUT
LEFT
RIGHT
OPERATION
STEREO MONO(Lch)
FILTER
OFF
LPF
LINE IN
R
0.5 0.3
1.0
GND
MIN
INPUT
SENSITIVITY(V)
MAX
RCA cable ground term inal
2CAUTION
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.
■S p e a k e r le ve l in p u t c o n n e c t io n
Connect the unit by inserting it in the connection between the genuine-accessory car stereo and
speakers.
Left output
Genuine-accessory
car stereo
ACC
Right output
Speaker level input term inals
Lead terminal
(Commercially
available parts)
+
-
Battey
Right input
Left input
SPEAKER LEVEINPU
LEFT RIGHT
OPERATION
STEREO MONO(Lch)
FILTER
OFF
LPF
LINE IN
L
R
0.5 0.3
1.0
GND
MIN
INPUT
SENSITIVITY(V)
MAX
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.
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■P o w e r a n d S p e a k e rs c a b le c o n n e c t io n
Power control
(REMOTE) lead terminal
POWER IN
GND
BRIDGED
LEFT
BATT
P.CON(REMOTE)
RIGHT
SPEAKER OUTPUT
Right
speaker
Terminal cover
Power control cable
Battery cable (Yellow)
Left
speaker
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.
Round terminal (Large)
Fire wall
Grommets
+
-
Battery
2WARNING
NOTE
To prevent fire caused by a short in the wiring, connect a
fusible link or breaker nearby the battery’s positive terminal.
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.
Pow er term inal
Pass battery and ground cables through supplied
terminal cover and connect to respective
terminals. After completing connections, fasten
terminal cover over terminal bracket.
Speaker output cable term inal
Connect the speaker output
cables to these terminals.
Round terminal (Medium)
Round terminal (Small)
Lead terminal
(Commercially
available part)
Speaker output
cable
(Brid g e d )
2CAUTION
POWER IN
GND
BRIDGED
LEFT
BATT
P.CON(REMOTE)
RIGHT
If you wish to bridge-connect a speaker,
the speaker impedance must be no less
than 4 ohms.
SPEAKER OUTPUT
Connecting a speaker with an impedance
lower than 4 ohms may damage the unit.
exam ples:
L
L
Bridged
R
R
≥4Ω
≥8Ω ≥8Ω
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System exam ples
■ Fu ll-ra n g e 2 -c h a n n e l s ys t e m
Sw itch setting
Left speaker
Right speaker
OPERATION
FILTER
MONO(Lch)
OFF LPF STEREO
L
L
CENTER UNIT
R
R
■ Hig h -p o w e r fu ll-ra n g e 2 -c h a n n e l s ys t e m
Sw itch setting
L
L
L
Left speaker (Bridged)
Right speaker (Bridged)
OPERATION
FILTER
MONO(Lch)
OFF LPF STEREO
R
R
CENTER UNIT
L
L
R
R
R
■ Fu ll-ra n g e 2 -c h a n n e l + S u b w o o fe r s ys t e m
Sw itch setting
Left speaker
Right speaker
OPERATION
FILTER
MONO(Lch)
OFF LPF STEREO
CENTER UNIT
L
L
Subwoofer
(L + R)
(Bridged)
R
R
■ Tri-m o d e
L
Sw itch setting
C
C
Subwoofer
(L + R)
(Bridged)
OPERATION
FILTER
MONO(Lch)
OFF LPF STEREO
High
pass
L
L
CENTER UNIT
R
R
●P rin c ip le o f Tri-m o d e
Method of frequency band division using a coil and capacitor•••in case of 6dB/ oct. slope
Coil (L): Passes low frequencies and blocks high
Crossover Frequency
frequencies. (Low pass)
0 dB
-3 dB
Capacitor (C): Passes high frequencies and blocks low
frequencies. (High pass)
159000
L
C
C=
L=
(µF)
fc=Cut of Frequency (Hz)
fc x R
159 x R
fc
R=Speaker Impedance (Ω)
Frequency
(mH)
●Exa m p le :
When it is required to set a crossover frequency of 120 Hz using speakers w ith an
im pedance of 4 ohm s.
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.
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Troubleshooting Guide
Wh a t m ig h t a p p e a r t o b e a m a lfu n c t io n in yo u r u n it m a y ju s t b e t h e re s u lt
o f s lig h t m is o p e ra t io n o r m is w irin g . Be fo re c a llin g s e rvic e , firs t c h e c k t h e
fo llo w in g t a b le fo r p o s s ib le p ro b le m s .
P ROBLEM
P OS S IBLE CAUS E
S OLUTION
No sound.
(No sound from one side.)
• Input (or output) cables are
disconnected.
• Connect the input (or output)
cables.
• Protection circuit may be
activated.
• The fuse may be blown
because the volume was too
high.
• Check connections by referring
to "Protection function".
• Replace the fuse with a new
fuse and use a lower volume.
The output level is too
sm all (or too large).
The input sensitivity adjusting
control is not set to the correct
position.
Adjust the control correctly
referring to “Controls”.
The sound quality is bad.
(The sound is distorted.)
• The speakers cable are
connected with wrong + / -
polarity.
• Connect them properly checking
the + / - of the terminals and
cables well.
• A speaker cable is pinched by a • Connect the speaker cable again
screw in the car body.
so that it is not pinched by
anything.
• The switches may be set
improperly.
• Set switches properly by
referring to "System examples".
Specifications
S p e c ific a t io n s s u b je c t t o c h a n g e w it h o u t n o t ic e .
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
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