Kenwood Stereo Amplifier 526 User Manual

KAC-726  
KAC-526X  
POWER AMPLIFIER  
INSTRUCTION MANUAL  
© B64-1213-00 (EM)  
 
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
 
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
 
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.  
5
 
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.  
6
 
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  
88Ω  
7
 
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 ()  
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.  
8
 
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 )  
Normal ..........................................................................200 W × 2 70 W × 2  
Bridge............................................................................600 W × 1 200 W × 1  
Rated Power Output (4 )  
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 )  
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 k10 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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