Kenwood KAC 628 User Manual

KAC-728  
KAC-628  
KAC-528  
POWER AMPLIFIER  
INSTRUCTION MANUAL  
B64-1360-00 (EM)  
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.  
Power indicator  
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.  
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.  
3
Controls  
Operations of the following control and switches are required in accordance with the center  
unit and speakers connected with this unit.  
SPEAKER LEVEL INPUT  
LEFT  
RIGHT  
OPERATION  
STEREO MONO(Lch)  
FILTER  
OFF LPF  
LINE IN  
L
R
0.5 0.3  
KAC-728  
1.0  
GND  
MIN  
INPUT  
SENSITIVITY(V)  
MAX  
1
2
3 4  
5
6
SPEAKER LEVEL INPUT  
LEFT RIGHT  
OPERATION  
FILTER  
OFF  
L+R  
LINE IN  
HPF  
LPF  
STEREO MONO(Lch)  
L
R
0.5 0.3  
1.0  
KAC-628  
KAC-528  
GND  
MIN  
INPUT  
SENSITIVITY(V)  
MAX  
1
2
3 4  
5
6
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  
1
2
3 4  
5
6
POWER IN  
GND  
BRIDGED  
LEFT  
FUSE(20A  
x
2)  
BATT  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
KAC-728  
KAC-628  
POWER AMPLIFIER  
7
8 9 0  
!
POWER IN  
BRIDGED  
LEFT  
GND  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
FUSE(25A)  
BATT  
POWER AMPLIFIER  
7
8 9 0  
!
POWER IN  
BRIDGED  
LEFT  
GND  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
FUSE(15A)  
BATT  
KAC-528  
POWER AMPLIFIER  
7
8 9 0  
!
4
1 RCA cable ground lead terminal  
5 LINE IN terminal  
2 FILTER switch  
6 Speaker level input terminals  
These switches allow filtering of the  
speaker output signals.  
7 Fuse (20 A × 2 : KAC-728)  
Fuse (25 A × 1 : KAC-628)  
Fuse (15 A × 1 : KAC-528)  
KAC-628  
KAC-728/528  
FILTER  
OFF  
FILTER  
OFF LPF  
HPF  
LPF  
8 Battery terminal  
9 Ground terminal  
0 Power control (REMOTE) terminal  
• HPF (High Pass Filter) position  
(KAC-628 only)  
Only frequencies of 150 Hz or higher are  
output. (Frequencies below 150 Hz are cut.)  
! SPEAKER OUTPUT terminals  
• 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.  
• 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 2or 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 high-  
output 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 4or greater. When  
multiple speakers are to be connected,  
ensure that the combined impedance is 4Ω  
or greater.  
3 OPERATION switch  
This switch allows selection of the  
amplification method of input signals.  
KAC-628  
KAC-728/528  
OPERATION  
STEREO MONO(Lch)  
OPERATION  
L+R  
STEREO MONO(Lch)  
• 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.  
2CAUTION  
The rated input of the speakers should be  
no less than the maximum output of the  
amplifier. Otherwise malfunction may  
result.  
• 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 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.  
10  
0.5 0.3  
15  
NOTE  
1.0  
For the pre-output level or  
the maximum power output,  
refer to the “Specifications”  
MIN  
MAX  
25  
(W)  
in the instruction manual of the center unit.  
5
Connection  
RCA cable connection  
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.  
Right input  
Left input  
RCA cable ground terminal  
SPEAKER LEVEL INPUT  
LEFT RIGHT  
OPERATION  
STEREO MONO(Lch)  
FILTER  
OFF LPF  
LINE IN  
D
N
G
L
R
0.5 0.3  
1.0  
GND  
MIN  
INPUT  
SENSITIVITY(V)  
MAX  
To Power control  
(REMOTE) terminal  
RCA cable  
(Commercially  
available part)  
Left output (White)  
Right output (Red)  
CENTER UNIT  
(Cassette receiver,  
CD receiver, etc.)  
RCA cable ground 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.  
Speaker level input connection  
Connect the unit by inserting it in the connection between the genuine-accessory car stereo  
and speakers.  
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.  
Right input  
Left input  
T
H
IG  
R
SPEAKER LEVEL INPUT  
LEFT RIGHT  
T
F
SPEAKER LEVEL INPUT  
LE  
OPERATION  
STEREO MONO(Lch)  
FILTER  
OFF LPF  
LINE IN  
L
R
0.5 0.3  
GND  
MIN  
INPUT  
SENSITIVITY(V)  
MAX  
Lead terminal  
(Commercially available parts)  
To Power control  
(REMOTE) terminal  
Left output  
Genuine-accessory  
car stereo  
Right output  
Battery  
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.  
• 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
Speakers cable connection  
(Stereo Connections)  
Left output  
Right output  
T
H
IG  
R
POWER IN  
BRIDGED  
T
F
E
L
GND  
BRIDGED  
LEFT  
BATT  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
POWER AMPLIFIER  
Lead terminal  
(Commercially available parts)  
Right  
speaker  
Left  
speaker  
(Bridged Connections)  
T
H
IG  
R
POWER IN  
BRIDGED  
T
F
E
L
GND  
BRIDGED  
LEFT  
BATT  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
POWER AMPLIFIER  
Lead terminal  
(Commercially available parts)  
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 2or greater (for  
stereo connections), or 4or 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.  
Examples:  
Model  
KAC-728  
KAC-628  
KAC-528  
Stereo Connections (4)  
Bridged Connections (4)  
200 W or greater  
100 W or greater  
70 W or greater  
600 W or greater  
300 W or greater  
200 W or greater  
200W  
(2)  
100W  
200W  
100W  
(8)  
200W  
200W  
200W  
(4)  
(8)  
(4)  
(4)  
(4)  
200W  
(2)  
4  
4 Ω  
4 Ω  
Maximum output of  
the amplifier  
Combined  
impedance  
Rated input power and  
impedance of the speakers  
7
Connection  
Power cable connection  
2WARNING  
To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the  
battery’s positive terminal.  
POWER IN  
GND  
BRIDGED  
LEFT  
BATT  
P.CON(REMOTE)  
RIGHT  
SPEAKER OUTPUT  
POWER AMPLIFIER  
Power terminal  
Round terminal (Small)  
Round terminal (Medium)  
Terminal cover  
CENTER UNIT  
Car fuse box  
Power control cable  
(Commercially available parts)  
ACC  
Battery cable  
(Commercially available parts)  
Ground cable  
(Commercially available parts)  
Round terminal (Large)  
Protective  
Fuse  
Battery  
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.  
8
Example: One Power Amplifier Is Used  
Model  
Maximum Current  
Drawn  
Protective Fuse  
Cross-sectional Area of Wiring  
Cable (AWG)  
2
KAC-728  
KAC-628  
KAC-528  
28 A  
19 A  
16 A  
50 A × 1 [25 A × 2]  
30 A × 1  
5 mm (AWG 10) or greater × 1  
2
3 mm (AWG 12) or greater × 1  
2
25 A × 1  
3 mm (AWG 12) or greater × 1  
25 A  
25 A  
50 A  
25 A  
25 A  
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.  
• 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.  
9
System examples  
Full-range 2-channel system  
KAC-728/528  
Left speaker  
L
L
OPERATION  
FILTER  
OFF  
LPF STEREO MONO(Lch)  
CENTER UNIT  
R
R
Right speaker  
KAC-628  
OPERATION  
L+R  
FILTER  
OFF  
HPF  
LPF STEREO MONO(Lch)  
Switch setting  
High-power full-range 2-channel system  
L
KAC-728/528  
L
L
Left speaker (Bridged)  
Right speaker (Bridged)  
OPERATION  
FILTER  
OFF  
LPF STEREO MONO(Lch)  
R
R
CENTER UNIT  
Switch setting  
L
L
KAC-628  
R
OPERATION  
L+R  
FILTER  
R
R
OFF  
HPF  
LPF STEREO MONO(Lch)  
Full-range 2-channel + Subwoofer system  
KAC-728/528  
Left speaker  
OPERATION  
FILTER  
CENTER UNIT  
OFF  
LPF STEREO MONO(Lch)  
Right speaker  
KAC-628  
L
L
Subwoofer  
(L + R)  
(Bridged)  
OPERATION  
L+R  
FILTER  
OFF  
HPF  
R
R
LPF STEREO MONO(Lch)  
Switch setting  
Tri-mode  
L
C
C
KAC-728/528  
Subwoofer  
(L + R)  
(Bridged)  
OPERATION  
L
L
FILTER  
High  
pass  
OFF  
LPF STEREO MONO(Lch)  
CENTER UNIT  
Switch setting  
R
R
KAC-628  
OPERATION  
L+R  
FILTER  
OFF  
HPF  
LPF STEREO MONO(Lch)  
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  
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)  
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).  
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.  
10  
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.)  
• Input (or output) cables are  
disconnected.  
• Connect the input (or output)  
cables.  
• Protection circuit may be  
activated.  
• Check connections by referring  
to "Protection function".  
• The fuse may be blown because • Replace the fuse with a new  
the volume was too high.  
fuse and use a lower volume.  
The output level is too  
small (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".  
11  
Specifications  
Specifications subject to change without notice.  
Audio Section ..............................................KAC-728  
Max Power Output (4 )  
KAC-628  
KAC-528  
Normal..............................................................200 W × 2  
Bridge ..............................................................600 W × 1  
Rated Power Output (4 )  
100 W × 2  
300 W × 1  
70 W × 2  
200 W × 1  
Normal (DIN45324, +B=14.4 V) ......................100 W × 2  
Bridge (1 kHz, 0.8 % THD) ..............................300 W × 1  
Rated Power Output (2 )  
50 W × 2  
150 W × 1  
35 W × 2  
100 W × 1  
Normal (1 kHz, 0.8 % THD)..............................150 W × 2  
75 W × 2  
50 W × 2  
5 Hz ~ 50 kHz  
100 dB  
0.2 V  
Frequency Response (+0, –1 dB) ........................5 Hz ~ 50 kHz 10 Hz ~ 45 kHz  
Signal to Noise Ratio............................................100 dB  
Sensitivity (MAX) (rated output) ..........................0.2 V  
Sensitivity (MIN) (rated output) ............................5.0 V  
Input Impedance ..................................................10 kΩ  
Low Pass Filter (12 dB/oct.) ................................80 Hz  
High Pass Filter (12 dB/oct.) ................................  
100 dB  
0.15 V  
4.0 V  
10 kΩ  
80 Hz  
150 Hz  
5.0 V  
10 kΩ  
80 Hz  
General..........................................................KAC-728  
Operating Voltage (11 ~ 16 V allowable)..............14.4 V  
Current Consumption (1 kHz, 10% THD) ............28 A  
KAC-628  
14.4 V  
KAC-528  
14.4 V  
19 A  
16 A  
Dimensions (W × H × D)[mm] ..............................220 × 56.1 × 300220 × 56.1 × 228 220 × 55 × 160  
Weight..................................................................3.6 kg  
2.7 kg  
1.8 kg  
12  

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