Filter
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5
1
RCA cable ground lead terminal
2
FILTER switch
These switches allow filtering of the
speaker output signals.
• HPF (High Pass Filter) position
(KAC-628 only)
Only frequencies of 150 Hz or higher are
output. (Frequencies below 150 Hz are cut.)
• 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
OPERATION switch
This switch allows selection of the
amplification method of input signals.
• 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.
• 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.
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 terminal
6
Speaker level input terminals
7
Fuse (20 A
×
2 : KAC-728)
Fuse (25 A
×
1 : KAC-628)
Fuse (15 A
×
1 : KAC-528)
8
Battery terminal
9
Ground terminal
0
Power control (REMOTE) terminal
!
SPEAKER OUTPUT terminals
• 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 2Ω or 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 4Ω or greater. When
multiple speakers are to be connected,
ensure that the combined impedance is 4Ω
or greater.
The rated input of the speakers should be
no less than the maximum output of the
amplifier. Otherwise malfunction may
result.
2CAUTION
NOTE
MAXMIN
0.30.5
1.0
(W)
25
15
10
LPF
FILTER
OFF
KAC-728/528
LPF
FILTER
HPF
OFF
KAC-628
MONO(Lch)
STEREO
OPERATION
KAC-728/528
MONO(Lch)
STEREO
L+R
OPERATION
KAC-628