Kenwood KAC-8403 Instruction Manual page 5

Controls
This is a 4 channel amplifier including 2 stereo
amplifiers in a body. One amplifier is referred
to as amplifier A and the other is amplifier B.
This unit is compatible with a large variety of
systems by combining the switches and functions
described in the following.
1 Fuse (40 A)
NOTE
If you can't find the specified capacity fuse at your
store etc., consult your Kenwood dealer.
2 Battery terminal
3 Ground terminal
4 Power control terminal
Controls the unit ON/OFF.
NOTE
Controls the unit power. Be sure to connect it with
all the systems.
5 Speaker output terminals (A.ch/B.ch)
• 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
9 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.
2CAUTION
The rated input of the speakers should be no
less than the maximum output of the amplifier.
Otherwise malfunction may result.
NOTE
The control panel locates under the dressing cover. Remove the cover
to access to its controls for adjustment. (See page 3)
6 Speaker level input terminals
NOTE
• The genuine-accessory car stereo shall have a
maximum power output of no more than 40 W.
• Do not connect the speaker output leads from
a power amplifier (Optional) to the speaker level
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 level 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.
7 LINE IN terminal (A.ch/B.ch)
8 LINE OUT terminal
These jacks output respectively the signals input
to amplifiers A and B.
They always output the stereo signals regardless
of the position of the "OPERATION" switch.
9 Power indicator
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. (See page 2)
0 Illumination
! FILTER switch (A.ch)
This switch allows to apply high-pass filtering to
the speaker outputs.
• HPF (High-Pass Filter) position:
The filter outputs the band of higher frequencies
than the frequency set with the "HPF
FREQUENCY" control.
• OFF position:
The entire bandwidth is output without filtering.
@ OPERATION switch (A.ch/B.ch)
The amplification methods of the signals input to
amplifiers A and B can be selected independently
according to the setting of this switch.
• 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.)
15W – 40W
# INPUT SELECTOR switch
This switch selects the input method of the
signals to be amplified by amplifiers A and B.
• A B position:
Amplifies both of the signals input to amplifiers
A and B.
• A position:
Amplifies only signal input amplifier A with both
amplifiers A and B.
$ FILTER switch (B.ch)
This switch allows to apply high-pass or low-pass
filtering to the speaker outputs.
• HPF (High-Pass Filter) position:
The filter outputs the band of higher frequencies
than the frequency set with the "HPF
FREQUENCY" control.
• OFF position:
The entire bandwidth is output without filtering.
• LPF (Low-Pass Filter) position:
The filter outputs the band of lower frequencies
than the frequency set with the "LPF
FREQUENCY" control.
The speaker output is automatically switched to
monaural (L+R).
% BASS BOOST switch (B.ch)
Setting this switch to "ON" emphasizes the bass.
You can use the BASS BOOST for amplifier B only.
• ON position:
BASS BOOST is +6 dB.
• OFF position:
BASS BOOST is OFF.
^ HPF FREQUENCY control (A.ch/B.ch)
Sets the cutoff frequency when the "FILTER"
switch is set to "HPF".
& LPF FREQUENCY control (B.ch)
Sets the cutoff frequency when the "FILTER"
switch is set to "LPF".
* INPUT SENSITIVITY control (A.ch/B.ch)
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.
The sensitivities of amplifiers A and B can be
adjusted independently regardless of the position
of the input selector switch.
Use the diagram on the right as a guide.
NOTE
For the pre-output level or the maximum power
output, refer to the <Specifications> in the
instruction manual of the center unit.
English 5