Troubleshooting Guide; Specifications; Power Indicator - Kenwood KAC-8404 Instruction Manual

Controls
NOTE
The control panel locates under the dressing cover. Remove the cover to
access to its controls for adjustment. (See page 3)

1 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. Refer to <Protection function> (page 3).
2 Illumination
3 FILTER FREQUENCY control (A.ch/B.ch)
Sets the cutoff frequency when the "FILTER" switch is set to "LPF" or "HPF".
4 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.
Use the diagram on the right as a guide.
The sensitivities of amplifiers A and B can be adjusted independently.
5 FILTER switch (A.ch/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 "FILTER 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 "FILTER FREQUENCY" control.
6 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.
7 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 +18 dB.
• OFF position:
BASS BOOST is OFF.

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.
No sound. (Blown fuse.)
✔
Input (or output) cables are disconnected.
☞
Connect the input (or output) cables.
✔
Protection circuit may be activated.
40W
☞
Check connections by referring to <Protection function>.
30W
✔
Volume is too high.
20W
☞
Replace the fuse and use lower volume.
15W
✔
The speaker cord is shorted.
☞
After check the speaker cord and fixing the cause of the short, replace the
fuse.
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 wire are connected with wrong 9 / · polarity.
✔
Connect them properly checking the 9 / · of the terminals and wires
☞
well.
✔
A speaker wire is pinched by a screw in the car body.
☞
Connect the speaker wire again so that it is not pinched by anything.
✔
The switches may be set improperly.
☞
Set switches properly by referring to <Controls>.

Specifications

CEA-2006
Primary Power Output Ratings (RMS Watts per
channel @ 4 ohms, 1 % THD+N)
Signal to Noise Ratio
(Reference: 1Watt into 4 ohms)
Audio Section
Max Power Output
Rated Power Output (+B = 14.4 V)
Normal (4 Ω) (20 Hz – 20 kHz, 0.08 % THD)
Normal (4 Ω) (DIN : 45324 , +B = 14.4V)
Normal (2 Ω) (1 kHz, 0.8 % THD)
Bridged (4 Ω) (1 kHz, 0.8 % THD)
Frequency Response (+0, –3 dB)
Sensitivity (rated output)
Input Impedance
Signal to Noise Ratio
Low Pass Filter Frequency (-12 dB/oct.)
High Pass Filter Frequency (-12 dB/oct.)
Bass Boost Circuit (40 Hz) (B channel)
General
Operating Voltage
Current Consumption
Installation Size (W × H × D)
Weight
* Specifications subject to change without notice.
50 W × 4
80 dBA
600 W (150 W × 4)
50 W × 4
50 W × 4
75 W × 4
180 W × 2
5 Hz – 50 kHz
0.2 V – 5.0 V
10 kΩ
100 dB
50 – 200 Hz (variable)
50 – 200 Hz (variable)
0/ +18 dB
14.4 V (11 – 16 V allowable)
40 A
280 × 59 × 238 mm
11 × 2-5/16 × 9-3/8 inch
2.8 kg (6.2 lbs)
English 5