Troubleshooting Guide; Specifications - Kenwood KAC-M645 Instruction Manual

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
No sound.
(No sound from one side.)
(Blown fuse.)
The output level is too
small (or too large).
The sound quality is bad.
(The sound is distorted.)

Specifications

Audio Section ...................................................................... KAC-M845 KAC-M645
Max Power Output .....................................................................................720 W (180 W × 4) 500 W (125 W × 4)
Rated Power Output
Normal (4 Ω) (20 Hz – 20 kHz, 1 % THD) ............................................... 60 W × 4 40 W × 4
Normal (2 Ω) (1 kHz, 1 % THD).................................................................... 90 W × 4 60 W × 4
Bridged (4 Ω) (1 kHz, 1 % THD).................................................................180 W × 2 130 W × 2
Frequency Response (+0, –3 dB) .................................................................... 5 Hz – 50 kHz 5 Hz – 50 kHz
Sensitivity (rated output) ........................................................................................0.2 V – 5.0 V 0.2 V – 5.0 V
Signal to Noise Ratio ...............................................................................................................94 dB 94 dB
Input Impedance ..................................................................................................................... 10 kΩ 10 kΩ
Low Pass Filter Frequency (-12 dB/oct.).....................................50 – 200 Hz (variable) 50 – 200 Hz (variable)
High Pass Filter Frequency (-12 dB/oct.) ......................................................................80 Hz 80 Hz
General ................................................................................ KAC-M845 KAC-M645
Operating Voltage .................................................................... 14.4 V (11 – 16 V allowable) 14.4 V (11 – 16 V allowable)
Current Consumption .............................................................................................................. 36 A 19 A
Dimensions (W × H × D) .......................................................................330 × 59 × 230 mm 330 × 59 × 230 mm
Weight ...........................................................................................................................................2.9 kg 2.7 kg
• Specifications subject to change without notice.
8 English
POSSIBLE CAUSE
• Input (or output) cables are
disconnected.
• Protection circuit may be activated.
• Volume is too high.
• The speaker cord is shorted.
• The input sensitivity adjusting control
is not set to the correct position.
• The speakers wire are connected with
wrong 9 / · polarity.
• A speaker wire is pinched by a screw
in the car body.
• The switches may be set improperly.
SOLUTION
• Connect the input (or output) cables.
• Check connections by referring to
<Protection function>.
• Replace the fuse and use lower
volume.
• After check the speaker cord and fixing
the cause of the short, replace the fuse.
• Adjust the control correctly referring to
<Controls>.
• Connect them properly checking the
9 / · of the terminals and wires well.
• Connect the speaker wire again so that
it is not pinched by anything.
• Set switches properly by referring to
<Controls>.