Owner's Manual
Table Of Contents
liMy amplifier shuts
off
once in a while, usually
at
higher volumes"
Check
your voltage source
and
grounding point. The power supply
of
the M4300 will operate with charging system voltages
down to
lOY.
Shutdown problems at higher volume levels
can
occur when the charging system voltage drops below
lOY.
These dips can be
of
very short duration making them
extremely difficult to detect with a
common
DC voltmeter.
To
ensure proper voltage, inspect all wiring
and
termination
points.
It
may also be necessary to upgrade the vessel's
battery wires. Many vessels employ small
(10
AWG
- 6
AWG)
wire to ground the battery
and
to connect the alternator to
the battery.
To
prevent voltage drops, these wires should be
upgraded to 4
AWG
when installing amplifier systems with
main fuse ratings above 60A. Grounding problems are the
leading cause
of
misdiagnosed amplifier "failures.
liMy amplifier turns on,
but
there
is
no
output"
Check
the input signal using an
AC
voltmeter to measure the
voltage from the source unit while an appropriate test tone
is
played
through
the source unit (disconnect the input cables
from the amplifier prior to this test). The frequency used
should be in the range that
is
to be amplified by the amplifier
(example: 50
Hz
for a sub bass application or 1
kHz
for a full
range / high-pass application). A steady, sufficient voltage
(between 0.2
and
8.0-volts) should be present at the output
of
the signal cables.
Check
the
output
ofthe amplifier. Using the procedure explaine'd in
the previous check item (after plugging the input cables back
into the amplifier) test for output at the speaker outputs
of
the amplifier. Unless you enjoy test tones at high levels, it
is
a good idea to remove the speaker wires from the amplifier
while doing this. Turn the volume up approximately
half
way.
5V or more should be measured at the speaker outputs.
This output level can vary greatly between amplifiers but it
should
not
be in the millivolt range with the source
unit
at
half
volume.
If
you are reading sufficient voltage, check your
speaker connections
as
explained below.
Check
to ensure that the speaker wires are making a good
connection with the metal inside the terminal block. The
speaker wire connectors are designed to accept up to 8
AWG
wire. Make sure to strip the wire to allow for a sufficient
connection with the metal inside the terminal block.
~L
AUDIO
M4300
17