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21
Check your voltage source and grounding point. The power supply
of the MDH900/5-24V will operate with charging system
voltages down to 18V. Shutdown problems at higher volume
levels can occur when the charging system voltage drops
below 18V. 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
ground wire connecting the battery to the vessel’s chassis
and the power wire connecting the alternator to the battery.
Many vessels employ small (10 AWG - 6 AWG) wire to ground
the battery to the vessel’s chassis 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.”
“My 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 200mV and 8.0-volts) should be present at the
output of the signal cables.
Check the output of the amplifier. Using the procedure explained
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 Connector Plugs
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 Speaker Connector
Plugs. The speaker wire connectors are designed to accept up
to 12 AWG wire. Make sure to strip the wire to allow for a
sufficient connection with the metal inside each terminal.
21


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