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Troubleshooting
PROBLEMS
SOLUTIONSCAUSE
Humming or buzzing noise.
No output from the
Sub-1200 (the LED does
not light up).
Bass response sounds
"weak" or "unstable".
Excessive "rumbling"
sound from Sub-1200
output.
You may have a ground loop
problem.
There may be a problem with
other external equipment.
AC power is not making it to
the Sub-1200.
The amplifier’s fuse is blown.
The Sub-1200 and main
speakers are out of phase.
The ‘crossover’ is set too low.
The ‘level’ control is set too
high.
The external amplifier’s built-in
crossover, EQ or tone settings
are not balanced correctly.
Try using a cheater plug. Do NOT ground
the grounding tab on the cheater plug!
That would defeat the purpose of the
cheater plug for this application.
Disconnect all interconnect cables from
the Sub-1200 and any external
equipment. If hum goes away when
interconnects are disconnected, hum is
coming from the rest of your equipment.
Add them back one piece at a time. The
one that causes the system to hum is the
source of the hum.
Check that the power cord is plugged in
securely at both ends and make sure
that the power outlet the Sub-1200 is
plugged into is functioning properly.
Unplug the power cord and remove the
fuse holder with a screwdriver and check
the fuse (located just above the power
plug). If the fuse is blown, replace. If the
fuse blows again, the output transistors
are probably damaged. At that point, it is
recommended to email or call technical
support for authorization to send the
Sub-1200 back for service.
Place the ‘phase’ switch in its alternate
position (0-180).
Adjust the ‘crossover’ to a higher setting
i.e. 80Hz or 120Hz.
Adjust the ‘level’ control to a lower
setting.
Adjust the external amplifiers crossover,
EQ or tone settings