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Repair
If your unit needs service, please re-review the troubleshooting section first.
Contact your dealer or call tech support at 1-800-554-0150 9am to 5pm Pacific time, Monday through Friday.
We will try and respond to emails sent to techsupport@hsuresearch.com within two business days.
Problem Cause Solution
• Check that the power cord is plugged in securely at both ends and
make sure that the power outlet the subwoofer is plugged into is
working.
• Check the fuse. The fuse is located on the amplifier, near the power
plug. Unplug the power cord and remove the fuse holder with a flat
head screwdriver. If the fuse is blown, the output transistors are
probably damaged. Contact the dealer or call/e-mail technical support
for authorization to send the amplifier back for service.
• Recheck the connections between the source and the subwoofer.
• With the volume on the subwoofer turned to a low setting, try
plugging the subwoofer directly into a CD player or lightly touching
the unplugged end of the input cable. If you hear noise from the sub-
woofer, the problem is with your connection to the system. If you
hear no noise, try turning the volume on the subwoofer up some more.
If you still hear no noise, contact your dealer or call/e-mail technical
support for authorization to send the amplifier back for service.
• Return the subwoofer to the dealer or contact HSU Research.
• Return the subwoofer to the dealer or contact HSU Research.
• Correct the polarity of the speaker wires by matching the +/- from
the receiver/amplifier to the +/- of the subwoofer’s speaker level input.
• Connect only to the channel that has a true ground ‘ - ’. If neither
channel has a true ground ‘ - ’, contact your dealer or e-mail/call
technical support.
• Increase the volume of the subwoofer and the subwoofer level or
LFE level on the receiver or other source. It is best to set the level
of the subwoofer relative to the other speakers using a test disk and
a Radio Shack SPL meter, or built-in tones on your pre-amp/pro-
cessor. See “Volume Level” in Step 4.
• When you shut down your equipment, turn off the subwoofer first.
When powering up, turn on the subwoofer last.
No output from
the subwoofer
(the LED does not
light up).
No output from the
subwoofer (LED
lights up red).
No output from the
subwoofer (LED
turns green).
Little or no sound
from one main
speaker..
Bass output from
subwoofer is low.
Subwoofer
thumps when the
system is being
turned on and off.
AC power is not getting to the
amplifier.
The amplifier’s fuse is blown.
The subwoofer is not receiving a
signal.
Subwoofer amplifier is faulty.
Connection between subwoofer
amplifier and woofer is faulty.
Driver or amplifier is faulty.
You used speaker level connections
and have mixed up the polarity of
the wires, thus shorting one channel
of the main amplifier.
You used speaker level connections
and one or both your main amplifier’s
‘ - ’ are not true ground.
Level on subwoofer or receiver’s
subwoofer output is too low.
Noise is being generated by up-
stream equipment.
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