40
User's Manual
Troubleshooting
A Hum is heard in your speakers
This problem is more than likely caused by a
“ground loop” in your system, rather than a
fault in the Theater Grand Processor. Follow
these steps to isolate the main cause of the
hum, there may even be more than one.
• Remember to turn off all components
in your system, including the amplifiers
and the Theater Grand Processor,
before disconnecting or connecting
any cables.
• Disconnect the following items in
order, and check each time if the hum
has gone away:
• Disconnect all cables which come
from outside the room, such as cable
TV, satellite TV, or roof top antennas.
Make sure that they are disconnected
where they first enter the room, so
they are making no connection to the
Theater Grand Processor or the TV, or
any other component. If the hum is
caused by the cable TV line, then you
will need a “ground loop isolator.” This
is an inexpensive device fitted in line
with the coaxial cable feed. Contact
your cable company or your Sunfire
Dealer for assistance.
• Disconnect all connections from the
Theater Grand Processor to your TV.
• Disconnect any component which has
a grounded power cord.
• If the hum persists, disconnect all the
source components one at a time from
the back of the Theater Grand Proces-
sor, until you identify the problem.
• There are ground loop isolators
available for audio lines and video.
You can ask your Sunfire Dealer for
assistance.
• In the end, you will be left with the
Theater Grand Processor connected
to the amplifiers. If the amplifier has
the option, use balanced connections.
• Disconnect the amplifiers from the
Theater Grand. If the hum persists, try
moving the speaker cables away from
any power cords. Try just one speaker,
connecting it to different channels and
see if an amplifier channel is bad.
• If you are still having a problem,
remember that Sunfire’s dealers and
technical support staff will assist you.
Other causes of noise
• Speaker noise may also be caused by
interference or noise on your AC line.
Make sure there are no large appli-
ances sharing the line, or halogen
lamps or light-dimming SCR devices.
• Try connecting your system to another
AC socket on a separate line.
• If the hum is heard from within the
amplifier and not through the speak-
ers, this may also be caused by
interference on the AC line. Some
amplifier transformers will turn this into
an audible noise. Internal hum can be
made worse by a shelf or cabinet
resonating, so try moving the amplifier
to another shelf.
• Try moving your Theater Grand Proces-
sor further away from your amplifiers.
There may be some effect from the
strong magnetic fields which surround the
amplifier’s power transformer.
• Try moving your components further
away from the TV, especially if you ever
notice the screen has changed color in
the area closest to the component.
• If you have very high efficiency speak-
ers, these may show up noise which
other speakers may not. If your
amplifier has gain controls, you should
turn them down a little to reduce the
noise. Remember to repeat the
calibration procedure so all speakers
are playing at the same level.
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