Emotiva 10 - Manual (Page 18)

Troubleshooting Guide
Ultra Subwoofers are expertly designed and built to provide years of trouble‐free performance. Most problems that occur
can usually be solved by checking your setup or making sure that the audio and video components connected to the amplifier
are on and fully operational.
The following information will help you deal with other common setup problems you may experience during normal use of
your unit. If problems persist, contact Emotiva support for help.
No Sound (from one or more speakers connected to the amplifier)
• The connection between the subwoofer and preamplifier/processor may have come undone. Turn off your system
and check the cables.
• Damaged audio cable.
• A preamplifier Mute switch may be on, an external processor loop or a tape monitor loop is engaged.
• Check main power switch to make sure that it is in on position (1).
• An internal fuse on the unit may have blown. Contact Emotiva Support for assistance.
Turn‐on and Turn‐off Thumps
• Plug the Ultra Subwoofer into a different 115VAC outlet than the amplifier powering your system speakers so there
is no power turn on conflicts.
• Install a line‐conditioning device.
“Hum” Noises
• This problem is more than likely caused by a “ground loop” in your system, rather than a fault in the subwoofer.
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 before disconnecting or connecting any cables during troubleshooting.
• Try to have all of your equipment on the same electrical outlet or circuit. Group all the low power components
(preamp, CD player, DVD etc.) on a single outlet or power strip. This is provided that the overall current draw from
your equipment does not exceed the rating of the outlet or breaker.
• Disconnect all cables, which come from outside the room, and check if the hum goes away. This includes such
connections 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 preamplifier 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 placed in
line with the coaxial cable feed. Contact your Cable Company or Emotiva for assistance.
• Disconnect all connections from the preamplifier to your TV, VCR or DVD.
• As a test, disconnect any other component, which has a grounded power cord.
NOTE: Never remove the ground pin from any power cords (if present). This is very dangerous.
If the hum persists, disconnect all the source components one at a time from the back of the preamplifier, until you identify
the problem.
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