Emotiva UPA-7 - Manual (Page 22)

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 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.
• Try moving the speaker cables away from any power cords. Try just one speaker, connecting it to
each amplifier channel and see if one channel is bad.
• Check that the interconnect cables to the amplifier do not have any broken connections. The
best way to do this is to substitute a known good connection for the suspect connection. If you
reverse the cables and the problem goes away, the cable may be damaged or broken. This is
possible even if you can’t physically see the break as the strain for pulling on audio cables can
sometimes break the wire internally.
Ground loop isolators are available for audio lines and video devices. If you need assistance, contact
Emotiva. Although this is not always an ideal solution, the grounding differences between certain home
entertainment components sometimes require ground loop isolators. This is the exception rather than the
rule.
Other Probable Causes of Noise
• Speaker noise may also be caused by interference or noise on your AC line. Make sure there are
no large appliances sharing the line, or halogen lamps or light-dimming Triac devices.
• Try connecting your system to another AC socket on a separate line.
• If the hum is heard from within the UPA-7, and not through the speakers, this may also be caused
by interference on the AC or DC lines. The power transformers may turn this interference into an
audible noise. Internal hum can be made worse by a shelf or cabinet resonating, so try moving
the UPA-7 to another shelf.
• Try moving your components further away from the TV, especially if you notice the screen has
changed color in the area closest to the component.
• If you have very high efficiency speakers, these may tend to reveal noises, which other speakers
do not.
One or more RED lights on the Front Panel are Blinking
Your UPA-7 Amplifier is equipped with a ‘Protect Mode’ to minimize the possibility of damage to either
itself or speakers. If a problem is detected, the channel(s) at risk will shut down, following a red blinking
on the corresponding indicator light(s).
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