Emotiva UPA-7 manual Other Probable Causes of Noise

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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