Emotiva Airmotiv 4s User Manual page 29

Problem: Excessive hum or noise
• Read the chapter titled Avoiding Hum and Noise in the Connections section of this manual.
• Check your signal source.
• Verify that all cables are plugged fully in, that the connectors fit tightly, and that the cables
and connectors are in good condition.
• Try repositioning cables. If you have signal cables running near power cables, try moving
them further apart. (This is especially important with unbalanced cables.)
• If you are using unbalanced connections, try higher-quality cables with better shielding. If
that reduced but fails to eliminate the hum, consider trying balanced cabling (especially for
long runs or where runs next to power cables are unavoidable).
• If you're already using a balanced connection, the balanced outputs on some equipment
may offer various options including "ground lift". While none of these options is specifically
recommended, some may produce good results in some situations.
• Some audio equipment (especially vacuum tube type) has a high output impedance, which
makes it inherently sensitive to picking up hum and noise, especially if only unbalanced
connections are provided. It is essential that signal cables used with such equipment be kept
short, of good quality, and not run near power cables.
• In a new installation, especially in a studio environment, verify that your cables are wired
properly. (In studios, pros often customize cables for various reasons, which may include
removing ground connections from one or both ends.) If you suspect that your cables are
non-standard, either check them with an ohmmeter or try another cable.
• Some difficult installations may require a balanced connection to completely eliminate hum
and noise.
Problem: Unbalanced sound or poor imaging
• Verify that the rear panel equalization controls, which are used to compensate for speaker
position and room acoustics, are set in the same position for each monitor. In general,
although some situations may demand unusual settings, the best performance will be
achieved if the equalization controls on symmetrical pairs of monitors, such as a single pair of
monitors or a pair of surrounds, are set the same. If not, uneven frequency response and poor
imaging may result.
Problem: No sound from only one transducer
• Check your signal source.
• Try swapping monitors. If the problem is definitely associated with one unit, then contact
Emotiva Technical Support.
Page 25