uandksound M6 Series, Owner'S Manual

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M6 SERIES
NOTES ABOUT HUM
While the M1200N amplifier has been designed to minimice the
possibility of hum in the subwoofer system, it is still possible that a
hum will occur in rare circumstances. Safely grounding can create a
path for smaII amounts of 50/ 60Hz energy to travel trough the line
level audio system. While no dangerous, this energy can cause
difficulty with the subwoofer auto signal sensing circuit, and at the
very least will interfere with the quiet enjoyment of your system. The
first course of action should be trying to make sure that all of the
audio components are connected to either the same electrical
outlet, or at least into the same circuit branch. Next, cable TV systems
are notoriously the culprit, so be sure to try disconnecting all coaxial
feeds that are connected to the system. If this solves the problem,
install a coaxiaI line isolator and reconnect the system. In the very
worst case, a line level audio isolator/transformer connected to the
line in of the subwoofer amplifier will usualIy solve the problem.
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