Mackie SRM550 Owner's Manual page 19

Hum
• Try disconnecting the cable connected to the main
input jack. If the noise disappears, it could be
a "ground loop," rather than a problem with the
SRM loudspeaker. Try some of the following
troubleshooting ideas:
• Use balanced connections throughout your system
for the best noise rejection.
• Whenever possible, plug all the audio equipment's
line cords into outlets which share a common
ground. The distance between the outlets and the
common ground should be as short as possible.
Repair
For warranty service, refer to the warranty
information on page 27.
Non-warranty service is available at a factory-
authorized service center. To locate the nearest
service center, visit www.720trees.com, click "Contact
Tech Support" and select "Locate a Service Center
or Distributor" [3]. Service for SRM loudspeakers living
outside the United States can be obtained through local
dealers or distributors.
If you do not have access to our website, you may call
the Tech Support department at 1-800-898-3211,
Monday-Friday, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell you
where the nearest factory-authorized service center is
located in your area.
19
Owner's Manual