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Noise/Hum
• Checkthesignalcablebetweenthemixerand
the loudspeaker. Make sure all connections are
secure. These problems usually produce crackling
noises or hum.
• IfyouareusingtwoormoreTH-12Apowered
loudspeakers, try plugging them all into the same
AC outlet panel or outlet strip. The purpose for
this is to connect them all to the same earth
ground point and reduce the possibility of creating
a ground loop.
• IfconnectinganunbalancedoutputtotheTH-12A
balanced input, make sure the shield is connected
to the unbalanced ground and to pin 1 of the XLR.
Repair
For warranty service, refer to the warranty
information on page 16.
Non-warranty service for Mackie products is
available at a factory-authorized service center. To
locate your nearest service center, call our 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.
Appendix B: Connections
XLR Connectors
XLR connectors are used to make balanced input
and through connections to the TH-12A. They are wired
as follows, according to standards specified by the AES
(Audio Engineering Society).
XLR
Hot(+)Pin2
Cold(–)Pin3
Shield (Ground) Pin 1
Balanced XLR Connectors
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
Need help with your new loudspeaker?
• Visit www.mackie.com and click Support to nd: FAQs, manuals, addendums, and other documents.
• Email us at: techmail@mackie.com.
• Telephone 1-800-898-3211 to speak with one of our splendid technical support chaps (Monday
through Friday, normal business hours, PST).