Noise/Hum
•Check the signal cable between the mixer and the loudspeaker. Make sure all connections are secure. These problems usually produce crackling noises or hum.
•If you are using two or more TH-12A powered 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.
•If connecting an unbalanced output to the TH-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 (+) Pin 2
Cold (–)Pin 3
Shield (Ground) Pin 1
SHIELD 2
HOT
COLD 3 1
SHIELD 1
COLD 3 2
HOT
1SHIELD
3COLD
2HOT
Balanced XLR Connectors
Need help with your new loudspeaker?
•Visit www.mackie.com and click Support to find: 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).