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Mackie SWA1501 Subwoofer audio hum


the sub on and off based upon the presence of an audio signal is not working correctly and the sub is trying to reproduce 60 cycle hum. The unit needs service. Dan more...
.   Mackie SWA1501 Subwoofer - Troubleshooting


line filter or plug the SWA1501 into a different AC circuit. Hum Try disconnecting the cable connected to the INPUT jack. the best noise rejection. Whenever possible, plug all the audio equipment's linecords into outlets which share a common ground. The distance more...
.   Mackie SWA1501 Subwoofer - User Guide (page #8)

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