MACKIE SWA2801Z
Manual de Usuario

No sound
� Is the input LEVEL control for the input source or the subwoofer turned all the way down? Verify that all the volume controls in the system are properly adjusted. � Is the signal source working (and making union scale)? Make sure the connecting cables are in good repair and securely connected at both ends. Make sure the output volume (gain) control on the mixing console is turned up sufficiently to drive the inputs of the speaker. � Make sure the mixer does not have a Mute on or a Processor loop engaged. If you find something like this, make sure the volume/gain is turned down before disengaging the offending switch. � Is the thermal protection circuit activated? Make sure there is at least six inches of free space behind the SWA801z.

Noise
� Make sure all connections to the active loudspeakers are good and sound. � Make sure none of the signal cables are routed near AC cables, power transformers, or other EMI-inducing devices. � Is there a light dimmer or other SCRbased device on the same AC circuit as the SWA801z? Use an AC line filter or plug the SWA801z into a different AC circuit.

Hum
� Try disconnecting the cable connected to the INPUT jack. If the noise disappears, it could be a �ground loop,� rather than a problem with the SWA801z. 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 linecords into outlets which share a common ground. The distance between the outlets and the common ground should be as short as possible.

Poor bass performance
� Check the polarity of the connections between the mixer and the loudspeakers. You may have your positive and negative connections reversed at one end of one cable, causing one loudspeaker to be out-of-phase. � Try switching the PHASE switch on the rear panel. This affects the polarity between the full-range speakers and the SWA801z and may improve the low-frequency response.

Poor sound
� Is it loud and distorted? Make sure that you�re not overdriving a stage in the signal chain. Verify that all level controls are set properly. � Is the input connector plugged completely into the jack? Be sure all connections are secure. It�s a good idea to periodically clean all electrical connections with a non-lubricating electrical contact cleaner.

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