User manual MACKIE SWA2801Z

[. . . ] SWA2801z ACTIVE SUBWOOFER SYSTEM USER'S MAnUAl IMPORTANT SAFETY INSTRUCTIONS 1. Donotblockanyventilationopenings. Installinaccordancewiththe manufacturer'sinstructions. Donotinstallnearanyheatsourcessuchasradiators, heatregisters, stoves, orotherapparatus(includingamplifiers)thatproduceheat. Donotdefeatthesafetypurposeofthepolarizedorgrounding-type plug. Apolarizedplughastwobladeswithonewiderthantheother. [. . . ] If the thermal switch activates frequently, try turning down the level control a notch or two on the mixing console (or other signal source) or on the subwoofer itself to avoid overheating the amplifiers. If the temperature in the room is too high, it could cause the amplifier to overheat. In this case, you should try aiming a fan at the rear panel to move more air across the heatsink panel. SERVICE INFORMATION If you think your Mackie product has a problem, please check out the following troubleshooting tips and do your best to confirm the problem. Visit the Support section of our website (www. mackie. com/support) where you will find lots of useful information such as FAQs, documentation, and user forums. You may find the answer to the problem without having to send your Mackie product away. Troubleshooting No power · Our favorite question: Is it plugged in?If you suspect the AC line fuse is blown, please see the "Repair" section on page 9. THERMAL CONSIDERATIONS The SWA801z has a powerful amplifier built-in. As amplifiers produce heat, it is important to dissipate the heat as quickly as possible. This results in increased reliability and longevity for the amplifier. The amplifier module is mounted on a large heatsink, which is cooled by convection where cool air is drawn through it's fins, carrying the heat away. In order for this convection cooling to work efficiently, it is important to provide adequate airspace behind the loudspeaker. When you position the SWA801z, we recommend leaving at least six inches of air space behind it. In the unlikely event of the amplifier overheating, a built-in thermal switch will activate, which mutes the signal. When the amplifier has cooled down to a safe operating temperature, the thermal switch resets itself, and the SWA801z resumes normal operation. 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. 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. 7 · 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. Make sure there is at least six inches of free space behind the SWA801z. 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. [. . . ] The return ground shipment is covered for those units deemed by us to be under warranty. Note: You must have a sales receipt from an authorized Mackie dealer for your unit to be considered for warranty repair. IMPORTANT: Make sure that the Service Request Number is plainly written on the shipping carton. LOUD Technologies reserves the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out. [. . . ]