User manual MACKIE HD1521

[. . . ] HD1521 2-Way High-Definition Powered Loudspeaker OWNER'S MANUAL HD1521 ImportantSafetyInstructions 1. Donotblockanyventilationopenings. Installinaccordancewiththe manufacturer'sinstructions. Donotinstallnearanyheatsourcessuchasradiators, heatregisters, stoves, orotherapparatus(includingamplifiers)thatproduceheat. Donotdefeatthesafetypurposeofthepolarizedorgrounding-type plug. Apolarizedplughastwobladeswithonewiderthantheother. [. . . ] Depending on the situation, you may be able to take some steps to minimize the reflections, such as putting carpeting on the floors, closing draperies to cover large glass windows, or hanging tapestries or other materials on the walls to absorb some of the sound. Making the sound system louder generally doesn't work because the reflections become louder, too. The best approach is to provide as much direct sound coverage to the audience as possible. The farther away you are from the speaker, the more prominent will be the reflected sound. Use more speakers strategically placed so they are closer to the back of the audience. If the distance between the front and back speakers is more than about 100 feet, you should use a delay processor to time-align the sound. (Since sound travels about 1 foot per millisecond, it takes about 1/10 of a second to travel 100 feet. ) Owner's Manual · · · · Room Acoustics The HD1521 loudspeakers are designed to sound neutral; that is, to reproduce the input signal as accurately as possible. Room acoustics play a crucial role in the overall performance of a sound system. Here are some additional placement tips to help overcome some typical room problems that might arise: Keep in mind that the Contour EQ is a great way to compensate for some of these issues. Owner's Manual HD1521 Rigging HD1521s may be individually flown horizontally or vertically using M10 X 1. 5 X 37 mm forged shoulder eyebolts. WARNING: Installation should only be done by an experienced technician. Improper installation may result in damage to the equipment, injury or death. Make sure that the loudspeaker is installed in a stable and secure way in order to avoid any conditions that may be dangerous for persons or structures. NEVER attempt to suspend the HD1521 by its handles. RiggingDesignPractices Rigging a loudspeaker requires determining: 1. The rigging methods and hardware that meet static, shock, dynamic, and any other load requirements for supporting the loudspeaker from structure. The design factor for and the required WLL (Working Load Limit) for this support. Documentation: Thoroughly document the design with detailed drawings and parts lists. Analysis: Have a qualified professional, such as a licensed Professional Engineer, review and approve the design before its implementation. Installation: Have a qualified professional rigger do the installation and inspection. Safety: Use adequate safety precautions and backup systems. 1 Fly Points MP MP MP MP=Mounting Point MP MP MP MP MP MP MP MP Two per side Two on the rear Three each on the top and bottom Flown Horizontally Rear Fly Points (adjust angle) Top Fly Points Flown Vertically Side Fly Points Lower Rear Fly Point (adjusts angle) HD151 RiggingHardwareandAccessories Rigging Mackie loudspeakers will invariably require hardware not supplied by Mackie. Various types of loadrated hardware are available from a variety of thirdparty sources. There are a number of such companies specializing in manufacturing hardware for, designing, and installing rigging systems. Because of the hazardous nature of rigging work and the potential liability, engage companies that specialize in these disciplines to do the work required. [. . . ] When connecting a balanced signal, be sure it's wired per AES (Audio Engineering Society) standards: XLR Hot (+) Pin 2 Cold (­)Pin 3 Shield (Ground) Pin 1 Owner's Manual Balanced XLR Connectors There is also a male XLR connector on the HD1521 labeled loop out. Simply plug the signal source (i. e. , mixer output) into the input jack, and patch that speaker's loop out jack to the next speaker's input jack, and so on, daisy-chaining multiple speakers. A general rule is to maintain a load impedance ten times or more than the source impedance to prevent excessive loading on the source. For example, if your mixer has an output impedance of 120 ohms, then you can daisy chain up to nine HD1521s. [. . . ]