User manual MACKIE SRM450V2

[. . . ] SRM450v2 Active Sound ReinfoRceMent SPeAKeR uSeR'S MAnuAl IMPORTANT SAFETY INSTRUCTIONS 1. Donotblockanyventilationopenings. Installinaccordancewiththe manufacturer'sinstructions. Donotinstallnearanyheatsourcessuchasradiators, heatregisters, stoves, orotherapparatus(includingamplifiers)thatproduceheat. Donotdefeatthesafetypurposeofthepolarizedorgrounding-type plug. Apolarizedplughastwobladeswithonewiderthantheother. [. . . ] This allows you to connect more than one SRM50v to the output of your mixing console. Simply plug the signal source output into the first INPUT jack, and patch that speaker's THRU jack to the next INPUT jack, and so on, daisy-chaining multiple speakers (see diagram on page 6). There is a limit to how many you can daisy-chain together. 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 10 ohms, then you can daisy chain up to sixteen SRM50vs. This is a load of 150 ohms (SRM50v input impedance=0 kohms; 16 of these in parallel=150 ohms). Since microphones typically have a higher output impedance, you should limit daisy-chaining from a mic source to two SRM50vs (see the diagram on page 7). The THRU jack is wired straight from the INPUT connector -- there is no electronic circuitry between -- so the signal coming out of the THRU jack is exactly the same as the signal going in. PLACEMENT The SRM50v active speakers are designed to sit on the floor, a tabletop, or to fit on a standard tripod speaker stand. They can also be suspended by the rigging points, shown opposite. You can lay the cabinet down on its side and use the SRM50v as a floor monitor. The asymmetrical trapezoidal shape of the cabinet provides a perfect angle for aiming up toward performers from the front of the stage. When used for monitor applications, we recommend engaging the LOW CUT filter. As with any powered components, protect them from moisture. If you are setting them up outdoors, make sure they are under cover if you expect rain. Do not place it closer than two feet (0. 6 meters) from any TV set or computer monitor. Check the screen for any change in color or distortion. Do not place any magnetic audio or video tapes or computer discs near the SRM50s. Room Acoustics The SRM50v active speakers are designed to sound as neutral as possible; that is, to reproduce the input signal as accurately as possible, monitoring the sound rather than changing it. Room acoustics play a crucial role in the overall performance of a sound system. However, the wide highfrequency dispersion of the SRM50v helps to minimize the problems that typically arise. Balanced XLR Connectors Top 900 900 Dispersion up to 20 kHz 10 RIGGING Here are some other placement tips: · Avoid placing loudspeakers in the corners of a room. This increases the low-frequency output and can cause the sound to be muddy and indistinct. · Avoid placing loudspeakers against a wall. This, too, increases the low frequency output, though not as much as corner placement. [. . . ] If they are set up outdoors, be sure they are under cover if you expect rain or you live in Washington. · Avoid exposure to extreme cold (below freezing temperatures). If you must operate the loudspeakers in a cold environment, warm up the voice coils slowly by sending a low-level signal through them for about 15 minutes prior to high-power operation. · Use a dry cloth to clean the cabinets. [. . . ]