User manual MACKIE SRM350

[. . . ] SRM350 2-WAY ACTIVE LOUDSPEAKER USER'S MANUAL CAUTION AVIS 9. Power Sources -- This Mackie product should be connected to a power supply only of the type described in these operation instructions or as marked on this Mackie product. Power Cord Protection -- Power supply cords should be routed so that they are not likely to be walked upon or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit this Mackie product. Object and Liquid Entry -- Care should be taken so that objects do not fall into and liquids are not spilled into this Mackie product. [. . . ] This, too, increases the low-frequency output, though not as much as corner placement. However, if you do need to reinforce the low frequencies, this is a good way to do it. · Avoid placing the active speakers directly on a hollow stage floor. A hollow stage can resonate at certain frequencies, causing peaks and dips in the frequency response of the room. It's better to place the active speakers on a sturdy table or tripod stands. · Position the active speakers so the highfrequency drivers are 2 to 4 feet above ear level for the audience (make allowances for a standing/dancing in the aisles audience). High frequencies are highly directional and tend to be absorbed much easier than lower frequencies. By providing direct line-of-sight from the active speakers to the audience, you increase the overall brightness and intelligibility of the sound system. · Highly reverberant rooms, like many gymnasiums and auditoriums, are a nightmare for sound system intelligibility. Multiple reflections off the hard walls, ceiling, and floor play havoc with the sound. 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). RIGGING The SRM350 cabinets are fitted with four M5 insert points on the top and bottom for installing an optional accessory plate that allows the speaker to be flown. WARNING: Never attempt to suspend the SRM350 active speakers by their handles. If you want to suspend them, use the accessory plate only. M5 inserts for mounting rigging accessory plate Top Pole Mount Bottom If you are hanging them in an inaccessable place, such as over a lion's cage, make sure that you first complete the sound check and set the SRM350 LEVEL correctly. 11 THERMAL CONSIDERATIONS The amplifiers inside the SRM350 are convection cooled by a large heatsink. For efficient cooling, it is important to allow at least six inches of free space behind the SRM350. If the ambient temperature in the room is high, it could cause the amplifiers to overheat. In this case, you should try aiming a fan at the heatsink to increase the air flow through the fins. [. . . ] If you bring your loudspeaker to an Authorized Service Center and they can't find anything wrong with it, you may be charged a service fee. If the Authorized Mackie Service Center is located in another city, pack the loudspeaker in its original shipping carton. More information on packing can be found in the Service section of this manual. Contact the Authorized Mackie Service Center to arrange service or bring the loudspeaker to them. [. . . ]