Mackie SR1530 Owner's Manual - Page 5

CONNECTIONS The SR1530 has one female XLR input that accepts a balanced line-level signal. When connecting a balanced signal, be sure it's wired per AES (Audio Engineering So- ciety) standards: XLR Hot (+) Pin 2 Cold (-) Pin 3 Shield (Ground) Pin 1 There is also a male XLR connector labeled LOOP OUT. This is also wired according to the above AES standard. You can create a horizontal array by placing the cabinets side-by-side. However, you should have a good understanding of the relationship between the splay angle (the angle between the facing sides of the cabinets), the on-axis power, and frequency cancellation effects between cabinets. When two cabinets are placed side-by-side, the actual splay angle is 20º (determined by a 10º angle on each cabinet side). As the splay angle increases toward the angle of horizontal coverage (90º for the SR1530), the on-axis power decreases, but the frequency response becomes smoother as the comb-filtering effects (caused by the interaction in the area of double-coverage) decrease. 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. Balanced XLR Connectors The LOOP OUT connector allows you to connect more than one SR1530 to your system. Simply plug the signal source (i.e., mixer output) into the first MAIN INPUT jack, and patch that speaker's LOOP OUT jack to the next MAIN INPUT jack, and so on, daisy-chaining multiple speakers. The LOOP OUT jack is wired straight from the MAIN INPUT connector - there is no electronic circuitry between - so the signal coming out of the LOOP OUT jack is exactly the same as the signal going in. PLACEMENT The SR1530 speaker is designed to sit on the floor or stage. WARNING: The cabinet has no rigging points and is not suitable for rigging. NEVER attempt to suspend the SR1530 by its handles. The SR1530 should never be pole-mounted. AC POWER Be sure the SR1530 is plugged into an outlet that is able to supply the correct voltage specified for your model. If the voltage should drop below 97% of the specified line voltage, the built-in amplifiers will no longer be able to supply rated power. (They will continue to operate down to 80% of the rated line voltage, but won't reach full power, resulting in lower headroom.) Be sure the electrical service can supply enough amperage for all the components connected to it. We recommend that a stiff (robust) supply of AC power be used because the amplifiers place high current demands on the AC line. The more power that is available on the line, the louder the speakers will play and the more peak output power will be available for cleaner, punchier bass. A suspected problem of "poor bass performance" is often caused by a weak AC supply to the amplifiers. Never remove the ground pin on the power cord of the SR1530 or any other component. This is very dangerous. 5