Mackie SP2400 Instruction Manual - All - Page 21

Press the OFF button to select the MIC/LINE INPUT. Adjust the MASTER VOLUME control by pressing the up/down buttons so the meter indicates a level at the "0" mark. With all music sources off, speak into the mic with a normal voice. Adjust the MIC/LINE INPUT GAIN control with a non-conductive alignment tool so that the meter indication is near the "0" mark. This provides the best signal-to-noise ratio for the mic and insures that its relative volume will be equivalent to the program sources. Distributed Speaker System When using the SP2400 in a 70V or 100V system, connect the speaker outputs directly to the distributed system. The SP2400 can directly drive a distributed system's speaker line without the need for an output transformer. The SP2400 can supply up to 200 watts into a 70V or 100V distributed system. Make sure the taps on the speakers in the system do not exceed a total of 200 watts. Using the REMOTE Connection Using the EQ Each local MIC/LINE INPUT has a 2-band equalizer for adjusting the lows or highs on the microphone signal. When the controls are set to "U" (unity), the EQ has no effect on the signal. The optional SP2400 Remote Control (SP-41R) provides Input Selection and Master Volume control for each amplifier or zone. The Remote Control can be mounted in a standard double-gang electrical box and covered with a Decora®-style faceplate. Using the PRE OUT/AMP IN Connections The PRE OUT and AMP IN connectors are provided to give you more flexibility in your system design. The SP2400 is shipped with U-shaped jumpers installed between the PRE OUT and AMP IN jacks. This routes the signal from the output of the preamplifier stage to the input of the amplifier stage. This also provides a point in the signal chain to insert an external signal processor. Simply connect the line-level signal from the PRE OUT jack to the input of the processor, and connect the line-level output from the processor to the AMP IN jack on the SP2400. Another option that is available is to connect another amplifier into the system. Simply use a Y-cord at the PRE OUT jack to split the signal between the AMP IN jack and the input jack on an external amplifier. LEFT and RIGHT OUTPUTs The amplifier outputs on the SP2400 can be used with an 8-ohm impedance load, or to directly drive a 70V or 100V distributed system (also called constant-voltage systems). Direct Speaker Connection If the SP2400 is not being used in a distributed speaker system, you can reconfigure the amplifiers to drive an 8-ohm load. Each amplifier can provide up to 250 watts into an 8-ohm load. See the "Internal Settings" section on page 14 for instructions on how to reconfigure the amplifiers. 3 0 3 6 9 15 30 55 Connecting One or More Remote Controls Each Remote Control affects only the zone to which it is connected. Up to ten remote controls may be connected to each zone simultaneously. This allows controls to be conveniently placed. Each control will interact with the SP2400, and all controls will reflect the current source and level settings. Note that the remote control indicates the gain setting and not the actual signal level in real time. In addition, the SP2400 provides a method for controlling two independent zones using a single Remote Control by assigning them to the same AMP ADDRESS (see next section). The maximum distance between the remotes and the SP2400 varies, depending on the type of cable selected and the number of remote controls used. Typically, a lower wire gauge and cable capacitance allow longer distances. See the instructions with the remote control for more information. SP2400 - 21