Mackie SP2400 Instruction Manual - All - Page 18

Using INPUTS 1-4 Connect the program sources to Inputs 1-4. These could include a CD player, tape deck, tuner, satellite feed, TV audio, jukebox, or an audio feed from a live band. All four program inputs use unbalanced RCA connectors and accept stereo linelevel signals. Note: The Input Select buttons are labeled 1 through 4 on the front panel. The spaces below the buttons are sized to accept 1/4" labels from the Brother P-Touch Electronic Labeling System. Professional-looking labels can be made to clearly identify the program source connected to each input (visit www.brother.com). There are no individual volume controls for Inputs 1-4. The SP2400 automatically adjusts the volume for each input using an AGC circuit (Automatic Gain Control). This provides the best signal-to-noise ratio and insures that the volume remains the same when you switch from one source to another. Only one Input source can be selected at a time. When switching from one source to another, the previous source fades out while the new source fades in (digital crossfade), rather than abruptly switching between the two. INPUT 1 and the Direct OUTPUT Input 1 provides a direct line-level output that can be used for music-on-hold or other external applications. Connect a continuous music source (i.e., satellite feed, prerecorded background music, multi-disc CD player) to Input 1 and connect the DIRECT OUTPUT jacks to the external destination. INPUT 4 Priority Normally, the four program inputs are nonpriority inputs. However, if there is a jukebox or other priority program source in the system, Program Priority can be activated on Input 4 by setting AMP ADDRESS switch #7 UP. When a signal appears at Input 4, it overrides the other three inputs. When the signal stops, the SP2400 switches back to the previously selected input source, fading it in smoothly. STEREO or MONO The four program inputs accept stereo signals. The SP2400 can be operated in a stereo configuration or a zone configuration. The STEREO/MONO switches should be set to the up position for stereo operation. Set the AMP ADDRESS switches to the same address to allow the front panel and remote control panels to operate both amplifiers. In a zone configuration, move the STEREO/ MONO switches down to combine the stereo signal into a mono signal for each program source. Set the AMP ADDRESS switches to different addresses to allow independent control over each zone. LOCAL or REMOTE These switches are used to select the input source for each of the four Program Inputs. Leave the switches up to select the local input source connected to the PROGRAM INPUT connector. Move the switches down to select the remote signal coming from the EXPANSION IN connector. Each Program Input has two switches, one for the left input and one for the right input. Bus Assign These internal switches are used if you have two or more SP2400s connected together in a system using the EXPANSION IN/OUT connectors. Each of the four program inputs can be individually assigned to the EXPANSION balanced bus. There are four switches associated with each Program Input source (see the Bus Assign Switch chart on page 13). Caution: Never assign more than one program source to each of the four expansion bus outputs. EXPANSION IN/OUT These two 25-pin D-Sub connectors are used to connect two or more SP2400s together so they can share program sources. This is a true balanced bus and transmits the left and right signal from each of the four inputs over balanced lines. Refer to the "Connections" section on page 12 for information on wiring these connectors. These connections allow a common program source to be available to all the SP2400s in a system. For example, prerecorded music that is used for music-on-hold can also serve as background music for an entire office building by setting the internal bus assign switches for Input 1 to the up position on the first SP2400. The music is then available to Input 1 on all the SP2400s connected via the EXPANSION IN/OUT connectors when their LOCAL/REMOTE switches are set to the REMOTE position (down). Note: Switching the LOCAL/REMOTE switch to REMOTE doesn't disconnect the local input. If a different program source is connected locally to Input 1 on one of the SP2400s in the above example, both the common program source (the remote prerecorded music) and the local program source will be combined on Input 1 and can be played simultaneously. Typically, a local program source would not be connected to an Input which has REMOTE selected as the source. SP2400 - 18