Mackie SP2400 Connections, Connecting the Program Sources, Connecting the Microphones

in stereo. The answer to this question will also affect the location of the speakers in the room and the settings for the STEREO/MONO switches for the input sources.

3.How many program sources are going to be used? If the number of program sources is four or less, they can be centralized at one SP2400 and distributed via the Expansion Bus. If there are more than four program sources, they must be distributed among the SP2400s. Determine the number and location of the program sources that are going to be used.

Determine which program sources are going to be used for each zone, and set the LOCAL/REMOTE and internal BUS ASSIGN switches appropriately.

CAUTION: Never assign more than one program source to the same channel on the Expansion Bus.

If there is a requirement for music-on-hold, use Input 1 for the continuous music source (i.e., satellite feed, prerecorded background music, multi- disc CD player). Then use the DIRECT OUTPUT jacks to route the signal to the telephone system.

If there is a jukebox, use Input 4 in Program Priority mode (set the AMP ADDRESS switch #7 UP to activate). When a signal appears at Input 4 it overrides the selected Input source.

Using a chart similar to the one below can be very helpful in organizing the various components of the system:

Zone		SAT	CD	CassetteTunerJukebox
	Source
A	X	X	X	X	X
B	X	X	X	X	X
C		X	X		X
D	X	X			X
E		X	X	X
F	X	X	X		X
G	X	X		X

4.Is there a paging microphone? Is there a requirement for a local microphone for a guest speaker? You must decide where the microphones are going to be located. Avoid placing a microphone near a speaker, to increase gain before feedback. If the mics require phantom power, set the PHANTOM

power switches to the down position for the Paging

Mic and Mic/Line Inputs. Make sure the GAIN +40dB switch is set to the down position as well (+40).

Note: The Paging Mic has priority over the system, including Input 4.

5.Is there a manual switch for paging? Up to three switches can be connected to the SP2400 PAGING MIC CONTROL to manually engage the paging microphone. Otherwise, the paging mic is voice-activated. Adjust the VOX control as described on page 19.

Connections

Connecting the Program Sources

All four Program Inputs use unbalanced RCA connectors. They accept line-level signals (–10 dBV). Each of the Program Inputs is equipped with an AGC circuit instead of input trim controls. These circuits automatically adjust the gain for the best signal-to-noise ratio according to the strength of the input signal. It also ensures that the relative volume level remains the same when switching between input sources.

Use high-quality, two-conductor shielded cable to make these connections.

Connecting the Microphones

If using the XLR input for the paging microphone, wire it per AES standard where pin 1 is ground (shield), pin 2 is signal high (+), and pin 3 is signal low (–). If using the Phoenix-type connector, strip the wire back about 1/4" inch, insert the wire as far as it will go into the appropriate hole in the connector, and tighten down the screw with a small slot-head screwdriver. It is recommended that you use 20 or 22 gauge wire with the Phoenix-type connectors, where pin 1 (the left-most pin) is ground (shield), pin 2 is signal high (+), and pin 3 is signal low (–).

The MIC/LINE INPUT A and B are for a local microphone. This is a Phoenix-type connector, and is wired as described in the previous paragraph for the paging microphone.

All microphone inputs are equipped with a pad switch for use with line-level signals. When connect- ing a line-level signal to these inputs, make sure the GAIN +40dB switches are in the up position.

Connecting the Speakers

The speaker output connectors are two- conductor Phoenix-type, with a position-locking mechanism. Use 16 or 18 gauge wire for connecting the amplifier outputs to the speakers. If

SP2400 – 11