Mackie SP1200 user service Front Panel Features, Rear Panel Features

Front Panel Features Rear Panel Features

INPUTS select buttons are used to choose the program source for the zone. Only one source may be selected at a time. These are non-priority inputs. However, Input 4 can become a Program Priority Input by setting the AMP ADDRESS switch #7 UP. In this mode, when a signal is present on Input 4, it automatically overrides whatever input source is selected for that zone. This is useful for jukeboxes or alternative paging configurations.

INPUT OFF deselects Inputs 1-4 and activates the MIC/LINE INPUT .

MASTER VOLUME is used to adjust the overall volume level for Inputs 1-4.

When OFF is selected, the Up/Down MASTER VOLUME buttons adjust the output level for the MIC/LINE INPUT . The Master Volume setting for Inputs 1-4 is retained in memory, and is recalled when a program source is selected.

The Meter indicates the level at the PRE OUT

jack. Normally, it operates as a peak program meter (PPM). When adjusting the MASTER VOLUME level, the meter changes from level indication to level setting indication. After five seconds, the meters switch back to normal peak program metering.

There are two STATUS indicators. The OVERLOAD LED indicates when the amplifier is beginning to current limit. The ON LED indicates when the SP1200 is operating.

The COMM PORT is used to connect to the optional DSP card with a Palm™ Handheld or PC- compatible laptop computer for configuration.

Turning the POWER switch on activates the soft- start circuit in the power supply. The soft-start circuit impedes in-rush current from the AC supply.

PROGRAM INPUTS 1-4 are stereo RCA unbalanced inputs that accept line-level signals.

The LOCAL/REMOTE switches on the rear panel select either the local program input signal connected here or the program signal on the expansion bus. See "EXPANSION IN/OUT" on page 18 for more information.

Note: The SP1200 combines the left and right input signals into mono after the expansion bus I/O.

DIRECT OUTPUT is a buffered line-level output providing the stereo signal from the program source connected to INPUT 1. Signal is always present at the DIRECT OUTPUT, regardless of whether INPUT 1 is selected as the source. This is useful for music- on-hold and other external applications.

PAGING MIC is the connection for the paging microphone. There are two connectors available: a 3-pin XLR and a 3-pin Phoenix-type connector. In both cases, pin 1 is ground, pin 2 is signal high (+), and pin 3 is signal low (–).

CONTROL is a Phoenix-type connector for connecting external normally-open switches for remote paging. Two options are available: page to Zone A, and page to the entire system (ALL CALL). Connect the switches between GROUND and the option of choice.

PHANTOM applies phantom power (+24V DC) to pins 2 and 3 of the microphone input. Move both switches to the down position to turn on phantom power.

The GAIN +40 dB DIP switch is used to set the gain for use with either a mic-level or a line-level signal. Move both switches to the down position for mic-level signals, and up for line-level signals.

The GAIN variable control is used to trim the mic preamp gain for the best signal-to-noise ratio.

The LOW variable control is a shelving filter that provides 12 dB of boost and cut below 100Hz.

The HIGH variable control is a shelving filter that provides 12 dB of boost and cut above 12kHz.

ZONE A

INPUTS

MASTER

VOLUME

3

0

3

6

9

15

30

55

SP1200 MUSIC CONTROLLER

1 2 3 4

OFF

OL ON

STATUS

COMM PORT POWER

SP1200 – 4