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Front panel features, Rear panel features – MACKIE SP1200 User Manual

Page 4

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SP1200 – 4

Front 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.

Rear Panel Features

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.

SP1200 MUSIC CONTROLLER

INPUTS

OFF

3
0
3
6
9

15
30
55

1

2

3

4

ON

OL

STATUS

POWER

COMM PORT

ZONE A

MASTER

VOLUME