MACKIE SP1200 - Manual (Page 18)

SP1200 – 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 line-
level 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 SP1200 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 non-
priority 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 SP1200
switches back to the previously selected input
source, fading it in smoothly.
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 SP1200s 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: When using multiple SP1200s
that use the expansion bus, these switch
settings
must be unique to each unit or
you can damage your SP1200(s). Never assign
more than one program source to the same channel
on the Expansion Bus.
EXPANSION IN/OUT
These two 25-pin D-Sub connectors are used to
connect two or more SP1200s 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 11 for information
on wiring these connectors.
These connections allow a common program
source to be available to all the SP1200s 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 SP1200. The music is then
available to Input 1 on all the SP1200s 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 SP1200s 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.
Using the 3-Band EQ
This equalizer is applied to the selected program
source from Inputs 1-4, whether it is a local source
or remote source (via the EXPANSION IN/OUT bus).
This equalizer does not affect the paging mic or
the local MIC/LINE INPUTS, which each have their
own 2-band EQ controls.