Mackie Sound Palette Series SP2400 Instruction Manual page 5

MIC/LINE INPUT is provided to connect a local
microphone in each zone. This is a 3-pin Phoenix-
type connector where pin 1 is ground, pin 2 is signal
high (+), and pin 3 is signal low (–).
AMBIENT MIC is a 3-pin Phoenix-type connector
used to connect the optional MT-3100 ambient
microphone, one for each zone. This microphone is
used to detect the ambient noise level in the room.
The microprocessor uses this information to adjust
the paging mic level above the ambient noise. The
ambient mic also provides an input for the optional
DSP card when it is installed.
EQ is a 3-band equalizer with a sweepable
midrange that only affects Inputs 1-4. LOW is a
shelving filter that provides 15 dB of boost and cut
below 80Hz. MID is a peaking filter that provides
15 dB of boost and cut at the selected frequency
between 250Hz and 8kHz. HIGH is a shelving filter
that provides 15 dB of boost and cut above 12kHz.
AMP ADDRESS is used to assign a unique
address to each amplifier, as well as to enable or
disable features. Switches 1-5 provide 32 separate
addresses, switch 6 determines Master/Slave
status, switch 7 enables Input 4 Priority, and switch
8 enables the optional ambient mic. Any two
amplifiers assigned to the same address can be
controlled by a single remote control when
connected together via the RS485 ports.
RS485 is a 3-pin Phoenix-type connector in each
zone that provides an interface for the SPLinker
Sound Palette Control PC application software for
centralized computer control of up to 32 zones, as
well as communication between SP2400s.
The RS485 interface is internally connected
between the two amplifiers, so if both amplifiers are
assigned the same zone with the AMP ADDRESS
switch, the front panel controls and remote controls
operate both sides, ideal for stereo operation.
REMOTE is a 3-pin Phoenix-type connector for
the optional wired remote control (SP-41R), which
provides Input Select and Master Volume control.
EXPANSION IN/OUT consists of two parallel 25-
pin D-Sub connectors for connecting multiple
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SP2400
MUSIC CONTROLLER
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SP2400s together in a serial fashion. Any of the four
program sources from any SP2400 can be used as
the source for any of the zones in the system by
assigning it to the expansion bus with the internal
Bus Assign switches. This is a balanced bus for the
four stereo input sources. In addition, the paging
mic and paging control signal are also provided on
the EXPANSION bus.
LOCAL/REMOTE is a set of eight DIP switches
used to select the input source for the channel.
Each program input has two switches, one to select
the left signal source (odd-numbered switches) and
one to select the right signal source (even-
numbered switches). Move the switches up to
select the local program source, and down to select
the remote (external) program source from the
EXPANSION bus.
STEREO/MONO switches configure each input
source for either stereo or mono operation. If the
SP2400 is being used in a stereo configuration,
leave the switches up. If it's being used in a zone
configuration, move the switches down to combine
the left and right channels for mono operation.
PRE OUT is an unbalanced RCA jack that
provides a line-level signal from the preamplifier
stage of the SP2400. This provides a method for
inserting an external signal processor into the signal
chain prior to the amplifier stage. The U-shaped
jumper wire should remain installed between the
PRE OUT and AMP IN jacks for normal operation.
AMP IN is an unbalanced RCA jack that accepts
a line-level signal. See PRE OUT above.
ZONE A/ZONE B OUTPUTS are 2-pin Phoenix-
type connectors that provide speaker-level signals.
The SP2400 is shipped with the outputs configured
for 70-volt operation in U.S. versions, and 100-volt
operation in European versions. Internal jumpers are
provided to configure the amplifier for 8 ohm
systems as well. See page 14 for more information.
Connect the supplied AC linecord to the IEC AC
Socket. The AC line fuse is contained in the socket,
behind the cover located at the bottom of the
socket. Use replacement fuses only as indicated on
the rear panel.
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SP2400 – 5