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Crown IQ SYSYEM MPX-6TM Product Reference

Mixer-router

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®
120 VAC
AUX
60 Hz
CTRL
20 W
RS232 / RS422 / PA422
OVERVIEW
What is an MPX-6?
The MPX-6 is a single rack space five
by one automatic mixer designed to be
configured with a computer and appro-
priate software. Once initially setup the
computer becomes optional. The key to
the MPX-6 operating as a stand alone
mixer is distributed intelligence
IQ System the brains of the system live
out in the system. This means the audio
system is not going to be lost even if the
computer or communication cables fail.
The MPX-6 is an ideal choice for appli-
cations where computerized manual
mixing or routing is desired and the au-
tomation of the SMX-6 or AMB-5 auto-
matic mixers is not required.
HARDWARE BLOCK DIAGRAM
Refer to the pictures of the front and rear
panels shown above and the block dia-
gram of the MPX-6 mixer on Page 2.
Audio Main Inputs:
Six balanced inputs with removable 3
pin barrier block. The preamp stage in-
cludes:
• M/L/P switches
set each input to
line level (L) with 0
dB gain, mic level
(M) with 25 dB ad-
ditional gain, or
phantom (P) which is 25 dB addi-
tional gain and +44 VDC phantom
power.
• A trim pot at each input allows for
prefade gain adjustment of –12 dB
to +21 dB gain after the M/L/P
switch.
There are two VCAs under processor
control at the output of each preamp.
One VCA controls the gain from input to
output mix 1 and the other VCA controls
gain from the input to output mix 2. The
net result is 12VCAs total.
®
Product Reference
MPX-6
CROWN
BUS
AUDIO
AUDIO
STACK
STACK
IN
IN
OUT
OUT
SERIAL DATA LOOP
2
1
IN
OUT
IN
+ – + –
MAIN
BUS
MAIN
INPUT
+
+
+
+
GROUND
ONLY
MPX-6 COMPUTER CONTROLLED MIXER-ROUTER
(Front Panel shown above, Rear Panel shown below)
Audio Stack Inputs:
Two inputs, one per output mix. Connec-
tions are via unbalanced RCA phono
jacks. These inputs are op-amp isolated.
There is no processor control of audio
coming into these inputs. The purpose
of the stack inputs is to allow construc-
tion of a wide mixer with more than six
. In an
inputs by taking the outputs of one mixer
and going into the stack inputs of a sec-
ond mixer. This means that main inputs
do not have to be used to expand the
effective size of the overall mixer.
Audio Main Outputs:
There are two summing
buses. Each summing
bus provides the out-
put mix for the corre-
sponding output chan-
nel. Op-amps buffer
the summing bus to the
output connection and balance the au-
dio output. The outputs are via 3 pin re-
movable barrier blocks.
Audio Bus Outputs:
In addition to the two main outputs, there
are also two bus outputs. Bus outputs 1
and 2 provide the same audio output as
AUDIO
ADD 25
0
5
FOR MIC
IN
main outputs 1 and 2. Op-amps buffer
-5
10
1
-10
15
the summing bus to the output connec-
-12
21
tion and balance the audio output. What
M
L
P
makes the Bus Outputs different are re-
+
lays under processor control which may
be used to turn on or off the Bus Output
drive. 3 Pin removable barrier blocks are
used.
Aux Port:
The unit is equipped with a TB-3M type
mini-XLR port. This port may be used to
provide a control signal or sense a con-
trol signal. Pin 1 is ground reference. Pin
2 is output under processor control.
When on it provides 10 VDC at 16 ma.
When off it is open collector (high im-
pedance). Pin 3 is sensing input. +5 to
MPX-6 Mixer (Page 1 of 3)
Mixer-Router
DSPI
AUDIO
AUDIO
AUDIO
ADD 25
ADD 25
0
0
5
FOR MIC
5
FOR MIC
IN
IN
IN
-5
-5
-5
10
10
6
5
4
-10
-10
-10
15
15
BUS
-12
21
-12
21
-12
M
L
P
M
L
P
+
+
+
AUDIO
STACK
IN
OUT
1
MAIN
BUS
+
+
ENABLE
AUDIO
AUDIO
AUDIO
ADD 25
ADD 25
ADD 25
0
0
0
5
FOR MIC
5
FOR MIC
5
FOR MIC
IN
IN
IN
-5
-5
10
10
10
3
2
1
-10
-10
15
15
15
21
-12
21
-12
21
M
L
P
M
L
P
M
L
P
+
+
+
+30 VDC is sensed as a logic high. The
circuit floats, therefor tie to ground or TTL
source for definite high or low.
Indicators:
A Power light on the front panel indicates
the unit is powered. A DSPI data signal
presence indicator indicates communi-
cation.
Crown Bus Port:
The Crown Bus is a serial data loop
where components are connected into
the loop and one component serves as
system interface for all. This unit may
serve as a system interface or may sim-
ply operate as a component on a Crown
Bus data loop. Although the Crown Bus
may function on a variety of media,
Crown uses a two-wire 20 ma current
loop for input and output Crown Bus
connections. On this unit connections
are made via 4 pin removable barrier
block. Even if the unit is communicating
directly with a PC via its serial port, it
always functions in software as an ad-
dressable component on a Crown Bus
loop. The unit must have a valid loop
address. A valid address is:
• 1 to 250 set via 8 segment DIP
switch
• No other MPX on the same Crown
Bus data loop may have the same
address.
The Crown Bus is asynchronous with 8
data bits, 1 start bit, 1 stop bit, no par-
ity, and operates at 38400 baud. The
MPX is not a U-Code protocol compo-
nent.
Serial Port:
The serial port on this unit is a female
25 pin D-Shell. RS232 and RS422 are
supported with 8 Data bits, 1 start bit, 1
stop bit, no parity. Up to 19200 baud
supported. The serial port for the AMB
may be used for direct communication
with a PC such that the AMB serves as
interface:
ADD 25
0
5
FOR MIC
-5
10
-10
15
-12
21
M
L
P

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Summary of Contents for Crown IQ SYSYEM MPX-6TM

  • Page 1 A DSPI data signal presence indicator indicates communi- cation. Crown Bus Port: The Crown Bus is a serial data loop where components are connected into the loop and one component serves as system interface for all. This unit may...
  • Page 2 BALANCED RELAY BUCHANAN CONNECTOR BUS 2 OUTPUT TO BUS VCAs RELAYS RS232/RS422 DB25 CROWN BUS 4-PIN BUCHANAN COMMUNICATION STANDARD BAUD RATE & PARITY 1 2 3 4 5 6 IQ ADDRESS 1 2 3 4 5 6 7 8 3-PIN...
  • Page 3 The computer is connected to the IQ System interface via RS232. The inter- face converts the protocol from RS232 to Crown Bus media and back again. In a small system or a single MPX system the MPX itself may serve as the system interface.

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