®
@crown® * System Product Reference
™
MPX-6 Mixer-Router
DSPI
ENABLE
CROWN
SERIAL DATA LOOP
BUS
STACK
IN
STACK
IN
AUDIO
OUT
AUDIO
OUT
AUDIO
AUDIO
IN
AUDIO
IN
AUDIO
IN
AUDIO
AUDIO
IN
-5
ADD 25
ADD 25
ADD 25
ADD 25
ADD 25
ADD 25
120 VAC
60 Hz
AUX
CTRL
0
0
0
0
0
0
5
5
5
5
5
5
FOR MIC
FOR MIC
FOR MIC
FOR MIC
FOR MIC
FOR MIC
IN
IN
-5
-5
-5
-5
-5
10
10
10
10
10
10
-10
-10
-10
-10
-10
-10
15
21
15
21
15
21
15
21
15
21
15
21
IN
OUT
IN
+
2
1 MAIN
6
5
4
3
2
1
-12
-12
-12
-12
-12
-12
+
–
–
MAIN
BUS
BUS
M
L
P
M
L
P
M
L
P
M
L
P
M
L
P
M
L
P
INPUT
GROUND
ONLY
RS232 / RS422 / PA422
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
MPX-6COMPUTERCONTROLLEDMIXER-ROUTER
(FrontPanelshownabove,RearPanelshownbelow)
OVERVIEW
Audio Stack Inputs:
+30 VDC is sensed as a logic high. The
Two inputs, one per output mix. Connec- circuit floats, therefor tie to ground or TTL
What is an MPX-6?
The MPX-6 is a single rack space five tions are via unbalanced RCA phono source for definite high or low.
by one automatic mixer designed to be jacks. These inputs are op-ampisolated. Indicators:
configured with a computer and appro- There is no processor control of audio A Power light on the front panel indicates
priate software. Once initially setup the coming into these inputs. The purpose the unit is powered. A DSPI data signal
computer becomes optional. The key to of the stack inputs is to allow construc- presence indicator indicates communi-
the MPX-6 operating as a stand alone tion of a wide mixer with more than six cation.
™
mixer is distributed intelligence . In an inputs by taking the outputs of one mixer Crown Bus Port:
IQ System the brains of the system live and going into the stack inputs of a sec- The Crown Bus is a serial data loop
out in the system. This means the audio ond mixer. This means that main inputs where components are connected into
system is not going to be lost even if the do not have to be used to expand the the loop and one component serves as
computer or communication cables fail. effective size of the overall mixer.
The MPX-6 is an ideal choice for appli- Audio Main Outputs:
cations where computerized manual There are twosumming
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
STACK
IN
AUDIO
OUT
mixing or routing is desired and the au- buses. Each summing
tomation of the SMX-6 or AMB-5 auto- bus provides the out-
1 MAIN
BUS
matic mixers is not required.
put mix for the corre-
sponding output chan-
nel. Op-amps buffer
+
–
+
–
HARDWARE BLOCK DIAGRAM
Refer to the pictures of the front and rear the summing bus to the
panels shown above and the block dia- output connection and balance the au- block. Even if the unit is communicating
gram of the MPX-6 mixer on Page 2.
Audio Main Inputs:
Six balanced inputs with removable 3 Audio Bus Outputs:
dio output. The outputs are via 3 pin re- directly with a PC via its serial port, it
movable barrier blocks.
always functions in software as an ad-
dressable component on a Crown Bus
pin barrier block. The preamp stage in- In addition to the two main outputs, there loop. The unit must have a valid loop
cludes: are also two bus outputs. Bus outputs 1 address. A valid address is:
• M/L/P switches
and 2 provide thesame audio output as
main outputs 1 and 2. Op-amps buffer
the summing bus to the output connec-
tion andbalance the audio output. What
makes the Bus Outputs different are re-
• 1 to 250 set via 8 segment DIP
switch
• No other MPX on the same Crown
Bus data loop may have the same
address.
AUDIO
IN
ADD 25
0
5
FOR MIC
-5
10
set each input to
line level (L) with 0
dB gain, mic level
(M) with 25 dB ad-
ditional gain, or
-10
15
21
1
-12
M
L
P
+
–
lays under processor control which may The Crown Bus is asynchronous with 8
phantom (P) which is 25 dB addi- be used to turn on or off the Bus Output data bits, 1 start bit, 1 stop bit, no par-
tional gain and +44 VDC phantom drive. 3 Pin removable barrier blocks are ity, and operates at 38400 baud. The
power.
used.
MPX is not a U-Code protocol compo-
nent.
• A trim pot at each input allows for Aux Port:
prefade gain adjustment of –12 dB The unit is equipped with a TB-3M type Serial Port:
to +21 dB gain after the M/L/P mini-XLR port. This port may be used to The serial port on this unit is a female
switch.
provide a control signal or sense a con- 25 pin D-Shell. RS232 and RS422 are
There are two VCAs under processor trol signal. Pin 1 isground reference. Pin supported with 8 Data bits, 1 start bit, 1
control at the output of each preamp. 2 is output under processor control. stop bit, no parity. Up to 19200 baud
One VCA controls the gain from input to When on it provides 10 VDC at 16 ma. supported. The serial port for the AMB
output mix 1 and the other VCA controls When off it is open collector (high im- may be used for direct communication
gain from the input to output mix 2. The pedance). Pin 3 is sensing input. +5 to with a PC such that the AMB serves as
net result is 12VCAs total.
interface:
MPX-6 Mixer (Page 1 of 3)
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®
@crown® * System Product Reference
MPX-6 Mixer (Page 3 of 3)
• May serve as interface for com- MANUAL MIXING IN REAL TIME
DOS program that includes powerful
ponents connected to the Crown All setup is accomplished with IQ soft- graphics support and support of the full
Bus.
ware from a PC. You may make changes IQ product line. Sys-Config is an ad-
• Components supported include from software that affect VCA gain in real vanced package which has security,
other MPX units, SMX-6 mixers, time. Gain may also be manipulated in scheduling, alert reporting, and other
AMB-5 mixers, PIP-AP, PIP-APM, real time from alternate control devices powerful features plus the power of
PIP-APS, all MRX matrixers, and the such as a Drone or a third party control Turbo built in.
White 4700 Series EQ.
device (Ex. AMX, Crestron, Interface PC Requirements:
• No support for U-Code protocol. Controls, etc.). Once VCA gains are set The computer you select for use with
Setup Switches:
from the PC (or control device) the pro- your IQ System is very important. Exact
• The IQ Address is set by an 8 seg- cessor maintains that gain structure un- minimum requirement vary depending
ment DIP switch. Valid address values til it receives an instruction to change.
are 1 to 250 (0 and 251-255 are reserved
on the software package being used,
but for the more advanced software your
machine should at least be a 486SX/33
with the following: 4 MB RAM, 16550
for system usage).
SYSTEM LEVEL INFORMATION
• RS232/422 Standard switch must be Communication:
configured appropriately for use of the In an IQ System the basic communica- UART for the com port used by IQ, DOS
serial port. tion structure is based on the premise 6.2, Mouse (with DOS driver, third but-
• Baud is adjustable via DIP switch up that it must be able to support a PC be- ton features supported). In most cases
to 19200. This setting must be config- ing used with several IQ components. Turbo software will operate as a DOS
®
ured properly for use of the serial port. The computer is connected to the IQ application from Windows, including
®
• Parity is set ON or OFF and ODD or System interface via RS232. The inter-
EVEN via DIP switch. Normally set to face converts the protocol from RS232
OFF, this setting only applies to use of to Crown Bus media and back again. In
Windows 95.
SPECIFICATIONS
the serial port.
Memory Backup:
a small system or a single MPX system
the MPX itself may serve as the system
Maximum Input Level (Mic): +7 dBu.
Maximum Input Level (Line): +32 dBu.
Phantom Power: +44 VDC.
AC Power: 120/240 VAC 50/60 Hz.
Common Mode Rejection: 55 dB: 60 to 1 kHz
typical; 45 dB: 20 to 20 kHz.
Frequency Response: +0/-1 dB, 20 to 20 kHz.
THD: <0.05% at +4 dBm output; <0.15% at
+20 dBm output 20 to 20 kHz measured at
mic input with 40 dB gain.
Noise: Output noise all inputs off is –80dBu
(106 dB below rated output); output noise
with one line input at 0 dB is 80 dB; equiva-
lent input noise at mic input with 46 dB of
gain and 150 ohm source is –125 dBu. Note
that noise specs are typical, unweighted,
and 20 to 20 kHz.
The unit is equipped with a recharge- interface. The IQ-INT II, IQ-PSI, Drone,
able battery. The unit has 60 day SMX-6, AMB-5 and MPX-6 are all com-
memory backup on full charge.
ponents which may serve as a system
interface for an MPX-6. The Crown Bus
is a serial data loop carrier of IQ com-
mand protocol. Crown has implemented
COMPUTERIZED FEATURES
DSPI:
The Data Signal Presence Indicator it as a two wire twisted pair current loop
(DSPI) light on the front panel flashes to to allow for low cost long distance con-
indicate data traffic addressed to or from nections. For very long loops (over 1000
the unit. This light may be forced on from feet) data repeaters (IQ-RPT) or fiber
software.
Aux Port:
optic cable may be used to connect
equipment rooms that are some dis-
Theauxportonthemixerisusedtosend tance apart. The Crown Bus itself does
or receive a control voltage. From soft- not carry audio.
ware you may turn the aux output on or U-Code Protocol:
off. IQ software is also able to sense the U-Code is new form of IQ command
status of the aux input and is capable of protocol developed for enhanced new
taking independent action based on a product and third party product devel-
Crosstalk: Adjacent inputs/outputs at 1 kHz
better than –80 dB; adjacent inputs/outputs
20 to 20 kHz better than –65 dB.
sensed input.
Bus Output Relays:
opment. At this time the MPX-6 firmware
is not written in U-Code. Although it may
Guaranteed Excellence
Audio bus outputs are identical to their be used in systems with U-Code prod-
respective main outputs in every way ucts, the MPX-6 may not be used as
except for the addition of software con- system interface for U-Code products.
@crown
Crown International, Inc.
Professional Audio Division
PO Box 1000
trolled isolation relays.
VCA Gain Control:
Software:
Several IQ Software packages are avail-
Elkhart, IN 46515-1000
Ph. 800-342-6939/219-294-8200
Fax. 219-294-8301
The heart of the MPX is its functionality able to communicate with an MPX-6.
as a mixer. Each of the six main inputs Each unit is shipped with basic DOS
may be routed to either or both outputs software which allows you to communi-
by VCAs under processor control. The cate with the SMX-6, AMB-5, MPX-6,
VCAs offer a control range of –100 to and MRX Matrixer units. More advanced
Trademark Notice:
Algo,™ Distributed Intelligence,™ and MPX-6™ are
trademarks, Crown® and IQ System® are regis-
+25 dB.
software includes the Turbo or Sys-
Config software packages. Turbo is a
tered trademarks of Crown International Inc.
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