@crown
®
*
System
®
Product Reference
will not output level which would require
compression, so you might not config-
ure those inputs to participate in the
output compression scheme. Output
compressor parameters are primarily
per output rather than input and include:
• Compressor is a master ON/OFF
switch for each output that enables
or disables output compression for
that output.
• Limiter is an ON/OFF switch for
each VCA that configures which in-
puts may participate in output com-
pression.
• Threshold is the sensed output
level above which the compressor
begins to actuate. The range is –
100 to +25 dB and is set per out-
put.
• Ratio may be set to 1:1, 2:1, 4:1,
8:1, 16:1, 32:1 or
∞
:1 for each out-
put.
• Release Time is the time in sec-
onds to release compression at a
slope of seconds per 10 dB. The
range is 0.2 to 30 seconds for each
output.
Gate Count
The gate count feature attenuates all
gated on inputs when more than one
input is gated on by a predetermined
amount. The purpose of this feature is
to prevent feedback problems due to
multiple open mics. Settings are per
output channel. Parameters include:
• Gate Count Master is a global ON/
OFF switch.
• Gate Count is a set of ON/OFF
switches that dictates which VCAs
participate in the gate count.
• Amount is how much attenuation
per additional open mic. Each out-
put is set within a range of 0.5 to 16
dB.
Max Number of Open Mics
This feature is sometimes called a fili-
buster control because it can make the
mixer work in a first come first served
manner by limiting how many inputs may
gate open simultaneously. The only pa-
rameter to set is the actual maximum
number of open mics. The range is 1 to
6 with settings for each output.
Crown Local Net
Crown Local Net (CLN) is a special
mode of operation that is used when two
or more SMX units are stacked together
to form a wide automatic mic mixer
where system wide duck priority or gate
count features are required. This in-
volves both software and hardware
setup and it also requires that the serial
port of each mixer be dedicated to CLN
use. Note that if an SMX mixer is going
to be used on a CLN that the SMX can
not be used as a system interface. Due
to the number of steps and detail in-
volved with setup of a CLN, please con-
tact the Crown Technical Support Group
if you are interested in more information
on this feature.
SYSTEM LEVEL INFORMATION
Communication:
In an IQ System the basic communica-
tion structure is based on the premise
that it must be able to support a PC be-
ing used with several IQ components.
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 SMX system
the SMX itself may serve as the system
interface. The IQ-INT II, IQ-PSI, Drone,
SMX-6, AMB-5 and MPX-6 are all com-
ponents which may serve as a system
interface for an SMX-6. The Crown Bus
is a serial data loop carrier of IQ com-
mand protocol. Crown has implemented
it as a two wire twisted pair current loop
to allow for low cost long distance con-
nections. For very long loops (over 1000
feet) data repeaters (IQ-RPT) or fiber
optic cable may be used to connect
equipment rooms that are some dis-
tance apart. The Crown Bus itself does
not carry audio.
U-Code Protocol:
U-Code is new form of IQ command
protocol developed for enhanced new
product and third party product devel-
opment. At this time the SMX-6 firmware
is not written in U-Code. Although it may
be used in systems with U-Code prod-
ucts, the SMX-6 may not be used as
system interface for U-Code products.
Software:
Several IQ Software packages are avail-
able to communicate with an SMX-6.
Each unit is shipped with basic DOS
software which allows you to communi-
cate with the SMX-6, AMB-5, MPX-6,
and MRX Matrixer units. More advanced
software includes the Turbo or Sys-
Config software packages. Turbo is a
DOS program that includes powerful
graphics support and support of the full
IQ product line. Sys-Config is an ad-
vanced package which has security,
scheduling, alert reporting, and other
powerful features plus the power of
Turbo built in.
PC Requirements:
The computer you select for use with
your IQ System is very important. Exact
minimum requirement vary depending
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
UART for the com port used by IQ, DOS
6.2, Mouse (with DOS driver, third but-
ton features supported). In most cases
Turbo software will operate as a DOS
application from Windows,
®
including
Windows 95.
®
SPECIFICATIONS
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.
Crosstalk:
Adjacent inputs/outputs at 1 kHz
better than –80 dB; adjacent inputs/outputs
20 to 20 kHz better than –65 dB.
Guaranteed Excellence
@crown
Crown International, Inc.
Professional Audio Division
PO Box 1000
Elkhart, IN 46515-1000
Ph. 800-342-6939/219-294-8200
Fax. 219-294-8301
Trademark Notice:
Algo,
™
Distributed Intelligence,
™
and SMX-6
™
are
trademarks,
Crown
®
and IQ System
®
are regis-
tered trademarks of Crown International Inc.
SMX-6 Automatic Mixer (Page 5 of 5)
