Specifications - Crown IQ system AMB-5 Product Reference

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• Ratio may be set to 1:1, 2:1, 4:1,
8:1, 16:1, 32:1 or :1.
• 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.
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. 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 with 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
5.
Ambient Noise Control
The ambient noise control feature of the
AMB-5 is the feature that sets the AMB-
5 apart. It is actually a subtractive sys-
tem. The other features for automatic
mixing are configured first. Mix param-
eters are setup based on attaining the
output level you want under the highest
ambient noise conditions that you are
going to attempt to compensate for. The
ambient noise control feature is then
configured to reduce overall gain when
the ambient noise is less than maximum.
You essentially setup a window of maxi-
mum and minimum system gain and
configure the ambient noise control fea-
ture to control gain within that range.
Parameters include:
• AMB is the ON/OFF switch for this
feature.
• Attack Time is the slope of gain
increase as the sensed ambient
noise increases in seconds per 10
dB. The range is 0.2 to 30 seconds.
• Decay Time is the slope of gain
decrease as the sensed ambient
noise decreases in seconds per 10
dB. The range is 0.2 to 30 seconds.
• Expansion Ratio is the ratio of the
ratio of the change in ambient noise
to the change in gain. It may be set
to 1:1, 1.5:1, 2:1, 3:1, 4:1, or 5:1.
• Threshold is the sensed ambient
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Product Reference
AMB-5 Automatic Mixer (Page 5 of 5)
noise level above which the mix
level is adjusted by the ambient
noise control function.
• Ambient Offset is the reduction in
gain, in dB, when ambient noise is
below the Threshold. The gain of the
mixer at low ambient noise condi-
tions equals programmed level mi-
nus Ambient Offset. Gain increases
from programmed level minus Am-
bient Offset toward programmed
level according to the Expansion
Ratio.
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 AMB system
the AMB 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 AMB-5. 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 AMB-5 firmware
is not written in U-Code. Although it may
be used in systems with U-Code prod-
ucts, the AMB-5 may not be used as
system interface for U-Code products.
Software:
Several IQ Software packages are avail-
able to communicate with an AMB-5.
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,
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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 AMB-5
trademarks, Crown ® and IQ System
tered trademarks of Crown International Inc.
® including
™ are
® are regis-