Crown IQ system AMB-5 Product Reference

* System
@crown
®
AMB-5
™
120 VAC
AUX
60 Hz
CTRL
20 W
RS232 / RS422
OVERVIEW
What is an AMB-5?
The AMB-5 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 ability of the AMB-5 operating as a
stand alone automatic mixer is distrib-
uted intelligence ™ . In an IQ System the
brains of the system live out in the sys-
tem. This means the audio system is not
going to be lost even if the computer or
communication cables fail. The AMB-5
is a unique mixer because it is capable
of sensing ambient crowd or machine
noise. It uses this as a reference to ad-
just the gain of the five main audio in-
puts. The AMB-5 also has a non-auto-
mated output which may be used for
monitoring or other purposes.
HARDWARE BLOCK DIAGRAM
Refer to the pictures of the front and rear
panels shown above and the block dia-
gram of the AMB-5 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
additional gain, or phantom (P)
which is 25 dB additional 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.
• Main input 6 is the noise sensing
®
Product Reference
Ambient Noise Sensing Mixer
CROWN BUS
AUDIO STACK AUDIO STACK
OUT IN OUT IN
SERIAL DATA LOOP
2 1
IN OUT IN
+ – + – MAIN BUS MAIN
INPUT
GROUND + – + – + –
ONLY
AMB-5 AMBIENT NOISE SENSING AUTOMATIC MIXER
(Front Panel shown above, Rear Panel shown below)
input. Although it is used differently
than the other main inputs, it has the
same basic features as main inputs.
Prefade sensors at the output of each
preamp stage sense input audio level
just before the input signal is delivered
to the processor controlled VCAs. There
are two VCAs under processor control
at the output of each sensor. 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 11 VCAs total, five per output mix with
one VCA to route ambient noise (input
6) to output 2. Note that in the AMB-5
there is no VCA control for input 6 to
output 1.
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
inputs by taking the outputs of one mixer
and going into the stack inputs of a sec-
ond mixer. This means that main inputs
AUDIO do not have to be used to expand the
ADD 25
0 5
IN FOR MIC
-5
10
1
effective size of the overall mixer.
-10
15
-12 21
Audio Main Outputs:
M L P
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 connec-
tion and balance the audio output. The
outputs are via 3 pin removable barrier
blocks.
Audio Bus Outputs:
In addition to the two main outputs, there
AMB-5 Automatic Mixer (Page 1 of 5)
SENSE AUDIO AUDIO
ADD 25 ADD 25
0 5 0 5
IN FOR MIC IN FOR MIC IN
-5 -5
10 10
5 4
-10 -10 -10
15 15
BUS -12 21 -12 21
M L P M L P
+ – + – + – +
AUDIO STACK
IN
OUT
1
MAIN BUS
+ – + –
DSPI ENABLE
AUDIO AUDIO
ADD 25 ADD 25 ADD 25
0 5 0 5 0 5
FOR MIC IN FOR MIC IN FOR MIC
-5 -5 -5
10 10 10
3 2
-10 -10
15 15 15
-12 21 -12 21 -12 21
M L P M L P M L P
– + – + –
are also two bus outputs. Bus outputs 1
and 2 provide the same audio output
as main outputs 1 and 2. Op-amps
buffer the summing bus to the output
connection and balance the audio out-
put. What makes the Bus Outputs dif-
ferent are relays under processor con-
trol 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
+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-
AUDIO
ADD 25
0 5
IN FOR MIC
-5
10
1
-10
15
-12 21
M L P
+ –