GM/2
Dual Gain Manager
Operation Manual
®
Biamp Systems, 14130 N.W. Science Park, Portland, Oregon 97229 U.S.A. (503) 641-7287
an affiliate of Rauland-Borg Corp.
GM/2
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1
FRONT PANEL CONTROLS
auto silence
hold
limit
compress
input level
program
gain reduction
2
leveling
blend
output level
meter
select
6
8
output
input
10 12 14 16 18 20
-15 -12 -9
-6
-3
4
0
channel A
+3 +6 +9 +12
auto silence
hold
limit
speed gate process
slow
fast
out
in
bypass
active
compress
input level
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leveling
blend
output level
meter
select
6
8
output
input
10 12 14 16 18 20
-15 -12 -9
-6
-3
program
gain reduction
2
4
0 +3 +6 +9 +12
channel B
ADVANTAGE GM/2
Dual Gain Manager
speed gate process on
slow
fast
out
in
bypass
active
0120
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2
REAR PANEL CONNECTIONS
input
ADVANTAGE GM/2
input
output
Dual Gain Manager
patch
output
in/out
patch
channel
B
in/out
channel
A
MADE IN U.S.A.
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T
S
from Patch jack
T
to unbalanced input
S
from unbalanced output
R
T
S
3
FUNCTIONAL DESCRIPTION
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OPERATING INSTRUCTIONS
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APPLICATIONS
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45 012$ 8. 45 ; 45 0
A 8 DC
main
out
main
stack
main
patch
DC out
DC out
DC in
ADVANTAGE GM/2
input
in/out
8
in
patch
7
patch
AG
expansion
in
patch
8
aux
output
logic
outputs
in
6
patch
in/out
in/out
in/out
in/out
4
patch
patch
in/out
patch
in
patch
2
3
input
output
Dual Gain Manager
pad
in
patch
3
patch
5
in
patch
4
patch
6
in
patch
5
patch
7
in
patch
pad
pad
pad
pad
pad
pad
pad
patch
Advantage
ONE
1
in/out
2
patch
in/out
Advantage
AGII
1
output
in/out
patch
channel
B
channel
A
in/out
Advantage
GM/2
MADE IN U.S.A.
equalizer
amplifier
speakers
recorder
,C
$C
%C
&C
'C
(C
BC
*C
+C
,-C
,,C
,$C
,%C
,&C
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6
APPLICATIONS
<17 .). D3 8. 8 . 44 >4> # >4> . 54 5 9"3 54 3 4 D#
45 012$ 8. 45 ; 45 0
A 8 . DC
main
out
main
stack
main
patch
DC out
DC out
DC in
ADVANTAGE GM/2
input
in/out
8
in
patch
7
patch
AG
expansion
in
patch
8
aux
output
logic
outputs
in
6
patch
in/out
in/out
in/out
in/out
4
patch
patch
in/out
patch
in
patch
2
3
input
output
Dual Gain Manager
pad
in
patch
3
patch
5
in
patch
4
patch
6
in
patch
5
patch
7
in
patch
pad
pad
pad
pad
pad
pad
pad
patch
Advantage
ONE
1
in/out
2
patch
in/out
Advantage
AGII
1
output
in/out
patch
channel
B
channel
A
in/out
Advantage
GM/2
MADE IN U.S.A.
equalizer
amplifier
speakers
,C
$C
%C
&C
'C
(C
BC
*C
+C
,-C
,,C
,$C
,%C
,&C
,'C
,(C
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7
APPLICATIONS
7 4 D3 8. . 4 " 4 D" 2I 4
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45 012$ 8. D 4 "
A 8 44 DC
MAIN
OUTPUT
AUXILIARY
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
mixer
ADVANTAGE GM/2
input
input
output
Dual Gain Manager
patch
output
in/out
patch
channel
B
channel
A
in/out
Advantage
GM/2
MADE IN U.S.A.
auxiliary
equalizer
main
equalizer
auxiliary
amplifier
main
amplifier
auxiliary
speakers
main
speakers
,C
$C
%C
&C
'C
(C
BC
*C
+C
,-C
,,C
. . . . D#
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4: . 012$ 5 . 4 A # 'C#
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8
USER OPTIONS
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Patch
In/Out
(one channel shown)
+8
+4
0
-10
J3 - Output Reference
J3 OUTPUT
LIMITER
INPUT J2
+8
+4
0
R86
J2 - Input Reference
0dB
+15dB
SW3
R86 - Limiter Threshold
Process Gate Speed
Output
Level
Blend
Input
Level
Mono
Stereo
operation operation
J4 - Stereo Strapping
(J4 position is labelled "SW3")
(Channel A circuit board only)
9
-10
BLOCK DIAGRAM
T
patch
R
R
in/out
T
input reference
select
-10, 0, +4, +8
balanced
input
output reference
select
-10, 0, +4, +8
active
RF protection
network
VCA
balanced
output
process
bypass
balanced
& floating
line driver
output
level
auto silence
hold
rectifier
soft gate
average
drive
out
soft gate
in
meter
select
rectifier
output
input
rectifier
threshold
peak
driver
M
display
limiter
compression
drive
input
level
compression
leveling
drive
blend
level
speed
fast
slow
expansion
program
leveling
meter
select
gain
reduction
dynamic silence
hold
GM/2 Block Diagram
(one channel shown)
10
SPECIFICATIONS
INPUT:
LEVELING:
Input Impedance
Attack Time (program dependent)
(balanced)
48k ohms
(fast)
0.5-0.75 seconds
(unbalanced)
24k ohms
(slow)
1.0-2.5 seconds
Nominal Level @ 0VU (selectable)
Maximum Input Level
Common Mode Rejection Ratio (20Hz-20kHz)
Release Time (program dependent)
-10, 0, +4, or +8dB
+27dBu
(fast)
1.0-5.0 seconds
>40dB
(slow)
2.5-15.0 seconds
Rate (program dependent)
OUTPUT:
(fast)
Output Impedance
(slow)
0.5-10dB/second
Threshold
15dB below 0VU
(balanced)
200 ohms
(unbalanced)
100 ohms
Maximum Output
+19dBu
COMPRESSION:
Frequency Response (10Hz-50kHz)
+0/-1dB
Attack Time (program dependent)
Hum & Noise (20Hz-20kHz @ unity gain)
<-90dBu
Release Time (program dependent)
Ratio
Total Harmonic Distortion (20Hz-20kHz)
(+4dBu output/10dB of compression)
Threshold
<0.15%
2-20dB/second
5-40mS
200-500mS
1.1:1-10:1
30dB below 0VU
Intermodulation Distortion (SMPTE)
(+4dBu output/10dB of compression)
POWER CONSUMPTION (120/240VAC):
PEAK LIMITER:
<0.3%
20 Watts max.
Attack Time
250S
Release Time
15mS
Threshold (adjustable)
0-15dB above 0VU
DIMENSIONS:
Height (1 rack space)
1.75 inches (44mm)
SOFT-GATE:
Width
19 inches (483mm)
Attack Time
Depth
7 inches (178mm)
Release Time
Threshold
WEIGHT:
Gain (dB reduction/dB signal below threshold)
6 lbs. (2.72kg)
11
1mS
100mS
25dB below 0VU
20dB/10dB
WARRANTY
BIAMP SYSTEMS IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR
LIMITED WARRANTY TO THE ORIGINAL PURCHASER OF THE
PROFESSIONAL SOUND EQUIPMENT DESCRIBED IN THIS MANUAL.
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Thank you for purchasing BIAMP SYSTEMS...
AMERICAN SOUND CRAFTSMANSHIP
Biamp Systems
14130 N.W. Science Park
Portland, Oregon 97229
(503) 641-7287
585-0061-00