Rane MA 4 User manual

Data Sheet-1
MA 4
MULTICHANNEL AMPLIFIER
Features
• Universal voltage, power-factor-corrected power supply
• Very low inrush current
• 100 watts x 4 channels in 1U chassis
• Built-in load monitoring
• Remote fault reporting and redundancy switching
• Optional 4 channel 70/100 volt transformers in 1U chassis
• Adjustable high-pass lters and remote level controllable
• Advanced dynamics control adjusts for sensitivity setting, load Z
and temperature
DATA SHEET
General Description
e 100 watt per channel, four-channel MA 4 amplier achieves
unparalleled power density, reliability and features in a space
saving 1U, 19 inch rack mount chassis weighing only eight
pounds (3.6 kg). A universal-voltage switching power supply
provides near perfect Power-Factor, reducing peak currents to
⅓ compared to non power-factor-corrected supplies. A long list
of unique features ranging from constant load power to built in
automatic redundancy switching to advanced dynamics control,
qualify the MA 4 for the most demanding xed installation
applications. e MA 4 excels in music & paging systems, small
conference rooms and speech reinforcement applications requir-
ing multiple ampliers. Advanced dynamics control algorithms
adapt to changes in temperature, load impedance and sensitivity
setting. e result is a truly plug-and-play amplier that ensures
excellent signal integrity at all times.
MT 4
MULTICHANNEL
TRANSFORMER
1234
MADE IN U.S.A.
RANE CORP.
MT 4
+
IN OUT
– 100V 70V COM +
IN OUT
– 100V 70V COM +
IN OUT
– 100V 70V COM +
IN OUT
IN OUT IN OUT IN OUT IN OUT
– 100V 70V COM
+ – 100V 70V COM + – 100V 70V COM + – 100V 70V COM + – 100V 70V COM
Accessories
4
0
2
6
8
10
LEVEL
MT 4 Multichannel Transformer provides 100V or 70.7V constant-voltage distribution. VR 2 Volume Remotes
can control the level from
within each zone.

Data Sheet-2
MA 4
MULTICHANNEL AMPLIFIER
Specifications
Parameter Specication Conditions/Comments
Input impedance 10 k Each leg, dierential, 1 kHz
Maximum input +22 dBu
Sensitivity range/resolution +22 to +4 dBu 256 steps
Remote level control range/resolution Attenuate only; 0 dB to –80 dB Audio taper response, 256 steps
Fault ag in/out Active 5V high-side drive, passive pull down. NO Fault = +5V; Fault = 0V
Limiter Oversampled instantaneous attack 3 dB per second decay
..........Load compensated Limit set for 7.5 amps peak Based on load Z
Compressor 50 ms rms detector reshold relative to limiter
..........reshold 10 dB re peak dBFS Rear panel dipswitch on/o
..........Attack 1.5 second
..........Decay 3 dB per second
..........Knee Span 10 dB
Expander Select on rear panel rms detector
..........reshold -70 dBFS
..........Attack 50 ms Gain reduction release time constant
..........Decay 10 dB per second Rate of gain reduction
High-pass lter 12 dB per octave, Butterworth 20, 40, 60, 80 Hz dipswitch select
Load sensing 2 to 16 normal Green Load indicator on
..........Low load detect Below 2 is low Green Load indicator ashing
..........High load detect Above 16 is high Green Load indicator o
..........Min average power 3.3 watts average required for good load estimate
Output
..........Power 100 watts 3 to 8 
..........Frequency response 20 Hz to 20 kHz +0, -3 dB
..........Dynamic range >90 dB A-weighted, typical
..........THD+N 0.1% typ 100 watts into 4, 20-20 kHz
..........Clock fundamental 310 kHz <10 mV residual
..........Relay switching Turn on mute, fault protection, redundancy switching
Fan cooling Temperature controlled, variable speed Intake left side, exhaust right side
Heat load in Btu/hr 100 / 240 volts AC 50/60 Hz
..........Standby 10.2 / 13.3
..........Run mode, no signal 112.3 / 95.5
..........All channels driven 167 / 139 pink noise, average ⅛th power, 4:1 crest
AC Mains 100 to 240 VAC ±10%, 50 or 60 Hz
PFC 100 kHz boost
DC/DC 200 kHz forward
Unit: Conformity FCC, UL
..........Construction All Steel
..........Size 1.75"H x 19"W x 9.25"D (4.4 cm x 48.3 cm x 23.5 cm)
..........Weight: 8 lb (3.6 kg)
Shipping: Size 4.5" x 20.3" x 13.75" (11.5 cm x 52 cm x 35 cm)
..........Weight: 11 lb (5 kg)
All specications typical unless otherwise noted.

Data Sheet-3
MA 4
MULTICHANNEL AMPLIFIER
MA 4
100-240V
50/60 Hz 500 WATTS
MADE IN U.S.A.
RANE CORP.
Class 2 Wiring
OUTPUTS
Active Low Use Rane VR 2 or 20 kΩ pot
HIGH-PASS
20Hz
40Hz
60Hz
80Hz
ON
4
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
REMOTE LEVEL 4
4FLAG 3 2 1
FAULT
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
3
2
1
MASTER
SLAVE
COMP
4
3
2
1
1
2
3
4
+
–
+
–
+
–
+
–
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
+
–
+
–
+
–
+
–
INPUTSMODE
13
22
dBu
SENSITIVITY
4
3
13
22
dBu
SENSITIVITY
4
2
13
22
dBu
SENSITIVITY
4
1
13
22
dBu
SENSITIVITY
4
EXP ON
3
INT EXT
LOAD
2
INT EXT
LOAD
1
INT EXT
LOAD
4
INT EXT
LOAD
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
FOR CONTINUED GROUNDING
PROTECTION DO NOT REMOVE
THIS SCREW.
4321
ON
4321
ON
FOR CONTINUED GROUNDING
PROTECTION DO NOT REMOVE
THIS SCREW.
1 24690q 578 3
1Universal voltage, power-factor corrected, switch mode power supply operates 85 to 260 VAC, 50 Hz or 60 Hz. e supply
features under and over voltage protection, low inrush current and operates with up to 85% eciency.
2INPUTS are balanced and accept up to +22 dBu via Euroblock connectors with strain-relief.
3SENSITIVITY controls allow continuous adjustment from +22 dBu to +4 dBu. Integrated limiter prevents clipping regardless of
input level and sensitivity setting.
4REMOTE DC LEVEL control ports with Euroblock strain-relief connectors allow audio taper attenuation using optional VR 2
remote (or use 10k to 100k  linear pot). Clickless muting may be implemented using a switch, connecting Vr to Vc.
5A soft knee COMPressor is provided with rms threshold relative to the limit threshold. ON/o setting aects all channels. is
allows uncompressed operation with typical program material while reducing continuous sine-wave power. Ratio is 3:1; Attack is
1.5 seconds; Decay is 3 dB per second; Soft knee span is 10 dB.
6Downward EXPander reduces noise in the absence of signal. ON/o setting eects all channels.
 RMS reshold: –70 dBFS; Ratio: 3:1; Attack: 50 ms; Gain reduction: 10dB/sec.
7Selectable 20 Hz, 40 Hz, 60 Hz or 80 Hz HIGH-PASS lters are provided. e setting aects all channels. Filters are 12 dB per
octave, Butterworth alignment.
8Each channel is set for MASTER or SLAVE operation. Master channels write Fault Flag status. Slave channels read Fault Flag
status.
• e Master setting is used for remote fault reporting and/or automatic redundancy switching control.
• e Slave setting is used for individual channel remote power sequencing or automatic redundancy switching.
9Individual FAULT FLAG ports are provided for each channel.
• e Fault Flag uses high-side active drive and passive pull down. No fault = +5 volts. Fault = 0 volts.
• Channels set to Master drive the Fault Flag high when no fault is present. Passive pull down pulls the Fault Flag low when a
fault occurs or power is lost.
• Slave channels read the status of the Fault Flag.
0Amplier outputs are oating (not ground referenced) and are not bridgeable. Each channel delivers 100 watts into a 4 or 8
load. Average load impedance is estimated then used to determine the limiter threshold required to limit maximum power to 100
watts and peak current to less than 7.5 amps. Impedance estimation requires a minimum of 3.3 watts and is averaged over 180 ms.
qExternal amplier input is used for Internal, automatic redundancy switching.
wComprehensive front panel metering is included for each channel:
• Four segment, load sensitive headroom meter shows remaining headroom.
• Limiter, Compressor and Expander indicators light when the associated dynamics control is active.
• e Fault indicator lights when a fault is detected
• e Load indicator if o when impedance is above 16, on when impedance is between 2 and 16 and ashing when the
impedance is below 2.
• e Ready indicator is o when the power switch is o, ashing when the power is switch is ON and the unit is in standby
(Slave channel with high fault ag) and on when the channel is active.
dB Headroom dB Headroom dB Headroom dB Headroom
3
6
12
24
Limit
1
Comp
Exp
Fault
Load
Ready
3
6
12
24
Limit
2
Comp
Exp
Fault
Load
Ready
3
6
12
24
Limit
3
Comp
Exp
Fault
Load
Ready
3
6
12
24
Limit
4
ON
Comp
Exp
Fault
Load
Ready
w

Data Sheet-4
MA 4
MULTICHANNEL AMPLIFIER
POWER-FACTOR-
CORRECTION
SWITCH-MODE
POWER SUPPLY
TUPNI
GALFTLUAF
1H
C
1
EVALS/RETSAM
Bd3
Bd6
Bd21
Bd42
COMBINATION CONTROLLER
DRAWROFWS-2
ESUF RETLIFIME HSURNI EGATLOVREVO
H3
G2
N1
CEI ECNAILPPA TELNI
)zHk001( )zHk002(
CDA
TUPNI
2H
C
TUPNI
3H
C
TUPNI
4H
C
CDA
DNG
52+
52-
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
CAD
RETLIF .TTA
FILTER
CAD
RETLIF .TTA
FILTER
RETLIF .TTA
FILTER
RETLIF .TTA
FILTER
52+
52-
KLC
KLC
KLC
KLC
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
4-HC3-HC2-HC1-HC
PSD
TSOH
DNG
YTIVITISNES
4HC3HC2HC1HC
DNG
A5+
LEVELETOMER
1HC 2HC 3HC 4HC
1HC
2HC
3HC
4HC
ESNESTNERRUC
4HC3HC2HC1HC
ESNESPMET
+
-
REIFILPMA
TXE
TUPTUO
1HC
4A/3A2A/1A
DNG
A5+DNG A5+ DNG
A5+
3cV1c
V4
cV2cV
4+22+
WOLEVITCA
1
COMP ON/OFF
EXP ON/OFF
00 10 01 11 zH02 ZH04 zH06 zH08
:EDOM V8.0OTV0.0:YBDNATS V0.3OTV2.2:ETUM V5.5OTV2.4:NO
1M
2M
3M
4M
1M
2M
3M
4M
ESNESYLPPUS )52±(
TIMILTUPNI
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
DETECT
RMS
OUTPUT LEVEL
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
SMR
2HC
1HC
3HC
4HC
4+4+22+4+22+22+
yalerV
d5+
3.3+
a5+
52+
52-
52+
52-
52+
52-
+
DNG
1RV
+
-
+
-
TXE
TUPTUO
2HC
+
DNG2RV
+
-
+
-
TXE
TUPTUO
3HC
+
DNG
3RV
+
-
+
-
TXE
TUPTUO
4HC
+
DNG4RV
+
-
KCOLCYLPPUS
KCOLCYLPPUS
KCOLCPMA
KCOLCYLPPUS
DETECT
RMS
OUTPUT LEVEL
DETECT
RMS
OUTPUT LEVEL
DETECT
RMS
OUTPUT LEVEL
ETOMER LEVEL
ETOMER LEVEL
ETOMER LEVEL
ETOMER LEVEL
LOW VOLTAGE
FLYBACK
Block Diagram

Data Sheet-5
MA 4
MULTICHANNEL AMPLIFIER
POWER-FACTOR-
CORRECTION
SWITCH-MODE
POWER SUPPLY
TUPNI
GALFTLUAF
1HC
1
EVALS/RETSAM
Bd3
Bd6
Bd21
Bd42
COMBINATION CONTROLLER
DRAWROFWS-2
ESUF RETLIFIME HSURNI EGATLOVREVO
H3
G2
N1
CEI ECNAILPPA TELNI
)zHk001( )zHk002(
CDA
TUPNI
2HC
TUPNI
3HC
TUPNI
4HC
CDA
DNG
52+
52-
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
CAD
RETLIF .TTA
FILTER
CAD
RETLIF .TTA
FILTER
RETLIF .TTA
FILTER
RETLIF .TTA
FILTER
52+
52-
KLC
KLC
KLC
KLC
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
Bd3
Bd6
Bd21
Bd42
TIMIL
PMOC
TLUAF
DAOL
YDAERPXE
4-HC3-HC2-HC1-HC
PSD
TSOH
DNG
YTIVITISNES
4HC3HC2HC1HC
DNG
A5+
LEVELETOMER
1HC 2HC 3HC 4HC
1HC
2HC
3HC
4HC
ESNESTNERRUC
4HC3HC2HC1HC
ESNESPMET
+
-
REIFILPMA
TXE
TUPTUO
1
HC
4A/3A2A/1A
DNG
A5+DNG A5+ DNG
A5+
3cV1cV4cV2cV
4+22+
WOLEVITCA
1
COMP ON/OFF
EXP ON/OFF
00 10 01 11 zH02 ZH04 zH06 zH08
:EDOM V8.0OTV0.0:YBDNATS V0.3OTV2.2:ETUM V5.5OTV2.4:NO
1M
2M
3M
4M
1M
2M
3M
4M
ESNESYLPPUS )52±(
TIMILTUPNI
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
DETECT
RMS
OUTPUT LEVEL
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
SMR
YTIVITISNES
SSAP-HGIH
08-06-04-02
ROSSERPMOC
RETIMILKAEP
DNAPXE
TIMILTUPNI
SMR
2HC
1HC
3HC
4HC
4+4+22+4+22+22+
yalerV
d5+
3.3+
a5+
52+
52-
52+
52-
52+
52-
+
DNG
1RV
+
-
+
-
TXE
TUPTUO
2
HC
+
DNG2RV
+
-
+
-
TXE
TUPTUO
3
HC
+
DNG
3RV
+
-
+
-
TXE
TUPTUO
4
HC
+
DNG4RV
+
-
KCOLCYLPPUS
KCOLCYLPPUS
KCOLCPMA
KCOLCYLPPUS
DETECT
RMS
OUTPUT LEVEL
DETECT
RMS
OUTPUT LEVEL
DETECT
RMS
OUTPUT LEVEL
ETOMER LEVEL
ETOMER LEVEL
ETOMER LEVEL
ETOMER LEVEL
LOW VOLTAGE
FLYBACK

Data Sheet-6
MA 4
MULTICHANNEL AMPLIFIER
Power-Factor-Correction (PFC)
Near perfect Power-Factor with ⅓ the peak current and ½ the
average current (green) compared to non power-factor-corrected
supply with conduction of 3 ms (black). e response is mea-
sured at 100 watts.
Architectural Specifications
e unit shall be a four channel amplier. It shall deliver 100
watts of power per channel into a 4 to 8 ohm load. e ampli-
er shall incorporate load sensing with normal operation in the
range of 2 to 16 ohms. Front panel indicators shall alert presence
of a channel load outside of this range.
e amplier shall have balanced inputs with Euroblock
connectors and Euroblock output connectors capable of accept-
ing 12 gauge wire. Sensitivity controls with a range of +22 to +4
dBu shall be provided for each input on the rear panel by means
of screwdriver adjustment. Load sensitive headroom meters shall
provide indication of 3, 6, 12 and 24 dB of remaining headroom.
Euroblock connectors shall be provided as a means of con-
necting remote DC level potentiometers or switches to attenuate
the input level of each channel.
Automatic redundancy switching shall be provided in the
event of a fault of any amplier channel. Euroblock connectors
shall provide a means of connecting additional amplier outputs
for automatic backup purposes. Each channel shall have master
or slave operation determined by a rear panel dipswitch. Master
channels shall write fault ag status, and Slave channels shall
read fault ag status.
A rear panel dipswitch shall provide a selection of 20, 40, 60
or 80 Hz highpass 2nd-order Butterworth lters. Load sensitive
limiter circuits shall prevent clipping and the associated loss of
speech intelligibility. A front panel LED shall indicate limiter
activity within each channel.
Built-in compressors shall be provided with a 10 dB thresh-
old. A rear panel dipswitch shall activate or deactive the com-
pressors. A front panel LED shall indicate compressor activity
within each channel.
Built-in expanders shall be provided with a -70 dBFS thresh-
old. A rear panel dipswitch shall activate or deactive the expand-
ers. A front panel LED shall indicate expander activity within
each channel.
Euroblock connectors on the rear panel shall provide a means
of transmitting or receiving fault ag information to other
ampliers or indicators with an active 5 volt drive. A front panel
LED shall indicate a fault ag condition within each channel.
ermal management shall employ forced air cooling, allow-
ing the ampliers to operate reliable in ventilated racks at 40°C
ambient temperature. e fan speed air ow shall be controlled
by temperature. Intake shall be on the left side of the chassis and
exhaust on the right side, incorporating low velocity air ow to
minimize noise within a rack cabinet.
e universal internal switch-mode power supply shall
operate from 100 to 240 VAC, 50 or 60 Hz. e power supply
design shall provide power-factor-correction with very low inrush
current and overvoltage protection. An IEC connector and IEC
cord shall be utilized. A front panel mounted power switch shall
be provided.
e unit shall be a Rane Corporation Model MA 4.
Compressor Response
Output dB re 100W
O
u
t
p
u
t
P
o
w
e
r
Attack: 1.5 seconds
Release: 3 dB per second
Output Power
Output dB
Input dBu

Data Sheet-7
MA 4
MULTICHANNEL AMPLIFIER
MA 4
100-240V
50/60 Hz 500 WATTS
MADE IN U.S.A.
RANE CORP.
Class 2 Wiring
OUTPUTS
Active Low Use Rane VR 2 or 20 kΩ pot
HIGH-PASS
20Hz
40Hz
60Hz
80Hz
ON
4
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
REMOTE LEVEL 4
4FLAG 3 2 1
FAULT
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
3
2
1
MASTER
SLAVE
COMP
4
3
2
1
1
2
3
4
+
–
+
–
+
–
+
–
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
+
–
+
–
+
–
+
–
INPUTSMODE
13
22
dBu
SENSITIVITY
4
3
13
22
dBu
SENSITIVITY
4
2
13
22
dBu
SENSITIVITY
4
1
13
22
dBu
SENSITIVITY
4
EXP ON
3
INT EXT
LOAD
2
INT EXT
LOAD
1
INT EXT
LOAD
4
INT EXT
LOAD
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
4321
ON
4321
ON
+
–
+
–
+
–
+
–
SOURCE 4
SOURCE 3
SOURCE 2
SOURCE 1
MA 4
100-240V
50/60 Hz 500 WATTS
MADE IN U.S.A.
RANE CORP.
Class 2 Wiring
OUTPUTS
Active Low Use Rane VR 2 or 20 kΩ pot
HIGH-PASS
20Hz
40Hz
60Hz
80Hz
ON
4
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
REMOTE LEVEL 4
4FLAG 3 2 1
FAULT
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
3
2
1
MASTER
SLAVE
COMP
4
3
2
1
1
2
3
4
+
–
+
–
+
–
+
–
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
+
–
+
–
+
–
+
–
INPUTSMODE
13
22
dBu
SENSITIVITY
4
3
13
22
dBu
SENSITIVITY
4
2
13
22
dBu
SENSITIVITY
4
1
13
22
dBu
SENSITIVITY
4
EXP ON
3
INT EXT
LOAD
2
INT EXT
LOAD
1
INT EXT
LOAD
4
INT EXT
LOAD
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
4321
ON
4321
ON
+5V
Advanced Application - Remote Turn-on
If you wish to operate an amplier channel in low power standby with remote turn-on, set its rear panel switch to SLAVE.
External +5 volts connected to the FAULT FLAG holds the amplier in standby.
Floating the FAULT FLAG or connecting it to ground turns the channel on.
Basic Application
Don't let those extra connections and switches intimidate you.
e MA 4 is a high-quality general-purpose amplier and connects like any other.

Data Sheet-8
MA 4
MULTICHANNEL AMPLIFIER
All features & specications subject to change without notice. 2-2014
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL [phone] FAX [phone] WEB rane.com
MA 4
100-240V
50/60 Hz 500 WATTS
MADE IN U.S.A.
RANE CORP.
Class 2 Wiring
OUTPUTS
Active Low Use Rane VR 2 or 20 kΩ pot
HIGH-PASS
20Hz
40Hz
60Hz
80Hz
ON
4
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
REMOTE LEVEL 4
4FLAG 3 2 1
FAU LT
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
3
2
1
MASTER
SLAVE
COMP
4
3
2
1
1
2
3
4
+
–
+
–
+
–
+
–
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
+
–
+
–
+
–
+
–
INPUTSMODE
13
22
dBu
SENSITIVITY
4
3
13
22
dBu
SENSITIVITY
4
2
13
22
dBu
SENSITIVITY
4
1
13
22
dBu
SENSITIVITY
4
EXP ON
3
INT EXT
LOAD
2
INT EXT
LOAD
1
INT EXT
LOAD
4
INT EXT
LOAD
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
4321
ON
4321
ON
MA 4
100-240V
50/60 Hz 500 WATTS
MADE IN U.S.A.
RANE CORP.
Class 2 Wiring
OUTPUTS
Active Low Use Rane VR 2 or 20 kΩ pot
HIGH-PASS
20Hz
40Hz
60Hz
80Hz
ON
4
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
REMOTE LEVEL 4
4FLAG 3 2 1
FAU LT
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
3
2
1
MASTER
SLAVE
COMP
4
3
2
1
1
2
3
4
+
–
+
–
+
–
+
–
Vr
Vc
Vr
Vc
Vr
Vc
Vr
Vc
+
–
+
–
+
–
+
–
INPUTSMODE
13
22
dBu
SENSITIVITY
4
3
13
22
dBu
SENSITIVITY
4
2
13
22
dBu
SENSITIVITY
4
1
13
22
dBu
SENSITIVITY
4
EXP ON
3
INT EXT
LOAD
2
INT EXT
LOAD
1
INT EXT
LOAD
4
INT EXT
LOAD
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
4321
ON
4321
ON
4
0
2
6
8
10
LEVEL
4
0
2
6
8
10
LEVEL
4
0
2
6
8
10
LEVEL
4
0
2
6
8
10
LEVEL
+
–
+
–
+
–
+
–
VR 2
VOLUME
REMOTES
ZONE 1 ZONE 2 ZONE 3 ZONE 4
SOURCE 4
SOURCE 3
SOURCE 2
SOURCE 1
FOR CONTINUED GROUNDING
PROTECTION DO NOT REMOVE
THIS SCREW.
FOR CONTINUED GROUNDING
PROTECTION DO NOT REMOVE
THIS SCREW.
MASTER
MA 4
SLAVE
MA 4
Advanced Application - Fault Reporting
If you wish to have an amplier channel report a fault to a control system or back up amplier, set it to Master. e Fault Flag is
held high (+5 volts) during normal operation and goes low (passive pull down) when a fault occurs. For information about Fault Flag
operation (applications and reported faults) see the Manual, page 3.
Remote Level Control inputs are provided for each channel. e Rane VR 2 or any 10k to 100 k potentiometer may be con-
nected to these inputs.
References
1. D. Bohn, “Constant-Voltage Audio Distribution Systems,” RaneNote, (2000).