Rane | MA 3 | Data Sheet | Rane MA 3 Amplifier Data Sheet

Rane MA 3 Amplifier Data Sheet
DATA SHEET
MA 3
MULTICHANNEL AMPLIFIER
1
2
3
0
0
0
3
3
3
6
6
6
12
12
POWER
MA 3
MULTICHANNEL
AMPLIFIER
12
dB
CHANNEL OUTPUT HEADROOM
POWER
General Description
The MA 3 is a three-channel amplifier designed to operate
reliably in commercial environments. The MA 3 was specifically
designed for use in:
• Paging
• Foreground Music
• Background Music Distribution
and with the Rane family of paging, foreground music, and
background music products, such as the Rane CP series.
Each channel of the MA 3 delivers 40 watts of continuous average power into 8Ω and 60 watts into 4Ω. Up to three optional
40 watt, 70.7 volt or 100 volt constant-voltage audio transformers may be installed inside the MA 3, eliminating the need for
external wiring or transformer mounting. See the TF 407 / TF
410 data sheet for more information.
The MA 3 uses a conventional linear power supply with
toroidal transformer. This configuration minimizes the emissions associated with switching supplies and noisier transformer
designs. The power supply features independent secondary supplies
for each channel, minimizing load regulation interaction and
crosstalk.
Thermal management is accomplished with a sealed heattunnel design incorporating low velocity forced air and large
aperture openings. This design minimizes the noise usually associated with forced air cooling and eliminates the need for an air
filter. Forced air cooling allows the amplifier to operate reliably
in harsh environments and avoid the buildup of heat in unventilated racks associated with passive convection cooling.
The combination of a solid, conservative power supply and
forced air cooling allows the MA 3 to simultaneously deliver 60
watts of continuous-average-power to all three channels.
SPiKe®* dynamic protection circuitry completely safeguards
each channel against over-voltage, under-voltage, overloads,
transients from inductive loads, thermal runaway and instantaneous temperature peaks. Biasing is not allowed to occur when
an under-voltage condition exists, reducing turn on and turn off
transients.
Fast-response limiters allow the MA 3 to tolerate up to 20
dB of overdrive into 8 and 4Ω loads while holding THD below
1%. This means no loss of speech intelligibility or harsh clipping.
This feature greatly increases the dynamic range of the system
without external limiters.
Peak-responding, load-adaptive meters accurately indicate the
remaining headroom. The meters are helpful in setting system
levels and indicating signal compression.
Balanced inputs with Euroblock connectors are provided.
Euroblock output connectors accept up to 12 gauge wire. Rear
panel Level controls allow amplifier sensitivity adjustment. Internally selectable 80 Hz highpass filters offer protection against
over excursion of small bookshelf speakers and saturation of
distribution transformers at low frequencies.
Features
•
•
•
•
•
•
•
3 Independent Amplifiers
60W per Channel Continuous Average Power into 4Ω, 20-20k Hz
40W per Channel Continuous Average Power into 8Ω, 20-20k Hz
Load Sensitive Dynamic Limiters
Load Sensitive Headroom Meters
SPiKe® Protection Circuitry
High Capacity Linear Power Supply
•
•
•
•
•
•
•
Sealed Heat-Tunnel Forced Air Cooling
Input Level Controls (on rear panel)
80 Hz High Pass Filter Selection
Euroblock Connectors
IEC Socket and Line Cord
3 Optional Internal 70.7 V or 100 V Distribution Transformers
UL/cUL Certification
*SPiKe is a registered trademark of National Semiconductor Corporation.
Data Sheet-
MA 3
MULTICHANNEL AMPLIFIER
Features and Specifications
Parameter
Input:
Impedance
Maximum Input Level
Sensitivity
CMR
Highpass Filter
Amplifier: Gain
Power Output
Frequency Response
S/N
Crosstalk
THD+N
Slew Rate
Damping Factor
On/Off Transient Muting
Fan Cooling
Tunnel Power Dissipation
SOA
Limiter: Attack Time
Decay Time
Threshold
Action
Meter: Attack Time
Decay Time
Indicators
Supply: Type
Line Voltage
Power Consumption
Total Load & Unit
Optional Transformers:
Insertion Loss
Unit: Agency Listing
..........120 VAC model
..........Construction
..........Size
..........Weight
Shipping: Size
..........Weight
Specification
Euroblock Connector
20k
+20
Off to 0
40
80 Hz (switchable)
27
40/60
20 - 20k
90
-60
0.05%
0.1%
0.2%
10
80
Active
Active Constant-Current
120W; 410 BTU/hr
SPiKe*
10
3000
0.1% THD+N
1% THD+N
20
500
0, 3, 6 ,12
Linear; Toroidal Transformer
120/230
33.6W; 115 BTU/hr
360W; 1200 BTU/hr
40
0.5
UL
cUL (Canada)
All Steel
3.5"H x 19"W x 9"D (2U)
26 lb
4.25" x 20.3" x 13.75"
30 lb
Limit
Units
Conditions/Comments
min.
min.
Ω
dBu
dBu
dB
Hz
dB
watts
Hz
dBr
dB
Each leg
min.
±2.5%
±0.5
min.
min.
max.
typ.
typ.
typ.
min.
min.
typ.
typ.
typ.
max.
typ.
typ.
+0, -2
V/µs
ms
ms
ms
ms
dB
VAC
typ.
typ.
Input required for full power; 8Ω
20 Hz to 20 kHz
2nd-order butterworth
1 kHz
8/4 Ω cont. avg. power, all channels driven
+0, -.5 dB
re: 40 W, 8Ω, A-weighted
1 kHz, 4Ω, all channels driven
1 kHz, 40 W, 8Ω, 80 kHz BW
1 kHz, 60 W, 4Ω, 80 kHz BW
20 Hz-20 kHz, 35W, 8Ω, 80 kHz BW
watts
dB
8Ω, 1 kHz
Drop out 85 VAC (120V unit)
Sealed tunnel, 2-speed
60 W/channel; 4Ω load; all channels driven
Safe Operating Area
10 dB step
10 dB step
@1 kHz
15 dB overdrive (max. level) @ 1 kHz
10 dB step
10 dB step
20log (Vmax/Vout) or 10log (Pmax/Pout)
Independent secondaries for each channel
Internal selection
No load (idle)
60 W/channel; 4Ω load; all channels driven
50 Hz to 15 kHz ±1 dB
Installs internally, 1 per channel, up to 3
UL 6500
C22.2
(8.9 cm x 48.3 cm x 22.9 cm)
(11.8 kg)
(11 cm x 52 cm x 35 cm)
(13.6 kg)
Note: 0 dBu = 0.775 Vrms. *SPiKe is an acronym for Self Peak Instantaneous temperature (Ke) protection circuitry.
Data Sheet-
MA 3
MULTICHANNEL AMPLIFIER
Block Diagram
HEADROOM METER
0 dB
3 dB
6 dB
12 dB
CH 1 LEVEL
CH1 INPUT
VCA
OUT
TRANSFORMER
OPTION
AMP
IN
CH 1 OUTPUT
40 W/8 Ω
60 W/4 Ω
80 Hz HP
MUTE
SERVO
LIMIT
HEADROOM METER
0 dB
3 dB
6 dB
12 dB
CH 2 LEVEL
CH2 INPUT
VCA
OUT
TRANSFORMER
OPTION
AMP
IN
CH 2 OUTPUT
40 W/8 Ω
60 W/4 Ω
80 Hz HP
MUTE
SERVO
LIMIT
HEADROOM METER
0 dB
3 dB
6 dB
12 dB
CH 3 LEVEL
CH3 INPUT
VCA
OUT
TRANSFORMER
OPTION
AMP
IN
CH 3 OUTPUT
40 W/8 Ω
60 W/4 Ω
80 Hz HP
SERVO
LIMIT
FAST
FAN
DRIVE
DC FAN
NORMAL
Application Examples
Two-Channel Direct Drive Left & Right, Third Channel Distributes
with Internal Constant-Voltage Transformer
1
MUTE
2
All Three Channels Distributed to Independent Zones
3
0
0
0
3
3
3
6
6
6
12
12
12
1
POWER
2
0
0
3
3
3
6
6
6
12
12
dB
8Ω
OR
ZONE 1
MONO
POWER
RIGHT
CHANNEL OUTPUT HEADROOM
70 V
70 V
OR
LEFT
POWER
MA 3
MULTICHANNEL
AMPLIFIER
12
dB
CHANNEL OUTPUT HEADROOM
8Ω
3
0
MA 3
MULTICHANNEL
AMPLIFIER
70 V
POWER
70 V
EXPAND
ZONE 2
MONO
DISTRIBUTED
DISTRIBUTED
DISTRIBUTED
DISTRIBUTED
ZONE 1
ZONE 2
ZONE 3
Data Sheet-
MA 3
MULTICHANNEL AMPLIFIER
Rear Panel
MA 3
RANE CORP.
FOR
CONTINUED
GROUNDING
PROTECTION
DO NOT
REMOVE SCREW
120V
50/60 Hz
360 WATTS
OUTPUT POWER
PER CHANNEL
40 WATTS / 8 OHMS
60 WATTS / 4 OHMS
OUTPUTS
N108
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRICAL
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.
AVIS
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
CH 3
CH 2
INPUTS
CH 1
CHANNEL 3
CHANNEL 2
CHANNEL 1
FAN SPEED
MAY USE CLASS 2 WIRING
+ -
+ -
+ -
NORMAL
+
-
+
0
+ -
+ -
+ -
+
-
-
10
LEVEL
+
0
+
-
10
LEVEL
FAST
0
+
-
10
LEVEL
Architectural Specifications
The MA 3 shall be a three channel amplifier. It shall deliver
40 watts continuous average power into 8 ohms and 60 watts
continuous average power into 4 ohms. The amplifier shall have
balanced inputs with Euroblock connectors and Euroblock output connectors capable of accepting 12 gauge wire. Input level
controls shall allow adjustment of input sensitivity. An internal
means of selecting 80 Hz highpass 2nd-order Butterworth filters
shall be provided. Load sensitive limiter circuits shall expand the
dynamic range of the amplifiers and prevent clipping and the
associated loss of speech intelligibility.
The power supply shall use a conventional linear supply with
means of operating from 120 VAC 50/60 Hz or 230 VAC 50
Hz. An IEC connector with integral fuse and IEC cord shall be
utilized. A front panel mounted power switch shall be provided
with “power-on” indicator.
Thermal management shall employ forced air cooling, allowing the amplifiers to operate reliable in unventilated racks at
elevated ambient temperatures. The design shall incorporate a
sealed heat tunnel with large aperture openings and low velocity
air flow to minimize noise and eliminate the need for air filtering
and the associated maintenance.
The design shall provide protection against overvoltage,
undervoltage, overloads, transients from inductive loads, thermal
runaway and instantaneous temperature peaks. Load sensitive
headroom meters shall provide indication of 0, 3, 6 and 12 dB of
remaining headroom.
The main chassis shall be constructed of 12 gauge, coldrolled steel capable of reliably supporting rack mount applications. There shall be a means of installing up to three 40W,
70.7V (or 100 volt) constant-voltage distribution transformers
inside the amplifier with quick connect terminals.
The 120 VAC unit shall be UL listed and cUL certified.
The unit shall be a Rane Corporation Model MA 3.
Available Accessories
• TF 407: 40W, 70.7V Distribution transformer
• TF 410: 40W, 100V Distribution transformer
Both transformers rated 40 watts, 50 Hz to 15k Hz ±1 dB, with 0.5 dB Insertion loss.
Up to 3 mount inside the MA 3, one for each channel. See the TF 407/410 Data Sheet.
References
1. D. Bohn, “Constant-Voltage Audio Distribution Systems,” RaneNote, (2000).
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 USA TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com
Data Sheet-
All features & specifications subject to change without notice. DOC 106715
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