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

Rane MA 3 Amplifier Data Sheet
DATA SHEET
MA 3
MULTICHANNEL AMPLIFIER
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 8 ohms and 60 watts into 4 ohms. 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 4 ohm 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 / Ch. Continuous Average Power into 4 ohms 20-20k Hz
40W / Ch. Continuous Average Power into 8 ohms 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
Three Optional Internal 70.7 V or 100 V Distribution Transformers
UL/cUL Certification
*SPiKe is a registered trademark of National Semiconductor Corporation.
Data Sheet-1
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
min.
min.
ohms
dBu
dBu
min.
dB
±2.5%
Hz
±0.5
dB
min.
watts
+0,-.5dB Hz
min.
dBr
max.
dB
typ.
typ.
typ.
min.
V/µs
min.
typ.
typ.
typ.
max.
typ.
typ.
+0, -2
ms
ms
ms
ms
dB
VAC
typ.
typ.
watts
dB
Conditions/Comments
Each leg
Input required for full power; 8 ohms
20 Hz to 20 kHz
2nd-order butterworth
1 kHz
8/4 ohms cont. avg. power, all ch. driven
re: 40W, 8 ohms, A-weighted
1 kHz, 4 ohms, all channels driven
1 kHz, 40W, 8 ohms, 80 kHz BW
1 kHz, 60W, 4 ohms, 80 kHz BW
20 Hz-20 kHz, 35W, 8 ohms, 80 kHz BW
8 ohms, 1 kHz
Drop out 85 VAC (120V unit)
Sealed tunnel, 2-speed
60 W/ch.; 4 ohm 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/ch.; 4 ohm 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)
*SPiKe is an acronym for Self Peak Instantaneous temperature (Ke) protection circuitry.
Note: 0 dBu = 0.775 Vrms
Data Sheet-2
MA 3
MULTICHANNEL AMPLIFIER
Block Diagram
HEADROOM METER
0 dB
3 dB
6 dB
CH1 LEVEL
12 dB
CH1 INPUT
VCA
TRANSFORMER
OPTION
OUT
AMP
IN
CH1 OUTPUT
80 Hz HP
MUTE
40 W/8 ohms
60 W/4 ohms
SERVO
LIMIT
HEADROOM METER
0 dB
3 dB
6 dB
CH2 LEVEL
12 dB
CH2 INPUT
VCA
TRANSFORMER
OPTION
OUT
AMP
IN
CH2 OUTPUT
80 Hz HP
MUTE
40 W/8 ohms
60 W/4 ohms
SERVO
LIMIT
HEADROOM METER
0 dB
3 dB
6 dB
CH3 LEVEL
12 dB
CH3 INPUT
VCA
TRANSFORMER
OPTION
OUT
AMP
IN
CH3 OUTPUT
80 Hz HP
MUTE
SERVO
LIMIT
DC FAN
FAN
DRIVE
40 W/8 ohms
60 W/4 ohms
FAST
NORMAL
Examples
Two-Channel Direct Drive Left & Right, Third Channel Distributes
with Internal Constant-Voltage Transformer
All Three Channels Distributed to Independent Zones
Data Sheet-3
MA 3
MULTICHANNEL AMPLIFIER
Rear Panel
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.
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.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
Data Sheet-4
All features & specifications subject to change without notice. DOC 105226 PN 10158
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