Rane MA 3 Manual
dB
CHANNEL OUTPUT HEADROOM
6
6
12
6
12
12
3
3
0
3
2
0
1
0
3
POWER
POWER
MULTICHANNEL AMPLIFIER
MA 3
MULTICHANNEL
AMPLIFIER
MA 3
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or third prong is provided for your safety. If the provided plug does not
fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord and plug from being walked on or pinched particularly at plugs, convenience receptacles, and the point where it exits from
the apparatus.
11. Only use attachments and accessories specified by Rane.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. The plug on the power cord is the AC mains disconnect device and must remain readily operable. To completely disconnect this apparatus from
the AC mains, disconnect the power supply cord plug from the AC receptacle.
16. This apparatus shall be connected to a mains socket outlet with a protective earthing connection.
17. When permanently connected, an all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the electrical installation of the building.
18. If rackmounting, provide adequate ventilation. Equipment may be located above or below this apparatus, but some equipment (like large power
amplifiers) may cause an unacceptable amount of hum or may generate too much heat and degrade the performance of this apparatus.
19. This apparatus may be installed in an industry standard equipment rack. Use screws through all mounting holes to provide the best support.
WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. Apparatus shall not be exposed to dripping
or splashing and no objects filled with liquids, such as vases, shall be placed on the apparatus.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Changes or modifications not expressly approved by Rane Corporation could void the user's authority to operate the equipment.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
WARNING
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
To reduce the risk of electrical shock, do not open the unit. No user
serviceable parts inside. Refer servicing to qualified service personnel.
The symbols shown below are internationally accepted symbols that warn
of potential hazards with electrical products.
This symbol indicates that a dangerous voltage
constituting a risk of electric shock is present within
this unit.
This symbol indicates that there are important
operating and maintenance instructions in the
literature accompanying this unit.
OPERATORS MANUAL
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
QUICK START
Sure, you say, “it’s just a three channel amp, I'm in a hurry
and I don't need to read the manual.” But at least read this little
section so you really know what to expect, and your installation
can go even faster.
Be sure the Amplifier is off before making any connections.
Euroblocks make Amplifier connection easy. They are just like
“snap on” terminal blocks. The balanced Input blocks are threeterminal female connectors. The Output blocks are two-terminal
female connectors.
Driving the MA 3 from a balanced source is recommended.
If you must drive the MA 3 Input with an unbalanced source,
we recommend using a cable that has two conductors plus a
shield, and be sure to keep cable lengths as short as possible (under 10 feet). See the RaneNote, “Sound System Interconnection”
(contained in this booklet).
Nominal speaker loads should be no lower than 4 Ω per
WEAR PARTS: This product contains no wear parts.
Output. If you are running series or parallel combinations, be
sure and check your total load impedance. For constant-voltage
distribution, consider using the optional TF 407 (40 W / 70.7
V) or TF 410 (40 W / 100 V) transformer. Transformers may
be installed inside the MA 3 on any number of output channels
required. If you intend to use constant-voltage distribution transformers, you may want to read the RaneNote “Constant-Voltage
Audio Distribution Systems” (contained in this booklet).
Once Input and Output connections are completed, be sure
all rear panel LEVEL controls are all the way counterclockwise.
Now flip the POWER switch on. After a couple of seconds,
slowly turn up each channels’ LEVEL control to the desired
gain. Maximum yields the most effective dynamic range control
for the built-in Limiter). If all is well, you will hear something
pleasant. If not, re-check connections, put on a better CD, and
read more of the manual.
Manual-1
FRONT PANEL DESCRIPTION
1
2
3
0
0
0
3
3
3
6
6
6
12
12
POWER
MA 3
MULTICHANNEL
AMPLIFIER
12
dB
1
CHANNEL OUTPUT HEADROOM
POWER
2
3
4
 Heat tunnel exhaust vents are located on the left of the unit. Large aperture vent slots are used for low noise. Air is taken in at
the back of the unit and exhausts out the front. When installed in a rack, make sure there is ample room for air to exit. The sealed
heat tunnel design does not require the use of an air filter.
 CHANNEL OUTPUT HEADROOM meters indicate the amount of remaining headroom (how much more signal can be applied before Limiting occurs).
0 dB remaining is indicated by a red indicator. When lit, any additional signal causes the Limiter to operate. It is possible to “compress” the signal as much as 20 dB with very little effect on sound quality. This gives the MA 3 the overload characteristics of a
much larger amplifier, without the use of external compressors. The MA 3 was designed to be driven hard (heavily compressed
signal) so it is not necessary to buy extra power to obtain the headroom required to prevent overload.
3 dB remaining is indicated by a yellow indicator. When lit, 3 dB of additional signal may be applied before Limiting.
6 dB remaining is indicated by a green indicator. When lit, 6 dB of additional signal may be applied before Limiting.
12 dB remaining is indicated by a green indicator. When lit, 12 dB of additional signal may be applied before Limiting.
 POWER: This yellow indicator lights when power is applied to the unit. See  below.
 POWER switch: This control obediently turns the MA 3 on and off every time you poke it with your finger. Poking the top half
of the switch turns the unit on when it is off. Poking the bottom portion of the switch turns the unit off when it it on. All three
channels have turn-on and turn-off muting to reduce switching transients.
Manual-2
REAR PANEL DESCRIPTION
MA 3
OUTPUT POWER
PER CHANNEL
40 WATTS / 8 OHMS
60 WATTS / 4 OHMS
RANE CORP.
FOR
CONTINUED
GROUNDING
PROTECTION
DO NOT
REMOVE SCREW
120V
50/60 Hz
360 WATTS
OUTPUTS
N108
CH 3
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.
+ -
INPUTS
CH 1
CHANNEL 3
+ -
+ -
CHANNEL 2
CHANNEL 1
FAN SPEED
NORMAL
+
-
+
0
AVIS
+ -
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
1
CH 2
MAY USE CLASS 2 WIRING
7
+ -
+ -
2
+
-
-
10
LEVEL
0
+
-
10
LEVEL
FAST
-
+
0
-
+
3
10
LEVEL
4
5
6
 IEC cord socket: This connector accepts a standard IEC line cord (included with 120 V domestic units). Plug this into a grounded AC outlet of 120 VAC (or 230 VAC if the MA 3 is internally wired for 230 V operation).
 OUTPUTS: Connect the speaker(s) to each of the three channels by means of the Euroblock connectors with 18 to 12 AWG
wire. Each Output may have an optional 70.7V or 100V distribution transformer installed inside the MA 3. These optional transformers are 40 watt devices with 0.5 dB insertion loss at rated power and a frequency response of 50 Hz to 15 kHz, ±1 dB. The
70.7 V transformer kit is the TF 407. The 100V transformer kit is the TF 410.
 INPUTS are balanced Euroblock connectors, one for each channel. We recommend the use of at least 18 AWG wire for reliability. Driving the MA 3 from a balanced source is recommended. If you must drive the MA 3 Input with an unbalanced source, we
recommend using a cable that has two conductors plus a shield. Connect the (+) or “hot” source to the MA 3 (+) Input, the ground
to the MA 3 (–) Input and connect the shield to the MA 3 shield input. Do not connect the shield on the source end. Shield connections go directly to chassis ground and should not be used as signal ground. Shield connection to chassis occurs via the screw
found between the Input and Output connectors—keep this screw tight for improved EMI protection. When operating the MA
3 with unbalanced Inputs, be sure to keep cable lengths as short as possible. Refer to the RaneNote “Sound System Interconnection”
(included in this booklet) for additional information.
 LEVEL controls adjust the input sensitivity for each of the three Amplifiers. The internal Limiters have maximum operating
range (most amount of limiting before input overload) when the LEVEL controls are set to maximum. For best system noise performance, the input sensitivity may be reduced to send a “hotter” signal to the Amplifier. Here we go again! You get nothing for
free. There are always tradeoffs to be made (better overdrive capability or lower system noise). The choice depends on your application. For additional information see the RaneNote “Setting Sound System Level Controls” available from our website or upon request
from the factory.
 FAN SPEED: There are two fan speeds. The NORMAL setting (switch out) allows the MA 3 to deliver full rated continuous
average power into 4 ohms, all channels driven, with ambient room temperature of 22°C. Therefore, it is seldom, if ever, necessary
to run the fan at the FAST speed. The exception might be a very hot environment and heavily compressed music into a demanding
load. The only penalty for running the fan at the FAST speed is noise.
 Heat tunnel air intake: The fan draws air in through the finger guard on the rear of the unit. The air flow is directed down a
sealed heat tunnel and exhausts through front panel vents. No filter is required as air flow is directed through an unobstructed,
sealed tunnel and will not contaminate internal circuitry.
 Optional internal transformers: The dotted lines represent areas reserved for the screws and labels that come with internally
mounted transformers. See the next page for more information.
Manual-3
FEATURES & APPLICATIONS
Built to be driven hard
The MA 3 Amplifier drives all three channels at the continuous average rated power, indefinitely. It is specifically designed to
operate in demanding commercial applications. Very low emissions allow the Amplifier to operate in close proximity to signal
processing equipment without causing excessive interference. The
CP 52, CP 64, DA 26 and SRM 66 may all operate next to the
MA 3 in a rack. The high efficiency “heat tunnel” design allows
the Amplifier to process severely compressed signals reliably even
when installed in a rack with elevated ambient temperatures.
Forced air cooling keeps heat away from other equipment.
You won't hear other Zones
The MA 3 is designed to deliver foreground music, background music and paging signals to three different Zones
without annoying crosstalk. A quiet office, for example, with a
paging signal only, will not hear foreground music playing in the
lounge. The high capacity linear power supply incorporates three
independent secondary supplies with independent bridge rectifiers and filters. The result is exceptionally good crosstalk figures
even with multiple channels driving full power into 4 ohm loads.
It’s OK to light the 0 dB Headroom indicator a lot
The high performance Limiter used in the MA 3 means all
the available power can be delivered to the load and not simply
held in reserve to avoid overload. There is no need to buy up to
four times the required power just to prevent occasional system
overload. The MA 3 can compress a signal with 9 dB of dynamic
power range down to a signal with 3 dB of dynamic power without loss of speech intelligibility or excessive distortion.
With typical Amplifiers, when 40 watts is needed to achieve
a required average SPL of 80 dB, the contractor must buy an
Amplifier rated at no less than 160 watts just to maintain 6 dB
of headroom. The figure below illustrates the performance of the
MA 3 Limiter.
No bad “spikes”
The MA 3 is designed to operate without interruption of signal with as little as 85 VAC available (120 VAC unit). Even if the
Amplifier is operating at full power, the signal will not breakup
as the AC line voltage drops to 85 VAC. If the AC line drops
lower than 85 VAC the signal mutes without “spikes.” Once AC
power is restored, the signal restarts quickly without “spikes” or
signal breakup.
The good “SPiKe”
The power Amplifiers in the MA 3 are protected with National Semiconductors’ proprietary SPiKe* protection circuitry.
SPiKe protection offers a level of protection not available in
conventional amplifiers. It has the ability to instantaneously
monitor the temperature of the power device die, yielding a level
of reliability not achievable with discrete designs.
80 Hz Highpass Filters
Internal jumpers allow independently selecting 80 Hz,
2nd-order Butterworth Filters for each channel. These Filters are
useful when using small bookshelf speakers or small constant
voltage distribution transformers. See the enclosed schematic for
locations of these jumpers.
Optional constant voltage distribution transformers
Up to three 70.7 V or 100 V constant voltage distribution
transformers may be mounted inside the MA 3. The optional
TF 407 is a 40 watt, 70.7 V transformer with 0.5 dB insertion
loss at rated power and a frequency response of 50 Hz to 15 kHz,
±1 dB. The optional TF 410 is a 40 watt, 100 V transformer
with .5 dB insertion loss at rated power and a frequency response
of 50 Hz to 15 kHz, ±1 dB. No external wiring or mounting is
required.
MA 3 Limiter
THD+N(%) & LEVEL(W) vs AMPL(dBu)
31 MAR 98 08:52:13
60
55
50
ois
e
45
&N
40
35
D
er
TH
0.1
Pow
THD & Noise in %
1
30
25
Output Power in Watts
2
*Spike is a registered
trademark of National
Semiconductor Corporation. SPiKe is an acronym
for Self Peak Instantaneous (Ke) protection
circuitry.
20
15
0.02
-5
0
5
10
15
10
20
Input Level in dBu
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com
Manual-4
106715
INSTALLATION MANUAL
TF 407 & TF 410
MA 3 TRANSFORMER KITS
Description
Up to three optional 70.7 V or 100 V constant-voltage distribution transformers may be
mounted inside the MA 3 with no external wiring or mounting required.
• The TF 407 is a 40W, 70.7 V transformer with 0.5 dB insertion loss at rated power and a frequency response of 50 Hz to 15 kHz, ±1 dB.
• The TF 410 is a 40W, 100 V transformer with 0.5 dB insertion loss at rated power and a frequency response of 50 Hz to 15 kHz, ±1 dB.
Installation WARNING — Only authorized service personell should perform this upgrade.
1. Unplug the MA 3 amplifier!
NORMAL
FAST
+ + -
FAN SPEED
+ -
4. Stand the MA 3 up on one end with the power transformer toward the bench (Figure 2).
MAY USE CLASS 2 WIRING
3. Capacitors C63, C61, C62 and C65 need to be laid toward the rear of the unit (Figure 1). Don’t
press on parts, just gently lay them over.
+ -
2. Remove the top cover (12 screws).
LEVEL
LEVEL
+
0
+
+ -
+ -
10
+
-
0
+
CHANNEL 3
LEVEL
10
+
-
0
CHANNEL 1
+
CHANNEL 2
INPUTS
Gently lay capacitors back toward the rear
OUTPUTS
OUTPUT POWER
PER CHANNEL
40 WATTS / 8 OHMS
60 WATTS / 4 OHMS
8. Repeat for additional Channels if more than one transformer is required. When installing more
than one, start at the bottom (Channel 3).
CH 1
2
CH 2
7. With the transformer primary (WHT & BLK) wires facing the PCB, “hang” the transformer on
the #8 screw and nylock nut. Hold the screw and transformer in place with one hand. Use your
other hand to rotate the supplied #8 nut onto the threads. Use a nut driver and #2 Phillips driver
to snug the hardware. Install the second #8 screw and nylock nut. Make sure hardware is tight.
1
CH 3
6. Place one of the two supplied #8 screws in the “top” mounting hole of the pair of holes associated
with the channel receiving the transformer (Figure 2).
The “bottom” two holes are for Channel 3.
The “center” two holes are for Channel 2.
The “top” two holes are for Channel 1.
10
5. Locate the transformer mounting holes along the rear panel of the MA 3 (Figure 2).
Figure 1. Capacitor clearance
Ch 1
Ch 2
Ch 3
AVIS
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
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.
N108
FOR
CONTINUED
GROUNDING
PROTECTION
DO NOT
REMOVE SCREW
120V
50/60 Hz
360 WATTS
MA 3
RANE CORP.
3
Figure 2. Transformer mounting
holes for each channel.
Gently lay capacitors back toward the rear
TF 407 & TF 410
MA 3 TRANSFORMER KITS
9. Once the transformers are securely mounted, lay the unit down (never leave the unit
standing on its end unattended).
10. See Figure 3. The + (hot) jumper must be cut when a transformer is installed. The
– (gnd) jumper may be cut for a fully isolated secondary or left in for a ground
referenced secondary. There are two wire jumpers for each Channel:
Ch 1 + (hot) W6
– (gnd) W9
Ch 2 + (hot) W8
– (gnd) W10
Ch 3 + (hot) W13
– (gnd) W14
11. Cut the required jumper(s).
12. Locate the BLK/WHT primary pair. Twist the wires together.
13. Connect the BLK primary wire:
Ch 1: J8
Ch 2: J15
Ch 3: J25
14. Connect the WHT primary wire:
Ch 1: J20
Ch 2: J11
Ch 3: J22
15. Locate the BLK/RED secondary pair. Twist the wires together.
16. Connect the BLK secondary wire:
Ch 1: J10
Ch 2: J14
Ch 3: J21
17. Connect the RED secondary wire:
Ch 1: J9
Ch 2: J16
Ch 3: J17
18. Use the supplied tie raps to “dress” wires along the rear of the chassis and away
from power transformer and circuit board.
19. Place the supplied Label on the outside of MA 3 to indicate the location and type
of transformer installed.
20. Re-install the top cover.
Ch 1
Ch 2
Ch 3
Figure 3. Jumpers
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com
All features & specifications subject to change without notice DOC 103209
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