Rane MA 3 Handleiding
Rane
Mengpaneel
MA 3
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Manual-1
OPERATORS MANUAL MA 3
MULTICHANNEL AMPLIFIER
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 three-terminal 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 Rane Note 110, “Sound System Interconnection” (contained in this booklet).
Nominal speaker loads should be no lower than 4 ohms per 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 RaneNote 136
“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 counterclock-
wise. 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.
WEAR PARTS: This product contains no wear parts.
Manual-2
FRONT PANEL DESCRIPTION
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.
OUTPUT HEADROOM meters indicate the amount of remaining headroom (how much more signal can be applied before
Limiting occurs).
0 dB OUTPUT HEADROOM 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 OUTPUT HEADROOM remaining is indicated by a yellow indicator. When lit, 3 dB of additional signal may be
applied before Limiting.
6 dB OUTPUT HEADROOM remaining is indicated by a green indicator. When lit, 6 dB of additional signal may be
applied before Limiting.
12 dB OUTPUT HEADROOM remaining is indicated by a green indicator. When lit, 12 dB of additional signal may be
applied before Limiting.
PWR: 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-3
REAR PANEL DESCRIPTION
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. 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 connec-
tions 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 RaneNote 110, “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 operat-
ing 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 RaneNote 135 “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 continu-
ous 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 unob-
structed, sealed tunnel and will not contaminate internal circuitry.
Product specificaties
| Merk: | Rane |
| Categorie: | Mengpaneel |
| Model: | MA 3 |
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