OPERATORS MANUAL |
MA 4 |
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MULTICHANNEL AMPLIFIER |
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ON |
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Limit |
Fault |
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Limit |
Fault |
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Limit |
Fault |
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Limit |
Fault |
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MA 4 |
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Comp |
Load |
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Comp |
Load |
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Comp |
Load |
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Comp |
Load |
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Exp |
Ready |
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Exp |
Ready |
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Exp |
Ready |
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Exp |
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DIGITAL |
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AMPLIFIER |
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dB Headroom |
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dB Headroom |
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dB Headroom |
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dB Headroom |
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Quick Start
Basic MA 4 operation is straightforward:
1.The universal switching power supply works with 100 to 240 VAC, 50/60 Hz.
2.Make sure the front panel power switch is off (the unit consumes 5 watts in standby mode).
3.Connect balanced inputs (rear panel).
4.Set SENSITIVITY controls to +22 (see why on page Manual-2) (rear panel).
5.Turn the Downward EXPander ON (rear panel).
6.Set COMPressor to 10 dB (rear panel).
7.Select the appropriate HIGH PASS filter frequency (20, 40, 60 or 80 Hz on rear panel).
8.Connect speaker loads (rear panel).
9.Make sure you have adequate ventilation around the unit – see Safety Instructions.
10.Turn ON the front panel power switch. You’re good to go!
Metering shows the status of the amplifier at a glance (see page Manual-3). Headroom (with any load), dynamics control, Fault status and Load status are indicated for each channel.
Extra Credit
For remote turn-on, fault reporting and back-up amplifier operations, and remote level control wiring, see page Manual-4. For FAULT FLAG operation (applications and reported faults), see page Manual-3.
MADE IN U.S.A. |
MA 4 |
ACN 001 345 482 |
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OUTPUTS |
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RANE CORP. |
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4 INT |
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3 INT |
Class 2 Wiring |
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1 INT |
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FAULT |
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EXT |
EXT |
2 INT |
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For continued |
COMMERCIAL |
LOAD |
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LOAD |
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LOAD |
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LOAD |
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FLAG |
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grounding |
AUDIO |
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Active Low |
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protection |
EQUIPMENT |
+ – |
+ – |
+ – |
+ – |
+ – |
+ – |
+ – |
+ – |
4 3 2 1 |
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do not remove |
24TJ |
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screw
100-240V |
C |
R |
US |
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LISTED |
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1 |
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50/60 Hz |
500 WATTS |
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+ – |
+ – |
+ – |
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MODE |
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INPUTS |
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HIGH-PASS |
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20Hz |
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REMOTE LEVEL |
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4 |
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3 |
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2 |
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1 |
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40Hz |
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4 |
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1 |
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60Hz |
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SENSITIVITY |
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SENSITIVITY |
SENSITIVITY |
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80Hz |
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COMP |
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Use Rane VR 2 or 20 kΩ pot |
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MASTER |
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SLAVE |
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ON |
Vr |
Vc |
Vr |
Vc |
Vr |
Vc |
Vr |
Vc |
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ON |
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ON |
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22 |
4 |
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22 |
4 |
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4 |
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4 |
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dBu |
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dBu |
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dBu |
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dBu |
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1 2 3 4 |
EXP ON |
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Vr |
Vc |
Vr |
Vc |
Vr |
Vc |
Vr |
Vc |
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SOURCE 1 |
SOURCE 2 |
SOURCE 3 |
SOURCE 4 |
Installation
•No rear mounting hardware required.
•Allow adequate ventilation to keep ambient temperature around the amplifier below 104˚F (40˚C).
•Fan cooled with inset intake on left side and inset exhaust on right side (no filter)
•Amplifier heat load in Btu/hr at 100/240 VAC
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10.2 / 13.3 |
Btu/hr |
All amplifiers in standby |
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112.3 / 95.5 Btu/hr |
All amplifiers on, no signal |
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167 / 139 |
Btu/hr |
All amplifiers driven, pink noise, 12 watts avg. 4:1 crest |
º Note: 1 watt x 3.413 = 1 Btu/hr.
WEAR PARTS: This product contains no wear parts. |
Manual- |
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Description & Operation
•Each channel delivers 100 watts of power into a 4 or 8Ω load (constant power).
ºAverage load impedance is estimated, then used to set the limiter to confine the maximum average power to 100 watts.
•Universal voltage, power-factor-corrected power supply (see figure on data sheet).
ºSwitch-mode power supply operates 100 to 240 VAC, 50 Hz or 60 Hz.
ºUnderand over-voltage protection with inrush current management.
ºThe power supply features an IEC appliance inlet.
ºMust be connected to a grounded mains socket-outlet.
•Class D amplifiers operate at up to 85% efficiency.
ºAmplifiers operate in floating Bridged configuration.
MADE IN U.S.A. |
MA 4 |
ACN 001 345 482 |
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RANE CORP. |
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For continued |
COMMERCIAL |
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grounding |
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AUDIO |
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protection |
EQUIPMENT |
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do not remove |
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24TJ |
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screw |
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C R |
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100-240V |
US |
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LISTED |
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50/60 Hz 500 WATTS |
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ºChannels are not bridgeable.
ºBalanced Inputs accept +22 dBu maximum.
•Rear panel SENSITIVITY controls allow continuous adjustment from +22 dBu to +4 dBu.
ºIntegrated Limiter prevents clipping regardless of input level and sensitivity setting with input levels up to +22 dBu.
ºThe best dynamic range is achieved when all stages in a system clip at the same time. If the signal processing in front of the amplifier clips at +22 dBu, and the amplifier sensitivity is set so that it clips at + 4 dBu, you loose 18 dB of headroom.
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INPUTS |
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REMOTE LEVEL |
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4 |
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3 |
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2 |
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1 |
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3 |
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2 |
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1 |
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SENSITIVITY |
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SENSITIVITY |
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SENSITIVITY |
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SENSITIVITY |
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Use Rane VR 2 or 20 kΩ pot |
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13 |
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Vc |
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Vc |
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Vc |
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Vc |
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22 |
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dBu |
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dBu |
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dBu |
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dBu |
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Vr Vc |
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Vc |
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Vr |
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Vc |
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Vc |
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+ – |
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+ – |
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•REMOTE DC LEVEL control inputs are provided for each channel.
ºAudio taper attenuation with external linear pot (0 dB to –80 dB, –16 dB at center position).
ºClickless mute with switch (use SPST switch; connect Vc to GND to mute).
ºEuroblock connector with strain relief (Vref, Vcontrol, GND).
ºOne pot may control all four channels by daisy-chaining the Vc of the used port to the other three ports.
•The Load-dependent Limiter eliminates voltage and current clipping, ensuring signal integrity and uninterrupted service.
ºThe peak signal detector for the Limiter is oversampled to insure accuracy at any frequency.
ºInstantaneous attack and 3 dB per second decay.
•Average load impedance is estimated and used to determine the Limiter threshold setting.
ºThe front panel Load indicator (see metering) indicates the load status.
ºThe normal impedance range is 2 to 16 Ω. (green Load indicator on).
ºAverage load impedance is estimated over 180 ms and requires a minimum of 3.3 watts averaged over 180 ms.
•A soft-knee COMPressor is enabled (down) or disabled (up) for all channels using the rear panel dipswitch.
ºThe rms threshold is 10 dB below the Limiter threshold.
·Allows full uncompressed operation of typical program material while reducing continuous sine wave power.
·Soft knee span is 10 dB; Ratio is 3:1; Attack is 1.5 seconds; Decay is 3 dB per second.
ºIf the internal amplifier temperature goes above 65˚ C, the compressor is automatically set to the 10 dB setting until the temperature drops below 55˚ C. At normal operating temperatures, the threshold setting follows the dipswitch setting.
•Downward EXPander reduces noise in the absence of signal.
ºThe expander is enabled (down) or disabled (up) for all channels using the rear panel dipswitch.
ºThreshold is –70 dBFS; Ratio is 3:1; Attack time is 50 ms; Gain reduction 10 dB per second.
•20, 40, 60 or 80 Hz HIGH-PASS filters are selected using the rear panel dipswitch.
ºSetting affects all channels.
ºFilters are 12 dB per octave, Butterworth alignment.
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MODE |
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HIGH-PASS |
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20Hz |
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40Hz |
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60Hz |
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80Hz |
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COMP |
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MASTER |
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SLAVE |
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ON |
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ON |
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ON |
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1 |
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3 |
4 |
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1 2 3 4 EXP ON
Manual-
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