Martin Audio Stereo Amplifier MA200Q User Manual

CONTENTS  
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CONTENTS (ENGLISH)  
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CONTENTS MA200Q USER GUIDE  
APPROVALS  
WARNINGS  
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3.2 WARNING  
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3.3 CAUTION  
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3.4 IMPORTANT SAFETY INSTRUCTIONS  
3.5 USER RESPONSIBILITY  
3.5.1 LOUDSPEAKER DAMAGE  
3.5.2 LOUDSPEAKER OUTPUT HAZARD  
3.5.3 RADIO INTERFERENCE  
INTRODUCTION  
4.1 UNPACKING  
4.2 FRONT PANEL  
4.3 REAR PANEL  
REAR PANEL FEATURES  
5.1 GAIN  
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5.2 SENSITIVITY  
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5.3 LINK SWITCH  
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5.4 OPERATING MODES  
5.4.1 STEREO MODE  
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5.4.2 NOTES FOR AMPLIFIER TESTING  
5.4.3 TANDEM MODE  
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5.4.4 BRIDGE MONO MODE  
5.4.5 BRIDGE MONO MODE FEATURES  
INSTALLATION  
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6.1 MOUNTING  
9
6.2 COOLING  
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6.3 OPERATING VOLTAGE  
6.4 GROUNDING  
6.5 POWER CONSUMPTION  
6.5.1 CALCULATION  
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CONNECTIONS  
7.1 INPUT CONNECTIONS  
7.1.1 BALANCED INPUTS  
7.1.2 UNBALANCED INPUTS  
7.2 CONNECTING LOUDSPEAKERS  
OPERATION  
8.1 OPERATION PRECAUTIONS  
8.2 POWERING UP – SOFT START  
8.3 INPUT ATTENUATORS  
8.4 INDICATORS  
PROTECTION FEATURES  
9.1 OUTPUT LIMITER  
9.2 THERMAL PROTECTION  
9.3 VHF PROTECTION  
9.4 SHORT CIRCUIT PROTECTION  
9.5 AC MAINS VOLTAGE PROTECTION  
9.6 DC PROTECTION  
MAINTENANCE  
10.1 TROUBLESHOOTING  
WARRANTY  
10  
11  
12  
SPECIFICATIONS MA200Q  
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9. Connect only to AC power outlets rated 230-240V (or 100-120V), 50-60Hz.  
10. Do not use this amplifier if the mains cable is damaged or frayed, particularly check where the  
mains cable exits the amplifier and the mains plug. Protect the mains cable from being walked  
upon or rolled over by heavy objects.  
11. Only use accessories specified by the manufacturer.  
12. The amplifier is intended to use in a 19” rack. Follow the mounting instructions. When racks with  
wheels are used, use caution to avoid injury from tipping when in motion.  
!
13. Unplug this apparatus during lightning storms or when unused for long periods of time.  
14. Do not connect an amplifier output in parallel or series with any other amplifier’s output. Do not  
connect the amplifier output to any other voltage source, such as a battery, mains outlet, or  
power supply, regardless of whether the amplifier is turned on or off.  
15. Do not run the output of any amplifier back into another amplifier's input.  
16. Refer all servicing to qualified personnel only. Servicing is required when the apparatus has been  
damaged in any way such as:  
Mains cable, or plug is damaged  
Liquid has entered the amplifier  
An object has fallen into the amplifier  
The amplifier has been exposed to rain or moisture  
The amplifier does not operate normally  
The amplifier has been dropped or the enclosure is damaged  
17. Do not remove top or bottom covers. Removal of the cover will expose hazardous voltages.  
There are no user serviceable parts inside and removal may void the warranty.  
18. An experienced person should always supervise inexperienced adults or minors when using  
professional audio equipment.  
3.5  
User responsibility  
3.5.1 Loudspeaker damage  
Your amplifier is very powerful and can be potentially dangerous to both loudspeakers and humans  
alike. Many loudspeakers can be easily damaged or destroyed by overpowering, especially with  
the high power available from a bridged amplifier. Always check the loudspeaker’s continuous  
and peak power capabilities.  
!
Even when using the amplifier’s front panel attenuator to reduce the gain, it is still possible to reach full  
output power, if the input signal level is high enough.  
3.5.2 Loudspeaker output hazard  
Power amplifiers are capable of producing hazardous output voltages. To avoid the risk of electric  
shock, do not touch any exposed loudspeaker wiring, when the amplifier is operating. See page  
12 Connecting loudspeakers.  
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3.5.3 Radio interference  
A sample of this product has been tested and complies with the limits for the European Electro Magnetic  
Compatibility (EMC) directive. These limits are designed to provide reasonable protection against harmful  
interference from electrical equipment. This product uses radio frequency energy and if not used or  
installed in accordance with these operating instructions, may cause interference to other equipment,  
such as radio receivers. Compliance with the (EMC) directive does not automatically guarantee non-  
disturbance of susceptible equipment in close proximity to this amplifier.  
If this amplifier is suspected of causing interference this can be easily checked by powering the amplifier  
on and off and observing the disturbance. The user can correct the interference by one or more of the  
following measures:  
Re - orientate or relocate the receiver's antenna.  
Increase the distance between the amplifier and the effected equipment.  
Connect the mains cable to a socket on a different circuit from that to which the affected unit  
is connected.  
Check if the affected equipment complies with the EMC limits for immunity, (CE-labelled). If  
not, address the problem with the manufacturer or supplier. All electrical products sold in the  
EC must be approved for immunity against electromagnetic fields, high voltage flashes, and  
radio interference.  
Consult your dealer or an experienced radio/TV technician for help  
4
INTRODUCTION  
Thank you for purchasing a Martin Audio power amplifier. This manual contains important information on  
operating your amplifier correctly and safely. Please take some time to read this manual and familiarize  
yourself with the advanced features of this amplifier.  
4.1  
Unpacking  
Each Martin Audio MA series amplifier is built to the highest standard and thoroughly inspected before it  
leaves the factory. After unpacking the unit, examine it carefully for any signs of transit damage and  
inform your dealer if such damage is found. It is suggested that you retain the original packaging so that  
the unit can be repackaged at a future date if necessary.  
Please note that Martin Audio and its distributors cannot accept responsibility for damage to any returned  
product through the use of non - approved packaging.  
4.2  
Front Panel  
8
3
2
5
4
3
2
4
5
7
6
--2410-0681 02C-  
1
d1HB0.AP-07R-O1-C543OTL0NIE-dP-2C14B0-60T18 20C-  
1M  
dH1B0.B-0  
7
A
--15  
3
-
2
-2140-6081  
0
C02-Hd1  
0
B.10CP-07R  
Q
--O-15C34OTL0E-NI1Pd4C-6B081T02C-dH1B0.D1-07---153  
10  
1. Input level attenuators  
These controls are used to set the signal level entering the amplifier. They are calibrated in dB's to assist  
the setup of active loudspeaker systems. (See page 14).  
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2. Protect indicator LED  
This indicator illuminates if the amplifier attempts to function above its maximum operating temperature  
(90°C). The indicator first comes on as a warning, to either turn down the input level or check the cooling  
arrangements, after which point the amplifier will mute the input signal. When the cooling fans have  
returned the output heat sinks back to the normal operating temperature the input signal is un-muted.  
This indicator also illuminates when signals above 12 kHz at full power are detected at the output terminals  
or if the short circuit protection is activated. Should this o c c u r th e in p u t s ig n a l is m u te d , a n d the process  
repeats until the VHF signal is no longer present or the short circuit is removed. (See page 15).  
3. Clip/limit indicator  
This indicator signals when the amplifier output is clipping or limiting. It has two different indication states:  
When the clip limiter is engaged, it has a short time constant and it illuminates briefly. (See page 15).  
When the clip limiter is not engaged, it has an increased time constant and it illuminates for a longer period.  
4. Signal present indicator  
This LED Illuminates at –40dB below full output signal.  
5. On indicator  
The four bottom green ”ON” LED's indicate that the output circuits are receiving the correct rail voltage.  
6. Power switch  
Turns the mains power “ON” or “OFF”.  
(See page 9 and12)  
7. Fan grille filters  
A grille with foam filters is located on the front panel to prevent dust from entering the amplifier. The grille is  
removable for easy cleaning of the filter by simply pulling them off. The foam filter should always be used.  
8. Carry/protection handle  
Both handles can be used to carry the amplifier; they also act as protection for the front panel. In fixed  
installations or where rack front covers are too shallow, they may be removed by unscrewing the retaining  
bolts behind the front panel.  
4.3  
Rear Panel  
1
3
4
4
4
4
3
1
Clip Limi ter  
A
Clip Limiter  
C
CH.D  
CH.C  
INPUTS  
CH.B  
CH.A  
OUTPUTS C,D  
OUTPUTS A,B  
Fixed gain 32 dB  
XLR  
1/ 4“  
Sleeve  
Tip  
Ring  
STERE O  
BR ID G  
E
BR ID GE  
STEREO  
1+ CH.A+ Pin 1+ Spk+  
Pin  
1
Scrn  
Pos  
Pin 1+ Spk+ 1+ CH.C+  
2- Spk- 1- CH.C-  
2+ CH.D+  
1- CH.A-  
2+ CH.B+  
2- CH.B-  
2- Spk-  
2
3
Neg  
2- CH.D-  
Clip Limiter  
B
Clip Limiter  
Made in the EEC by  
D
230-240V  
50-60Hz  
Ser. N:o  
MARTIN AUDIO MA200Q  
Must be grounded  
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5
7
3
9
3
1. Output / Speaker connector  
The Neutrik Speakon connector is used on the outputs of the amplifier a full description can be found in the  
operation section. (See page12).  
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3. Clip limiter switch  
Turns the clip limiter “ON” (switch IN position) or “OFF” (switch OUT position). (See page13).  
4. Input signal XLR.  
The Neutrik Combo jack is used which also features a _” TRS phone jacks. (Pin 2 is “hot”, see page10).  
5. Link switch. Allows a single input to drive channels B and C simultaneously.  
7. Link / bridge switch. Allows a single input to drive channels A and B and / or channels C and D  
simultaneously. Also used for bridged operation of channel pairs (See page 6).  
9. AC Mains cable. WARNING!  
A label just below the mains cable on the rear of the amplifier indicates the selected AC  
mains operating voltage. Connect the mains cable only to the AC source referred to on the  
label.  
!
5
REAR PANEL FEATURES  
5.1  
Gain  
The gain of the MA200Q is fixed at 32 dB.  
5.2  
Sensitivity  
Sensitivity is volts (rms) or dBu (referred to 0.775Vrms) that are required to obtain full output power. As  
the output power varies with the load impedance, the table below lists sensitivity versus load  
configuration.  
Sensi tivity  
Volt rms  
MA200Q  
LOAD CONFIGURATION  
16 ohmsQuad (4 channel)  
8 ohmsQuad (4 channel)  
4 ohmsQuad (4 channel)  
2 ohmsQuad (4 channel)  
dBu  
0 . 4  
0 . 4  
- 0. 8  
- 2. 5  
0 . 81  
0 . 81  
0 . 71  
0 . 58  
16 ohmsStereo ( 2 channels bridged)  
8 ohmsSte reo ( 2 channels bridged)  
4 ohmsSte reo ( 2 channels bridged)  
0 . 98  
0 . 71  
0 . 59  
2 . 1  
- 0. 7  
- 2. 4  
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5.3  
Link switch  
The Link switches located on the rear panel (between the four XLR input connectors) are for c h a n g in g th e  
operating modes of the amplifier. By using a combination of these switches and input /output wiring it is  
possible to have several operating configurations. (See below, section 5.2).  
5.4  
Operating modes  
5.4.1 Stereo mode  
For 2 x stereo, 2 x bi amp or 4 channel (quad)  
use, all channels operate independently of each  
other, and all the link switches are OUT. For a 2 x  
stereo configuration the input designation is CH A  
left input 1, CH B right input 1, CH C left input 2,  
and CH D is right input 2. For 2 x bi amp CH A  
input would be LF1, CH B input HF1, CH C input  
LF2 and CH D input HF2.  
CH.D  
CH.C  
INPUTS  
CH.B  
CH. A  
Fixed gain 32 dB  
1/ 4 “  
Sleeve  
Tip  
Ring  
XLR  
Pin  
1
Scrn  
Pos  
Neg  
2
3
230-240V  
50-60Hz  
Must be grounded  
The attenuators on the front panel will control  
the respective channels levels.  
Never connect either output terminal to ground or in parallel. The recommended minimum  
impedance, for quad or tandem stereo operation, is 2 ohms per channel.  
5.4.2 Notes for amplifier testing  
NOTE: Channels B and D are always polarity reversed on the input, and polarity reversed back  
on the output. On channels B and D outputs, the positive output voltage with respect to 0V  
!
appears on pin -2 of the Speakon connector. Channel A and C outputs are connected with normal  
polarity. By having channel A and B (and C and D) operating in opposite polarity, the energy storage in  
the power supply is more efficient. This is significant for signals below 100 Hz (sub bass etc.) and  
improves the power bandwidth. Be sure to use balanced inputs on all measurement equipment  
(including oscilloscope probes) if you are bench testing.  
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5.4.3 Tandem mode  
In tandem mode two or four of the amplifiers inputs are linked together. To use only one input signal to  
drive inputs A or B press the (A+B link/bridge) switch and connect a signal to inputs A or B.  
In this configuration loudspeaker 1 would then be connected across +1 and -1, and loudspeaker 2 across  
+2 and -2 of the OUTPUT A, B Speakon connector.  
To use only one input signal to drive inputs C and D press the (C+D link/bridge) switch and connect a  
signal to inputs C or D, loudspeaker 3 would be connected across +1 and –1 and loudspeaker 4 across  
+2 and -2 of the OUTPUT C, D Speakon connector.  
To use only one input signal to drive all four channels, press “IN” the A+B link/bridge switch, the C+D  
link/bridge switch, and the link B+C switch.  
All attenuators are active, allowing you to set different levels for each channel. Note that only the inputs  
are connected in parallel. This is NOT a parallel output mode. Never connect either output terminal to  
ground or in parallel.  
You can use the remaining input connectors to parallel off “Daisy-chain” signal to other amplifiers.  
NOTE: Always turn off the Link switches when using the amplifier for dual Bi-amping.  
5.4.4 Bridge mono mode  
Bridge mode is used to deliver increased power to the loudspeakers.  
Using the MA200Q in bridge mode reduces the number of output  
channels from four to two. The nominal impedance of the load must be  
more than 3 ohms. To bridge channels A and B set the A+B link /bridge  
switch to “IN” and use either input connector A or B. Both the A and B  
level attenuators must be in the same position, we recommend they are  
used in the 0dB fully clockwise position. The loudspeaker load will now be  
connected to +1 and -2 on the OUTPUT A, B connector. (+1 should be  
connected to the [+] positive terminal of the loudspeaker and -2 to the [-]  
negative terminal of the loudspeaker) Channels C and D are bridged in  
the same way using the C+D link/bride switch, the output appearing on  
the OUTPUT C, D connector (pins +1 and -2).  
5.4.5 Bridge mono mode features  
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Bridged mono mode combines the power of two channels into one loudspeaker. This results in twice the  
voltage swing, four times the peak power and just less than three times the full power of a single channel.  
This is because the coil is driven with positive voltage at one pole and an equivalent negative voltage at  
the other pole. So, if an 8 ohms load is connected in bridged mode, one channel shares one 4 ohms part  
of the load, and the other channel shares the other 4 ohms part. The power into 4 ohms from an MA200Q  
is 200W. So, the total bridged power into the 8 ohms load will be 2 x 200 = 400W.  
6
INSTALLATION  
6.1  
Mounting  
The amplifier is two rack unit's high (2U) and weighs 13.2Kg (29lbs) and will mount in a standard EIA 19”  
rack. Amplifiers may be stacked directly on top of each other. There is no need for spacing between units.  
If it is the intention to fill a rack with amplifiers, we recommend racking is started from the bottom of the  
rack. It is also recommended that rear supports are used for amplifiers mounted in the middle of the rack,  
especially if used as part of a portable system.  
6.2  
Cooling  
Your amplifier uses a forced air cooling system to maintain a low and even operating temperature. All fan  
cooled MARTIN AUDIO MA Series amplifiers have front to rear cooling. Never try to reverse the airflow,  
as the amplifier needs a pressure chamber between the fans and heat sink, and this only operates in one  
direction of the airflow.  
Make sure that there is an adequate air supply in front of the amplifier, and that the rear of the amplifier  
has sufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do not use covers or  
doors on the front or rear of the rack.  
If the heatsink temperature rises too high, it’s sensing circuit will mute the hot channel. If the power supply  
overheats, another sensing circuit will mute all four output channels, until they cool down to a safe  
operating temperature.  
For installations with a central cooling system, usually found in a dedicated rack room, it may be  
necessary to calculate the maximum heat emission. Refer to Power consumption on page 10.  
Remember! Never rack different makes of amplifier together that have opposing air flow characteristics.  
6.3  
Operating voltage  
WARNING!  
A label just below the mains cable on the rear of the amplifier indicates the selected AC mains  
operating voltage. Connect the mains cable only to the AC source referred to on the label. The  
warranty will not cover damage caused by connecting to the wrong type of AC mains.  
If the power plug is not appropriate for your country, it can be cut off and re-wired to a suitable connector in  
the following way:  
BLACK or BROWN  
WHITE or BLUE  
LIVE  
NEUTRAL  
EARTH  
GREEN or GREEN/YELLOW  
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Once connected to a suitable AC supply, the amplifier can be started with the power switch. When you  
power up the amplifier it takes a couple of seconds to self check (this is known as the "soft start" or "slow  
start" sequence), the fans then blow at high speed before going into "idle". The four bottom green LED’s  
then illuminate to show the amplifier is operational.  
6.4  
Grounding  
There is no ground lift switch or terminal on this amplifier. The signal ground is always floating (lifted), with  
respect to chassis ground via a ground lift resistor. If a potential difference above 0.6V is detected between  
signal ground and chassis earth, a short circuit is automatically introduced between the two, ensuring  
electrical protection. If other equipment or amplifiers within a system should develop an electrical fault to  
earth, the mains fuse on that equipment should rupture due to this automatic system allowing an earth  
current to flow for protection purposes.  
If however you wish to permanently connect the signal ground to chassis earth, connect the XLR-  
connector’s shell lug to pin 1. In the interest of safety never disconnect the earth pin on the mains cable.  
To comply with CE approval (radio interferen c e ) , th e r e is a n A C m a in s filte r . T h is filte r n e e d s th e chassis  
ground for reference, otherwise a current loop is formed via the signal ground.  
Never disconnect (lift) the mains safety earth.  
6.5  
Power consumption  
There are three ways to determine the power/current consumption of the amplifier:  
First, the peak current draw at full power output. Under this condition the amplifier will operate for less  
than 2 minutes before thermally limiting or blowing the mains fuse, and is an unrealistic ‘normal’ use  
condition. To design a mains distribution system based on the current draw at full power would result in  
an over specified system. No music program material requires the full steady state continuous power of  
an amplifier, this operating condition is only valid during amplifier bench testing.  
Second, the maximum expected average current under worst case program material, which is 1/3 of full  
power according to the FTC-standard. At this level normal program music will be in a state of constant  
clip and is therefore the highest power level that can be achieved without completely obliterating the  
program material.  
Lastly, the "normal operating power", as defined by EN 60065 as a measurement level for approval and  
testing to this standard. The normal operating power is measured using pink noise, with an average  
output power equal to 1/8 of full power. The one-eighth power is the maximum level program music can  
be re-played without continuous amplifier clipping, this corresponds to a headroom of only 9dB's, which is  
very low for normal program material.  
MAX OUTPUT POWER  
Power  
MAINS INPUT POWER  
1/3 Power  
note 1  
480  
1/8 Power  
note 2  
300  
Idle  
[W]  
MA200Q  
8 ohms  
4 ohms  
2 ohms  
4x  
4x  
4x  
130  
200  
270  
85  
85  
85  
720  
470  
1065  
740  
note 1 Average power with music as programsource. The amplifier driven to clip level.  
note 2 Normalmusicpower with 9dBheadroom,IECstandard power rating.  
10  
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6.5.1 Calculation  
The current draw can be calculated by dividing the mains input power by the mains voltage.  
We recommend that you design the power distribution for at least the required current at 1/8 power, or 1/3  
power for heavy-duty demands such as concert touring and Industrial music etc.  
The heat power can be calculated as following:  
If a headroom figure of at least 5dB (1/3 full power) is used with a 4 ohms load on all four channels of the  
amplifier.The 1/3 power per channel is then; 200 / 3 = 67 watts, and total output power is; 4 x 67 = 267  
watts.  
The mains power consumption from the chart above is 720 watts.  
The heat power produced is the difference between the power consumption and output power;  
720 - 267 = 453 watts total for the amplifier.  
MA200Q HEAT POWER  
1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER  
WATTS  
235  
Kcal/hour  
200  
320  
BTU/hour  
800  
1260  
8 Ohm  
4 Ohm  
2 Ohm  
307  
453  
705  
260  
390  
610  
1050  
1550  
2410  
370  
605  
520  
2060  
1/3 Power level = Average power with music as programme material (continuous clipping)  
1/8 Power level = Normal operating power with music as programme material (occasional clipping)  
7
CONNECTIONS  
7.1  
Input connections  
7.1.1 Balanced inputs  
The Input connectors are Neutrik combo jacks and incorporate an XLR and _" (6.3mm) jack. They are  
active balanced and wired as below:  
PIN 1  
PIN 2  
PIN 3  
GROUND/SHIELD  
HOT (+)  
COLD (-)  
11  
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The Neutrik Combo jack is wired in parallel with the XLR.  
TIP  
RING  
SLEEVE  
HOT  
COLD  
SHIELD/GROUND  
CH.D  
CH. C  
INPUTS  
CH.B  
CH. A  
The input impedance is high enough (20K ohms  
balanced) to allow ”daisy-chaining”, or multiple parallel  
input connections. The headroom of the input circuits is  
also high enough to accept the maximum output level  
from virtually any low-level signal source. Balanced  
signals are less sensitive to AC hum and radio  
interference. The source impedance should be less  
than1Kohms to avoid high frequency losses in long  
signal cables.  
Fixed gain 32 dB  
XLR  
Pin  
1/ 4 “  
Sleeve  
Tip  
Ring  
1
Scrn  
Pos  
Neg  
2
3
230-240V  
50-60Hz  
Must be grounded  
7.1.2 Unbalanced inputs  
To connect an unbalanced source, connect pin 3 (ring on TRS jack) to the shield of the connector. If you  
leave one pin disconnected, you will lose 6 dB’s in level.  
A better method of conn e c tin g u n b a la n c e d s o u r c e s is s h o w n in b e lo w . T h is is s im ila r to th e c onnection for  
balanced lines, but pin 3 is connected to the shield at the source. The hum and noise rejection for the cable  
is equivalent to that of a balanced line. To minimize hum in the audio, use balanced inputs whenever  
possible.  
Unbalanced line connection  
Balanced line with unbalanced equipment  
7.2  
Connecting loudspeakers  
Loudspeaker connections are made via the two Neutrik NL4FC Speakon connectors. The Speakon  
connector is designed for high power loudspeaker use and meets all worldwide safety requirements.  
Connections.  
The Speakons are wired:  
Channels A, B output connector  
Pin +1, Pin –1 = Output A  
Pin +2, Pin –2 = Output B  
Channels C, D output connector  
Pin +1, Pin –1 = Output C  
Pin +2, Pin –2 = Output D  
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When outputs A and B, or C and D are bridged, the loudspeaker is connected to +1 and -2 of the  
connector see diagram below.  
Looking at the rear of the amplifier the right hand Speakon has both channel A and B outputs, the left  
hand Speakon channels C and D. This configuration is useful for bridging and bi-amp operation (see  
bridged mono operation on page7).  
chA  
chB  
Bridged mono  
Channel A and B (or C and D) into one  
Speakon. . (Quad or Bi-amp)  
Never connect either output terminal to ground or to some other output or input terminal (see  
warnings in chapter 1)  
For normal four-channel operation, connect each loudspeaker load across the output’s positive and  
negative terminals. Pay attention to loudspeaker polarity; loudspeakers connected out of polarity  
degrade sound quality.  
Keep the loudspeaker cables as short as possible and use good quality stranded cable. Do not use  
shielded wire, such as microphone or guitar cable. Remember that the speaker cable reduces the power  
of the amplifier in two ways:  
It increases the load impedance and introduces resistive power losses.  
WARNING: To prevent electric shock, do not operate the amplifier with any of the  
loudspeaker cable conductors exposed.  
8
OPERATION  
8.1  
Operation precautions  
Make sure that the power switch is set to “OFF ” before connecting any input or output or  
operating the switches on rear panel. See pages 9 about installation.  
Make sure that the AC mains voltage is correct and is the same as the one printed on the rear  
panel of the amplifier. See pages 9 and 10, about operating voltage and power consumption.  
Make sure that the switches on the rear panel for the different operating modes and the clip-  
limiter switches are in the correct position. See page 7 about operating modes and page 14 about  
clip limiters.  
It is always a good idea to turn down the gain controls during power-up, to prevent speaker  
damage in case a high signal is present at the input.  
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8.2  
Powering up – Soft start  
When you power up the amplifier it takes a couple of seconds to self-check. This is known as the "soft-start"  
or "slow-start" sequence. The fans then blow at high speed before going into "idle" and the four bottom  
green LED’s illuminate to show the amplifier is operational.  
8.3  
Input attenuators  
The four input level attenuators on the front panel adjust the signal level for their respective amplifier  
channel’s in all modes of operation. They are calibrated in dB's to help the setting up of active loudspeaker  
systems.  
In bridged m o d e , b o th le v el attenuators must be in the same position, so that the loudspeaker load will be  
shared equally between the channels.  
8.4  
Indicators  
PROTECT  
CLIP  
PROTECT  
CLIP  
-40dB  
ON  
-40dB  
ON  
CH.A  
CH.B  
-10  
CH.C  
CH.D  
-10  
-7  
-10  
-10  
-7  
-7  
-7  
-12  
-16  
-12  
-5 -16  
-3 -20  
-40  
-80  
-12  
-5 -16  
-3 -20  
-40  
-80  
-12  
-5 -16  
-3  
-5  
-3  
-1  
-20  
-40  
-40  
-1  
-1  
-1  
-80  
0
0
0
-8 0  
0
dB  
dB  
dB  
dB  
MA200Q  
The yellow LED's on the front panel indicate if any protection circuits are activated. These are described on  
page 14.  
The Clip/limit LED's indicates when the amplifier output is clipping or limiting. It has two different indication  
states:  
When the clip limiter is engaged it has a short time constant and illuminates briefly.  
When the clip limiter is not engaged it has an increased time constant and illuminates for a longer  
period.  
The “- 40dB” LED’s illuminate when the output signal is greater than -40dB (with 0dB referenced to full  
output power). These LED’s also act as signal present indicators.  
The four bottom green “ON” LED’s indicate when the power supply is operating normaly and the output  
circuits are receiving the correct rail voltage.  
9
PROTECTION FEATURES  
Each Martin Audio MA series amplifier has many advanced protection features, that will protect both the  
amplifier and the loudspeakers connected to it, should a fault condition arise. Under normal us e th e s e  
features are inaudible. All protection circuits operate independently.  
9.1  
Output Limiter  
An output limiter is included to avoid amplifier clipping. When an amplifier is severely overdriven, its output  
waveform is clipped (its peaks are squared off) – reducing the crest factor. In extreme cases, the waveform  
can approach that of a square wave. An amplifier is normally capable of producing far more power under  
these conditions than its normal undistorted rated output power.  
The limiter works by monitoring the output and comparing the distortion produced between the input and  
output of the amplifier. If the distortion exceeds 1%THD for any reason (voltage or current clipping), the  
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limiter reduces the input signal proportionally. Note that, if the signal is distorted or clipped before it reaches  
the amplifier, the clip limiter will not be activated.  
Under normal operation the clip limiter is inaudible. The limiter can be turned “On” or “Off” by pressing the  
relevant clip limit switch. (3 see page 5)  
Some manufacturers of loudspeaker processors do not recommend the use of clip limiters in amplifiers, as it  
can effect the tracking of the processor's limiters.  
If the amplifier is being used without any external limiting, Martin Audio recommend leaving the clip limiters  
switched "ON" (button depressed).  
9.2  
Thermal protection  
When the amplifier is driven very hard into a low impedance load, the cooling fans will run at high speed. If  
these operating conditions continue, the Protect indicator(s) will illuminate indicating that the amplifier is  
about to go into thermal shutdown.  
After five seconds the amplifier will go into thermal protect by muting the input signal. After 15-20 seconds  
the amplifier will have cooled down enough for the amplifier to come out of shutdown and operate as  
normal. If the load conditions remain unchanged the thermal protection will be re - initiated. Thermal  
protection occurs when the heats in k te m p e r a ture reaches 90°C.  
9.3  
VHF protection  
If a signal of more than 12kHz, at full power is detected, which lasts for more than five seconds, the VHF  
protection mutes the input signal. (This is indicated on the front panel (4) by the LED labelled Protect).  
After five seconds the outputs will un-mute and return to normal operation, unless the output signal has  
remained unchanged, in which case the VHF protection will re-initiate.  
9.4  
Short circuit protection  
All Martin Audio MA Series amplifiers are completely short circuit protected. The protection circuit permits  
very high peak currents, but still holds the output devices within the safe operating area. If a short circuit is  
maintained, the channel affected will eventually go into a thermal protect cycle until the short circuit has  
been removed.  
9.5  
AC mains voltage protection  
If the AC mains voltage is outside the operational window (over or under voltage), the power supply will  
automatically shut down. When the mains voltage is above the minimum start voltage and below its  
maximum operating voltage the amplifier will restart.  
The four green ”ON” LED’s indicate when the power supply is operating correctly.  
9.6  
DC protection  
There are two types of DC protection:  
Fuses on the supply branches of each channel.  
DC crowbar protection that shorts the output if more than 10 volts DC is being detected on the  
outputs. Both these circuits come into effect once a DC level is detected on either channel.  
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10 MAINTENANCE  
Under normal use the amplifier should provide years of trouble-free service. The only maintenance  
required by the user is to clean the front grille periodically.  
In some extreme cases it may be necessary for authorized service personnel to clean the inside of the  
amplifier. These conditions usually occur after prolonged use, e.g. in environments using "cracked- oil"  
smoke machines.  
If you are using your amplifier for heavy-duty use i.e. concert touring or industrial music it is  
recommended that you have your amplifier serviced every 3 years, purely as a preventative measure.  
10.1 Troubleshooting  
These are typical things to check if you think your amplifier is faulty  
Fault: No output.  
If the Signal Present (-40dB) is illuminating a signal is entering the amplifier and the likely cause is an  
unsecured Speakon loudspeaker connector, or loose termination.  
Check also that the VHF protection is not activated. If it is, remove possible high frequency oscillations  
from the relevant input  
Fault: The amplifier goes into thermal protection when driven at low level.  
Check that there is no short circuit present at the amplifier's output, e.g. any component in the  
loudspeaker (this can occur when the loudspeaker coil gets hot).  
Fault: The amplifier goes into protection with power indicators off.  
Check that the AC mains voltage is within the amplifier’s operating range, 130-265V@ 230V, and (65-  
135V @ 115V). Over/under-voltage protection may have occurred. If the amplifier is connected by  
mistake to a 3-phase supply, an internal non-resetable fuse or resistor may have blown. The amplifier  
then has to be returned to your supplier for service.  
Fault: The amplifier does not respond even after checking above items.  
In the unlikely event of on a non-user rectifiable fault, return the amplifier to your supplier or an approved  
service centre.  
Martin Audio cannot be held responsible for damage or injury as a result of the top cover being  
removed.  
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11 WARRANTY  
General  
The MA200Q Power amplifier is warranted to be free from defects in components and factory  
workmanship under normal use and service, for a period of three years from the date of original purchase.  
During this warranty period MARTIN AUDIO LTD or it's nominated agents, will undertake to repair, or at  
it's discretion, replace this product at no charge to it's owner, when failing to perform as specified,  
providing the unit is returned undamaged, in it's original packaging, shipping prepaid, to the factory,  
distributor or authorised service facility.  
This warranty shall be null and void, if the product is subjected to:  
1)  
Repair work or alteration by persons other than those authorised by MARTIN AUDIO LTD  
or it's agents.  
2)  
Shipping accidents, act of god, war, civil insurrection, misuse, abuse, operation with incorrect AC  
voltage, operation with faulty associated equipment, exposure to inclement weather conditions and  
normal wear and tear. Units on which the serial number has been removed or defaced will not be  
eligible for warranty service.  
3)  
MARTIN AUDIO LTD shall not be responsible for any incidental or consequential damages, with  
respect to the products warranted.  
MARTIN AUDIO LTD reserve the right to make changes or improvements in design or manufacturing,  
without assuming any obligation to change or improve products previously manufactured.  
This warranty is exclusive and no other warranty is expressed or implied.  
This warranty does not effect your statutory rights.  
International  
Please contact your supplier for this information, as rights and disclaimers may vary from country to  
country.  
Technical assistance and services  
If your Martin Audio product needs repair, contact your Martin Audio dealer or distributor, or contact  
Martin Audio to obtain the location of the nearest dealer or distributor.  
Telephone: +44 (0) 1494 535312  
Fax: +44 (0) 1494 438669  
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12 SPECIFICATIONS MA200Q  
MAXIMUM OUTPUT POWER  
8per Channel  
4per Channel  
2per Channel  
8Bridged  
EIA @1kHz 1%thd  
130W  
FTC 20 – 20kHz @ 0.1% thd  
120W  
180W  
245W  
360W  
490W  
200W  
270W  
400W  
540W  
4Bridged  
MAXIMUM OUTPUT VOLTAGE  
8load  
Peak voltage, no load  
32Vrms  
51Vrms  
POWER REQUIREMENTS  
Operating voltage  
Minimum start up voltage  
Peak inrush current  
230V version  
130 – 265 Vac  
180Vac  
115V version  
65 – 135Vac  
90Vac  
10A  
20A  
MAINS CURRENT DRAW @ 4 Ohms  
Quiescent current (no load)  
1/8th Full power (both channels driven)  
1/3rd Full power (both channels driven)  
Full power (1Khz @1% thd)  
230V version  
0.6Arms  
2.9Arms  
4.5Arms  
7.9Arms  
115V version  
1.2Arms  
6Arms  
9Arms  
16Arms  
DISTORTION  
THD 20Hz – 20KHz 1W to full power  
THD @ 1KHz 1dB below clip  
DIM 30 @ 3dB below clip  
0.05%  
0.01%  
0.008%  
HUM / NOISE  
< - 105dB  
-70dB  
CHANNEL SEPERATION  
OUTPUT IMPEDANCE  
SLEW RATE  
30mΩ  
30VµS  
INPUTS  
Fixed gain dB  
32  
Input Vrms Ref 4for full power  
4 x Single Channel  
0.71  
Impedance  
20KDifferential  
10KSingle ended  
c.m.r.r.  
50dB  
DIMENSIONS  
(W) 483mm x (H) 88mm x (D) 325mm  
(W) 19ins x (H) 3.5ins x (D) 12.8ins  
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WEIGHT  
13.2Kg (29Ibs)  
SHIPPING DIMENSIONS  
SHIPPING WEIGHT  
(W) 560mm x (H) 180mm x (D) 500mm  
(W) 22ins x (H) 7.1ins x (D) 19.7ins  
14.8Kg (32.5lbs)  
Front Panel  
Gain controls  
Indicators Protect  
Indicators Clip  
Indicators Signal Present  
4 x 31 Position detent  
4 x Yellow LED’s  
4 x Red LED’s  
4 x Green LED’s  
Rear Panel  
Input Connectors  
Output Connectors  
Clip Limiters  
4 x Neutrik Combo, + 3 pin Phoenix  
2 x Neutrik Speakons  
Push Switch “ON”/ ”OFF” per Channel  
A+B, C+D, B+C  
Input Link switches  
Speakon and CombÁ jack, are registered Trademarks of Neutrik AG Liechtenstein.  
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