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Martin Audio – MA1.3s Amplifier

E

NGLISH

9

the fans then blow at high speed before going into "idle". The two bottom green LEDís then illuminate to show the
amplifier is operational.

6.4 Denmark:

National deviation concerning installation of the MA1.3s:
Danish safety regulation only permits the use of an 8A main fuse. As the MA 1.3s uses an internal primary mains
fuse of 15A, the MA1.3s must be equipped with an industrial mains connector rated for 16A or above, or as an
alternative it can be hard wired to a 16A capacity circuit and breaker.

6.5 Grounding

There is no ground lift switch or terminal on this amplifier. The signal ground is always floating via a resistor to
chassis and the grounding system is automatic. If a potential difference above 0.6V is detected between signal
ground and chassis ground, 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-connectorís 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 interference), there is an AC mains filter. This filter needs the chassis ground for
reference, otherwise a current loop is formed via the signal ground.

Never disconnect (lift) the mains safety earth

.

6.6 Power 

consumption

There are three ways to determine the power/current consumption of the amplifier:

First

, the peak current draw at full output power. Under this condition the power amplifier will operate for less than

2 minutes before thermally limiting or blowing the mains fuse, and is an unrealistic ënormalí use condition. To
design a mains distribution system based on the current draw at full power would result in an over specified
system. No programme material requires the full steady state continuous power of an amplifier. This operating
condition is only used for 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 the music will be in a state of constant clip and is therefore the highest
power level that can be obtained without completely obliterating the program material.

Last

, the "normal operating power", as defined by EN 60065, IEC 65/ANSI/UL 6500 as a measurement level for

approval and testing to these standards. 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 music can be re-
played without continuous amplifier clipping; this corresponds to headroom of only 9dBs, which is very low for
normal program material.

6.7 Calculation

The current draw

 can be calculated by dividing the mains input power by the mains voltage.

Power

1/3 Power

1/8 Power

Idle

[W]

note 1

note 2

MA1.3s

8 ohms

2x

350

630

400

110

4 ohms

2x

650

1120

700

110

2 ohms

2x

1100

1975

1185

110

note 1

Average power with music as program source. The amplifier driven to clip level.

note 2

Normal music power with 9dB headroom, IEC standard power rating.

MAX OUTPUT POWER

All material © 2007. Martin Audio Ltd. Subject to change without notice.

CONTENTS

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GUIDES

Summary of Contents for MA1.3s

Page 1: ...M MODE 7 5 3 4 BRIDGE MONO MODE 7 5 3 5 BRIDGE MONO MODE FEATURES 7 6 INSTALLATION 8 6 1 MOUNTING 8 6 2 COOLING 8 6 3 OPERATING VOLTAGE 8 6 4 DENMARK 9 6 5 GROUNDING 9 6 6 POWER CONSUMPTION 9 6 7 CALC...

Page 2: ...ons 1 Keep this manual for future reference 2 Do not operate the amplifier if liquid ingress is suspected 3 Do not stand water or any other liquid on or near the amplifier 4 Do not use this amplifier...

Page 3: ...the amplifier s front panel attenuator s 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 ar...

Page 4: ...he signal level entering the amplifier They are calibrated in dB s to assist the setup of active loudspeaker systems See page 12 3 Protect indicator LED This indicator illuminates if the amplifier att...

Page 5: ...s hot see page 10 4 Link Input XLR male connector connected in parallel to the female for linking the channel to another input 5 Gain switch channel B Three of the switches in the DIP switch selects t...

Page 6: ...power output 1 thd 1KHz sine wave 5 1 3 Options As the DIP switch is recessed a sticker can be placed across the cut out to prevent unauthorized tampering Another option is to remove the DIP switch T...

Page 7: ...edance of the load must be more than 3 ohms Set the Link bridge switches to the ON position UP and use either of the input connectors A or B You can use the remaining input connectors to carry a paral...

Page 8: ...he heat sink temperature rises too high sensing circuits will mute the hot channel If the power supply overheats another sensing circuit will mute both output channels until they cool down to a safe o...

Page 9: ...rmine the power current consumption of the amplifier First the peak current draw at full output power Under this condition the power amplifier will operate for less than 2 minutes before thermally lim...

Page 10: ...EAT POWER 1 3 POWER 1 8 POWER 1 3 POWER 1 8 POWER 1 3 POWER 1 8 POWER WATTS Kcal hour BTU hour 8 Ohm 397 313 340 270 1350 1070 4 Ohm 687 538 590 460 2340 1840 2 Ohm 1242 910 1070 780 4240 3110 1 3 Pow...

Page 11: ...connected you will lose 6 dB A better method for using unbalanced sources is shown in Figure 8 This is similar to the connection for balanced lines but pin 3 is connected to the shield at the source T...

Page 12: ...g voltage and power consumption Make sure that the operating mode switches on the rear panel gain link bridge and clip limiters are in the correct position See page 6 about operating modes page 13 abo...

Page 13: ...f 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...

Page 14: ...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...

Page 15: ...nt 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 an...

Page 16: ...wer both channels driven 5 0 Arms 10 Arms 1 3rd Full power both channels driven 8 0 Arms 16 Arms Full power 1Khz 1 thd 14 0Arms 28 0 Arms DISTORTION THD 20Hz 20KHz 1W to full power 0 07 THD 1KHz 1dB b...

Page 17: ...tors Clip 2 x Red LED s Indicators Signal Present 2 x Green LED s Rear Panel Input Connectors 2 x Neutrik Combo 3 pin Phoenix Output Connectors 2 x Neutrik Speakons Clip Limiters Push Switch ON OFF pe...

Page 18: ...gland Telephone 44 0 1494 535312 Facsimile 44 0 1494 438669 Web www martin audio com E mail info martin audio com The Martin Experience Please Click here to return to main menu Please Click here to vi...

Page 19: ...The Martin Experience ENGLISH MA1 3s Amplifier User s Guide All material 2007 Martin Audio Ltd Subject to change without notice CONTENTS PRINT GUIDES...

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