Martin Audio MA4.2s User Manual (English)

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Martin Audio – MA4.2s (ETL) Amplifier

ENGLISH

CONTENTS (ENGLISH) Page No

1 CONTENTS MA 4.2s USER GUIDE 1

2APPROVALS 2

3WARNINGS 2

3.1 EXPLANATION OF GRAPHICAL SYMBOLS 2

3.2 WARNING 2

3.3 CAUTION 2

3.4 IMPORTANT SAFETY INSTRUCTIONS 2

3.5 USER RESPONSIBILITY 3

3.5.1 LOUDSPEAKER DAMAGE 3

3.5.2 LOUDSPEAKER OUTPUT HAZARD 3

3.5.3 RADIO INTERFERENCE 3

4 INTRODUCTION 4

4.1 UNPACKING 4

4.2 FRONT PANEL 4

4.3 REAR PANEL 5

5 REAR PANEL FEATURES 6

5.1 GAIN SWITCH 6

5.1.1 GAIN 6

5.1.2 SENSITIVITY 6

5.1.3 OPTIONS 7

5.2 LINK SWITCH 7

5.3 OPERATING MODES 7

5.3.1 STEREO MODE 7

5.3.2 NOTES FOR AMPLIFIER TESTING 7

5.3.3 TANDEM MODE 7

5.3.4 BRIDGE MONO MODE 8

5.3.5 BRIDGE MONO MODE FEATURES 8

5.4 IMPEDANCE MATCHING (MLS SWITCH) 8

5.4.1 THE MLS TECHNOLOGY 9

5.4.2 THE PROBLEM 9

5.4.3 THE SOLUTION 9

6 INSTALLATION 10

6.1 MOUNTING 10

6.2 COOLING 10

6.3 OPERATING VOLTAGE 10

6.4 DENMARK 10

6.5 SWITZERLAND 10

6.6 GROUNDING 11

6.7 POWER CONSUMPTION 11

6.7.1 CALCULATION 11

7 CONNECTIONS 12

7.1 INPUT CONNECTIONS 12

7.1.1 BALANCED INPUTS 12

7.1.2 UNBALANCED INPUTS 13

7.2 CONNECTING SPEAKERS 13

8 OPERATION 14

8.1 OPERATION PRECAUTIONS 14

8.2 POWERING UP – SOFT START 14

8.3 INPUT ATTENUATORS 14

8.4 INDICATORS 15

9 PROTECTION FEATURES 15

9.1 OUTPUT LIMITER 15

9.2 THERMAL PROTECTION 15

9.3 VHF PROTECTION 15

9.4 SHORT CIRCUIT PROTECTION 16

9.5 AUTOMATIC FUSE SAVER, AFS - LIMITER 16

9.6 AC MAINS VOLTAGE PROTECTION 16

9.7 THE "AC" LED 16

9.8 D.C. PROTECTION 16

10 MAINTENANCE 17

10.1 TROUBLESHOOTING 17

11 WARRANTY 18

12 SPECIFICATIONS MA4.2s 19

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Martin Audio MA4.2s Specifications

Power Output

max output power at 8 ohms per channel	1300 W
max output power at 4 ohms per channel	2300 W
max output power at 2 ohms per channel	2900 W
max output power at 8 ohms bridged	4600 W
max output power at 4 ohms bridged	5800 W

Voltage

max output voltage at 8 ohms load	102 Vrms
peak voltage, no load	145 V
operation voltage	130-270 V
full output power	180-260 V
min start voltage	175 V

Current

peak inrush current	5 A
quiescent power no load	0.6 A rms
1/8 of full power at 4 ohms/230V	6 A rms
1/3 of full power at 4 ohms/230V	14 A rms
at full power at 4 ohms/230V	26 A rms

Weight and Dimensions