Martin Audio – MA4.2s (ETL) Amplifier
E
NGLISH
1
CONTENTS (ENGLISH)
Page No
1
CONTENTS MA 4.2s USER GUIDE
1
2
APPROVALS
2
3
WARNINGS
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
All material © 2007. Martin Audio Ltd. Subject to change without notice.
