Table of Contents
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CONTENTS
CONTENTS (ENGLISH)
1
UNPACKING
2
WARNINGS
3
USER RESPONSIBILITY
3.1
Speaker damage
3.2
Shock hazard
3.3
Radio interference
4
INTRODUCTION
4.1
Front panel
4.2
Rear panel
5
INSTALLATION
5.1
Mounting
5.2
Cooling
5.3
Operating voltage
5.4
Grounding
5.5
Power consumption
5.6
Input connections
5.7
Connecting speakers
5.8
Impedance matching (MLS switch)
6
OPERATION MODES
6.1
Stereo operation
6.2
Tandem mono
6.3
Bridged mono
6.4
Stereo reverse
7
OPERATION
7.1
Operation precautions
7.2
Powering up - Soft start
7.3
Input attenuators
7.4
Gain switch
7.5
Indicators
8
PROTECTION FEATURES
9
DESIGN FEATURES
10
SPECIFICATIONS
11
APPENDIX A
12
MAINTENANCE
13
WARRANTY
14
TECHNICAL SPECIFICATIONS
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The Martin Experience
Martin Audio – MA4.2 Power Amplifier
APPLICATIONS GUIDE
MARTIN AUDIO
L O N D O N
GUIDES
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Related Manuals for Martin Audio MA4.2
Summary of Contents for Martin Audio MA4.2
- Page 1 Operation precautions Powering up - Soft start Input attenuators Gain switch Indicators PROTECTION FEATURES DESIGN FEATURES SPECIFICATIONS APPENDIX A MAINTENANCE WARRANTY TECHNICAL SPECIFICATIONS MARTIN AUDIO L O N D O N The Martin Experience Martin Audio – MA4.2 Power Amplifier...
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Page 2: Unpacking
Electrical Safety EN60065:1993 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. -
Page 3: User Responsibility
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. Martin Audio – MA4.2 Power Amplifier... -
Page 4: Introduction
GUIDES APPLICATIONS GUIDE 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. -
Page 5: Rear Panel
6. Polarity reverse switch for channel B For reversing the input signal polarity of channel B to allow bridged operation. (See page 13). 7. Input link switch Allows a single input to drive both channels simultaneously. (See page 13). Martin Audio – MA4.2 Power Amplifier... -
Page 6: Installation
Cooling Your amplifier uses forced air cooling to maintain a low and even operating temperature. All MARTIN AUDIO MA Series amplifiers have front to rear cooling. Never try to reverse the air flow, as the amplifier needs a pressure chamber between the fans and heat sink and this only operates in one direction of the air flow (see Design features on page 19). -
Page 7: Grounding
PRINT GUIDES APPLICATIONS GUIDE MARTIN AUDIO switch mode amplifiers use primary switching, i.e. the mains is rectified directly before the transformer, which means that the power supply is insensitive to the mains frequency and will operate from DC to 400Hz. - Page 8 The power consumption according to the chart above is then 1300 watts. The heat power produced is the difference between the power consumption and power output; 1300 - 525 = 775 watts per amplifier. Martin Audio – MA4.2 Power Amplifier...
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Page 9: Input Connections
INPUT CH.B CH.A Mono Bridge 1/4" Pin 1 Sleeve Ring 230V AC 40-440Hz Must be grounded Figure 5. Rear panel connectors Martin Audio – MA4.2 Power Amplifier... - Page 10 To minimize hum in the audio, use balanced inputs whenever possible. Unbalanced Output Amplifier Input Signal Grounded Shield Amplifier Input Unbalanced Output – – Figure 8. Balanced line with unbalanced equipment Martin Audio – MA4.2 Power Amplifier...
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Page 11: Connecting Speakers
Do not use shielded wire, such as microphone or guitar cable. Remember that the speaker cable robs the power of the amplifiers in two ways: It increases the load impedance and introduces resistive power losses. Martin Audio – MA4.2 Power Amplifier... -
Page 12: Impedance Matching (Mls Switch)
MA4.2 into 2 ohms without increased heat loss. As stated earlier the MA4.2 can produce at least 2000 watts into any impedance between 2 and 8 ohms. Utilise higher MLS™ positions when connecting to lower impedances as shown in Table 2. -
Page 13: Operation Modes
Speakon to speaker negative terminal. Do not connect either of the -1 (negative) pins of the Speakons. Do not connect speakers to channel A or B in the normal manner in bridge mode, as this can cause serious damage. Martin Audio – MA4.2 Power Amplifier... -
Page 14: Stereo Reverse
+1 on channel B Speakon to speaker negative terminal and pin -1 on channel B to speaker positive terminal. – CH A – – LINK PHASE INVERT – CH B – – Figure 12. Stereo reverse mode Martin Audio – MA4.2 Power Amplifier... -
Page 15: Operation
On the other hand, for a disco mixer that operates at a nominal level of 0dBu, use the upper position setting, which has a sensitivity of 0dBu (0.775Vrms) for full power in 4 ohms. Martin Audio – MA4.2 Power Amplifier... -
Page 16: Indicators
* When the clip limiter is not engaged it has an increased time constant and illuminates for a longer period. The remaining yellow "Protect" LED's indicate if the temperature or VHF protection circuits are activated. These are described on page 17. Martin Audio – MA4.2 Power Amplifier... -
Page 17: Protection Features
Apart from this one exception, MARTIN AUDIO recommend leaving the clip limiters switched "on" (button depressed). As a by-product, when the amplifier comes out of a protect condition, the output level has a slow rise time - the effect is like turning the gain up slowly. - Page 18 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 their safe operating area. If a short circuit is maintained, the channel affected will eventually go into a thermal protect cycle until the short circuit is removed.
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Page 19: Design Features
AC line voltage falls by more than 20%! Efficiency is also assured, and in the case of the MA4.2 this is especially apparent; its power supply draws only 6kW and yet it produces 2 x 2100W. - Page 20 Traditional PSU's can behave erratically at low frequencies, particularly under clip conditions with the rise in their output impedance producing uncontrollable speaker cone movement. MARTIN AUDIO SMPS produces its rated power output at all frequencies regardless of speaker demands and AC line conditions.
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Page 21: Specifications
GUIDES APPLICATIONS GUIDE SPECIFICATIONS Safety approvals MARTIN AUDIO MA Series amplifiers are designed to meet EN60065 electrical safety standards. EMC approvals EMC stands for Electro Magnetic Compatibility. This implies that the equipment should have low emission of radio frequencies, directly as electromagnetic fields in the air and as conducted from the cables from and to the unit. -
Page 22: Appendix A
GUIDES APPLICATIONS GUIDE APPENDIX A Mains voltage selection All Martin Audio MA Series amplifiers are normally shipped for 230 Volt AC operation only. For use on 115 Volts AC, internal modifications to the power supply board must be made. Warning: This modification should only be carried out by an experienced service technician. -
Page 23: Maintenance
In the unlikely event, that there is a non-user rectifiable fault, return the amplifier to your supplier or an approved service centre. Martin Audio Ltd cannot be held responsible for damage or injury, as a result of the top cover being removed. -
Page 24: Warranty
APPLICATIONS GUIDE WARRANTY General The MA4.2 Powered Amplifier is warranted to be free from defects in components and factory workmanship under normal use and service, for a period of one year from the date of original purchase. During the warranty... -
Page 25: Technical Specifications
(W) 483mm x (H) 88mm x (D) 347mm (W) 19ins x (H) 3.5ins x (D) 13.7ins WEIGHT 10Kg (22lbs) SHIPPING DIMENSIONS (W) 560mm x (H) 190mm x (D) 500mm (W) 22.4ins x (H) 7.6ins x (D) 20ins SHIPPING WEIGHT 12Kg (26.4lbs) Martin Audio – MA4.2 Power Amplifier... -
Page 26: Power Amplifier
< > CONTENTS PRINT GUIDES APPLICATIONS GUIDE MA4.2 Power Amplifier Please Click here to return to main menu Please Click here to visit our website MARTIN AUDIO L O N D O N The Martin Experience Century Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire HP12 3SL, England. - Page 27 < > CONTENTS PRINT GUIDES APPLICATIONS GUIDE MA4.2 Power Amplifier User’s Guide ENGLISH MARTIN AUDIO L O N D O N The Martin Experience...