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 – MA2.8 Power Amplifier
APPLICATIONS GUIDE
MARTIN AUDIO
L O N D O N
GUIDES
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Related Manuals for Martin Audio MA2.8
Summary of Contents for Martin Audio MA2.8
- 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 – MA2.8 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 – MA2.8 Power Amplifier... -
Page 4: Introduction
APPLICATIONS GUIDE GUIDES 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
Allows a single input to drive both channels simultaneously. (See page 13). 8. Gain select switch Allows amplifier gain to be switched between 32dB (1.55Vrms input sensitivity) and 38dB gain (0.775mV input sensitivity). (See page 16). 9. AC power cable (See page 6). Martin Audio – MA2.8 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
It also corresponds to headroom of 9dB, which is very low for normal program material. If operating the amplifier into a sustained 2 ohm load, protection circuits within the amplifier will limit the long-term current draw, and thermal protection may occur. Martin Audio – MA2.8 Power Amplifier... -
Page 8: Input Connections
Both inputs are balanced on 3 pin XLR type connectors and wired pin 2 hot, pin 3 cold, pin 1 ground/shield: PIN 1 SIG. GROUND/SHIELD PIN 2 HOT (+) PIN 3 COLD (-) – SIG. GND. Figure 3. XLR input connector pin-out Martin Audio – MA2.8 Power Amplifier... - Page 9 INPUT CH.A CH.B Mono Bridge 1/4" Pin 1 Sleeve Ring 230V AC 40-440Hz Must be grounded Figure 5. Rear panel connectors Martin Audio – MA2.8 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 – MA2.8 Power Amplifier...
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Page 11: Connecting Speakers
MA2.8 into 2 ohms without increased heat loss. As stated earlier the MA2.8 can produce at least 1100 watts into any impedance between 1.5 and 8 ohms. Utilise higher MLS™ positions when connecting to lower impedances as shown in Table 2. - Page 12 3 for initial starting positions. The amplifier is very well protected (even down to 0.3 ohms). The MA2.8 amplifier is a power converter and when you select MLS™ positions you are allocating a portion of power from 3000 watts.
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Page 13: Operation Modes
Do not use the remaining XLR and TRS connectors for mixing or other purposes. Both level attenuators are active, allowing you to set different levels for each channel. Never connect either output terminal to ground or in parallel. Martin Audio – MA2.8 Power Amplifier... -
Page 14: Bridged Mono
Link switch, you also depress the Phase reverse switch, as in the Bridge mono. Channel B is now phase reversed. To compensate for that, connect pin +1 on channel B Speakon to speaker negative terminal and pin -1 on channel B to speaker positive terminal. Martin Audio – MA2.8 Power Amplifier... -
Page 15: Operation
This is known as the "soft start" or "slow start" sequence. The fans then blow at high speed before going into "idle" and the two bottom green LED's illuminate to show the amplifier is operational. Martin Audio – MA2.8 Power Amplifier... -
Page 16: Input Attenuators
* 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 – MA2.8 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 MA2.8 this is especially apparent; its power supply draws only 4kW and yet it produces 2 x 1400W. - Page 20 Figure 14. Current-voltage characteristic of different power supply topologies. 1) Conventional power supply shows voltage drop due to internal resistance. 2) Regulated power supply used by MARTIN AUDIO. 3) Unregulated switch mode power supply with current limiting. 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.
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Page 21: Specifications
APPLICATIONS GUIDE GUIDES 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
APPLICATIONS GUIDE GUIDES 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
GUIDES WARRANTY General The MA2.8 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 period, MARTIN AUDIO LTD or its nominated agents, will undertake to... -
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 – MA2.8 Power Amplifier... - Page 26 < > APPLICATIONS GUIDE CONTENTS PRINT GUIDES MA2.8 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 APPLICATIONS GUIDE GUIDES MA2.8 Power Amplifier User’s Guide ENGLISH MARTIN AUDIO L O N D O N The Martin Experience...