Martin Audio MA2.8 User Manual Download | Manualshive

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11

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.

Please contact MARTIN AUDIO for information.

Martin Audio – MA2.8 Power Amplifier

E

NGLISH

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PRINT

GUIDES

CONTENTS

APPLICATIONS GUIDE

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Summary of Contents for MA2.8

Page 1: ...ections 8 5 7 Connecting speakers 11 5 8 Impedance matching MLS switch 13 6 OPERATION MODES 13 6 1 Stereo operation 13 6 2 Tandem mono 13 6 3 Bridged mono 14 6 4 Stereo reverse 14 7 OPERATION 15 7 1 O...

Page 2: ...voltage source such as battery mains source or power supply regardless of whether the amplifier is turned on or off Do not run the output of any amplifier back into another channel s input Do not blo...

Page 3: ...es radio frequency energy and if not used or installed in accordance with these operating instructions may cause interference to other equipment Compliance with the EMC directive does not automaticall...

Page 4: ...es if the amplifier attempts to function above its maximum operating temperature 90 C The indicator first comes on as a warning to either turn down the input level or check the cooling arrangements af...

Page 5: ...drive see page 12 3 Clip limiter switch Turns the clip limiter on and off See page 17 4 Input jack Alternative to using input XLR or for linking inputs with other amplifiers See page 9 5 Input signal...

Page 6: ...ront of the amplifier and that the rear of the amplifier has sufficient space to allow the exhaust to escape If the amplifier is rack mounted do not use covers or doors on the front or rear of the rac...

Page 7: ...ference otherwise a current loop is formed via the signal ground Use the balanced input to avoid hum and interference 5 5 Power consumption There are three ways to define the power current consumption...

Page 8: ...current at 1 8 power or 1 3 power for heavy duty demand like discos etc The heat power can be calculated as the following example If we consider a headroom of at least 9dB and a 4 ohm load on an ampli...

Page 9: ...use the TRS jacks provided on each channel The input circuits also have high enough headroom to accept the maximum output level from virtually any low level signal source Figure 5 Rear panel connecto...

Page 10: ...to the shield at the source The hum and noise rejection for the cable is equivalent to that for a balanced line To minimize hum in the audio use balanced inputs whenever possible Figure 8 Balanced lin...

Page 11: ...rs connected out of polarity can degrade sound quality Keep the speaker cables as short as possible and use a good quality stranded speaker cable Do not use shielded wire such as microphone or guitar...

Page 12: ...positions you are allocating a portion of power from 3000 watts Martin Audio MA2 8 Power Amplifier ENGLISH 12 MA2 8 MLS Switch Position LOAD CONFIGURATION 5dB 4dB 2dB 0dB 16 ohms Stereo 2 channel 160...

Page 13: ...s 2 ohms per channel 6 2 Tandem mono For tandem dual channel single input operation depress the Link switch Both channels can now be driven by a signal at either input connector The output connection...

Page 14: ...is can cause serious damage The recommended minimum nominal impedance for bridged mono is 4 ohms equivalent to driving both channels at 2 ohms Driving bridged loads of less than 4 ohms may cause a the...

Page 15: ...about operating voltage and power consumption Make sure that the switches on the rear panel for operation modes clip limiters and the MLS switches are in the correct position See pages 13 and 14 about...

Page 16: ...setting which has a sensitivity of 0dBu 0 775Vrms for full power in 4 ohms 7 5 Indicators Figure 13 Front panel indicators The two bottom green ON LED s indicate when the power supply and output stag...

Page 17: ...the relevant clip limit switch 2 Some manufacturers of loudspeaker processors do not recommend the use of clip limiters in amplifiers as they tend to upset the tracking of the processor s limiters Ap...

Page 18: ...e short circuit is removed AC mains voltage protection If the AC mains voltage is outside the operational window over or under voltage the power supply will automatically shut down When the mains volt...

Page 19: ...ot only by the design of the power supply and heatsink but also by the use of an alloy chassis making rear rack supports unnecessary in most applications Switch mode power supply SMPS Switch mode powe...

Page 20: ...ess of speaker demands and AC line conditions Minimum Load Switch MLS Thanks to the regulated SMPS the maximum power available for the output stages can be adjusted without increased heat dissipation...

Page 21: ...sts up to 1kV conducted through the cables to the unit Electromagnetic fields up to 3V m radiated on the unit and the cables in the frequency range of 27 500MHz We have extended the tests in two cases...

Page 22: ...ation 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 Please contac...

Page 23: ...remove possible high frequency oscillations from the relevant input Fault The amplifier goes into thermal protection when driven at low level Check that your loudspeaker has not got a short circuit in...

Page 24: ...ts act of God war civil insurrection misuse abuse operation with incorrect AC voltage operation with faulty associated equipment exposure to inclement weather conditions and normal wear and tear Units...

Page 25: ...4 ohms 0 08 POWER MATRIX MLS SWITCH SETTING LOAD CONFIGURATION 5dB 4dB 2dB 0dB 16 ohms Stereo 2 channel 160W 180W 340W 520W 8 ohms Stereo 2 channel 300W 350W 650W 1100W 4 ohms Stereo 2 channel 570W 68...

Page 26: ...ire HP12 3SL England Telephone 44 0 1494 535312 Facsimile 44 0 1494 438669 Web www martin audio com E mail info martin audio com The Martin Experience MARTIN AUDIO L O N D O N Please Click here to ret...

Page 27: ...MARTIN AUDIO L O N D O N The Martin Experience ENGLISH MA2 8 Power Amplifier User s Guide PRINT GUIDES CONTENTS APPLICATIONS GUIDE...

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