Martin Audio MA4.2 Specifikace

Martin Audio – MA4.2 Power AmplifierCONTENTS (ENGLISH) Page No1 UNPACKING 22 WARNINGS 23 USER RESP

Do not use XLR and TRS jacks on the same channel simultaneouslyfor mixing or other purposes.Figure 6. Balanced lineTo use an unbalanced source, connec

5.7 Connecting speakersSpeaker connections are made via the two Neutrik NL4FC Speakonconnectors (1). These connectors meet the EC safety requirements.

5.8 Impedance matching (MLS switch)The MLS™ switches (2) are located on the rear panel. The MLS (Minimumload select) switches offer impedance matching

Figure 10. MLS switches on rear panel6 OPERATION MODES6.1 Stereo operationFor stereo (dual channel) operation, leave the Link and Phase reverseswitche

The recommended minimum nominal impedance for bridged mono is 4 ohms (equivalent to driving both channels at 2 ohms). Driving bridgedloads of less th

Channel A output is connected as in the normal stereo mode. By havingchannel A and B operating in opposite polarity, the energy storage in thepower su

7.5 IndicatorsFigure 13. Front panel indicatorsThe two bottom green "ON" LED's indicate when the power supply andoutput stage is operat

8 PROTECTION FEATURES Each MARTIN AUDIO MA Series amplifier has many advanced protectionfeatures that will protect both the amplifier and the speakers

VHF protectionIf a signal of more than 12kHz, at full power, is detected at the amplifieroutputs and lasts for more than five seconds, the VHF protect

9 DESIGN FEATURES CoolingMARTIN AUDIO MA Series amplifiers run very cool due to a patented heatexchanger. The bi-polar output devices are mounted dire

1 UNPACKINGEach Martin Audio MA Series amplifier is built to the highest standard andthoroughly inspected before it leaves the factory. After unpackin

Figure 14. Current-voltage characteristic of different power supply topologies.1) Conventional power supply shows voltage drop due to internal resista

10 SPECIFICATIONS Safety approvalsMARTIN AUDIO MA Series amplifiers are designed to meet EN60065electrical safety standards. EMC approvalsEMC stands f

11 APPENDIX A Mains voltage selectionAll Martin Audio MA Series amplifiers are normally shipped for 230 Volt ACoperation only.For use on 115 Volts AC,

12 MAINTENANCE Under normal use the amplifier should give years of trouble free service.The only user maintenance required from the user is to vacuum

13 WARRANTY GeneralThe MA4.2 Powered Amplifier is warranted to be free from defects incomponents and factory workmanship under normal use and service,

14 TECHNICAL SPECIFICATIONSMA4.2INPUT IMPEDANCE 20kohms (balanced) 10kohms single endedGAIN SELECT SWITCH 41dB (I/P sens 0.775V), 32dB (I/P sens 2.26V

MA4.2 Power AmplifierCentury Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire HP12 3SL, England. Telephone: +44 (0)1494 535

MARTIN AUDIOLONDONThe Martin ExperienceENGLISHMA4.2 Power AmplifierUser’s GuideCONTENTS<PRINTGUIDES>APPLICATIONS GUIDE

3 USER RESPONSIBILITY3.1 Speaker damageMany loudspeakers can be easily damaged or destroyed by overpowering,especially with the high power available f

4 INTRODUCTIONThank you for purchasing a MARTIN AUDIO power amplifier. This manualcontains important information on operating your amplifier correctly

5. Fan grille filterA foam filter is located behind the front panel grille to prevent dust enteringthe amplifier.6. Power switchThis is used to power

8. Gain select switchAllows amplifier gain to be switched between 32dB (2.26Vrms inputsensitivity) and 41dB gain (0.775mV input sensitivity). (See pag

MARTIN AUDIO switch mode amplifiers use primary switching, i.e. themains is rectified directly before the transformer, which means that thepower suppl

power equal to 1/8 of full power. The one-eighth power is the maximumvolume music can be re-played without continuous amplifier clipping. It also corr

5.6 Input connectionsBoth inputs are balanced on 3 pin XLR type connectors and wired pin 2hot, pin 3 cold, pin 1 ground/shield:PIN 1 - SIG. GROUND/SHI