< CONTENTS > PRINT GUIDES CONTENTS (ENGLISH) 1 2 3 3.1 3.2 3.3 4 4.1 4.2 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 6 6.1 6.2 6.3 6.4 7 7.1 7.2 7.3 7.4 7.
> PRINT GUIDES This equipment conforms to the requirements of the EMC Directive 89/336/EEC, amended by 92/31/EEC and 93/68/EEC and the requirements of the Low Voltage Directive 73/23/EEC, amended by 93/68/EEC. Standards Applied EMC Emission Immunity Electrical Safety 1 EN55103-1:1996 EN55103-2:1996 EN60065:1993 UNPACKING Each Martin Audio MA Series amplifier is built to the highest standard and thoroughly inspected before it leaves the factory.
> PRINT GUIDES USER RESPONSIBILITY 3.1 Speaker damage Many loudspeakers can be easily damaged or destroyed by overpowering, especially with the high power available from a bridged amplifier. Always check the speakers continuous and peak power capabilities. Even if the gain is reduced by using the amplifier's front panel attenuator, it is still possible to reach full output power, if the input signal level is high enough. 3.
> PRINT 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. 4.1 The front panel ➄ ➀ ➂➃ ➁ ➁ Figure 1. Front panel ➄ ➅ 1. Carry/protection handle Both handles can be used to carry the amplifier; they also act as protection for the front panel and controls.
< > PRINT ENGLISH CONTENTS GUIDES 5. Fan grille filter A foam filter is located behind the front panel grille to prevent dust entering the amplifier. 6. Power switch This is used to power up the amplifier. (See page 6 and 14) 4.2 The rear panel ➁ ➂ ➀ Figure 2. Rear panel ➃ ➇ ➁ ➄ ➅ 1. Speakon connector This type of speaker connector may be unfamiliar to some users. A full description is found in the operation section. (See page 11). 2. Clip limiter switch Turns the clip limiter on and off.
5 > PRINT GUIDES INSTALLATION 5.1 Mounting The amplifier is two rack units high (2U) and will mount in a standard EIA 19'' rack. Amplifiers may be stacked directly on top of each other. There is no need for spacing between units. If it is the intention to fill a rack with amplifiers, we recommend racking is started from the bottom of the rack. It is also recommended that rear supports are used for amplifiers mounted in the middle of the rack, especially if used as part of a portable system. 5.
< > PRINT BROWN BLUE GREEN/YELLOW GUIDES - LIVE NEUTRAL EARTH Once connected to a suitable AC supply, the amplifier can be started with the power switch. When you power up the amplifier it takes a couple of seconds to self check (this is known as the "soft start" or "slow start" sequence). The fans then blow at high speed before going into "idle". The 2 bottom green LED's then illuminate to show the amplifier is operational. 5.4 Grounding There is no ground lift switch or terminal on this amplifier.
< > PRINT GUIDES MAX OUTPUT POWER MAINS INPUT POWER Power MA1.3 Full Power 1/3 Power 1/8 Power sine wave note 1 note 2 Idle 8 ohms 2X 350 1300 700 400 140 4 ohms 2X 650 2300 1300 800 140 2 ohms 2X 900 3600 1900 1100 140 note 1 Average power with music as program note 2 Normal music power with 9dB headroom, source. The amplifier driven to clip level. IEC standard power rating. Table 1.
< > PRINT GUIDES There are also TRS jacks for linking etc. They are wired as follows: TIP RING SLEEVE - HOT (+) COLD (-) SHIELD/SIG. GROUND SIG.GND – + Figure 4. TRS phone plug The input impedance is sufficiently high (20kohms balanced) to allow "daisy-chaining", or multiple parallel input connections. To daisy-chain, 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.
> PRINT GUIDES Do not use XLR and TRS jacks on the same channel simultaneously for mixing or other purposes. Balanced Output Signal Grounded Shield 1 Amplifier Input 2 2 3 Amplifier Input Balanced Output Chassis Grounded Shield 1 1 3 2 2 3 1 3 Figure 6. Balanced line To use an unbalanced source, connect pin 3 (ring on TRS jack) to the shield of the connector. If you leave one pin disconnected, you will lose 6dB in gain.
> PRINT GUIDES 5.7 Connecting speakers Speaker connections are made via the two Neutrik NL4FC Speakon connectors (1). These connectors meet the EC safety requirements. They are wired as follows: Pin Pin Pin Pin -1 +1 -2 +2 Speaker ground. Speaker positive. No connection. No connection. 21+ 2+ 1- Figure 9. Speakon connector Please note that this is the standard wiring convention for Speakon connectors adopted worldwide.
< > PRINT GUIDES 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 is the same as in stereo mode. You can use either TRS connectors for linking out etc. 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.
> PRINT GUIDES 6.4 Stereo reverse This mode is similar to the Tandem mono mode. Apart from depressing the 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. 2 + 1 3 + – CH A + – – I/P LINK 2 1 3 + PHASE INVERT + + – CH B – + – + Figure 11.
< > PRINT GUIDES 7.2 Powering up - Soft start When you power up the amplifier it takes a couple of seconds to self check. 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. 7.3 Input attenuators The two input level attenuators on the front panel adjust the signal level for their respective amplifier channel in all modes.
8 > PRINT GUIDES PROTECTION FEATURES Each MARTIN AUDIO MA Series amplifier has many advanced protection features that will protect both the amplifier and the speakers connected to it, should a fault condition arise. Under normal use these features are inaudible. All protection circuits are independent. Output limiter An output limiter is included to avoid amplifier clipping. When an amplifier is severely overdriven, its output waveform is clipped (its peaks are squared off) reducing the crest factor.
> PRINT GUIDES This circuit is inaudible in normal use, however it can be turned off. If the VHF protection is required to be turned off i.e. for studio monitors, please consult your supplier, as this is a non-user adjustment. 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.
< > PRINT GUIDES Switch mode power supply (SMPS) Switch mode power supplies are the modern solution to the problems of size and weight. However, early examples of SMPS used in power amplification were not ground breaking and literally adopted the type of supply found in many computers today. The MARTIN AUDIO SMPS is different in that it is regulated. Whilst the SMPS may sound complex it is actually very straightforward with high reliability. The net result is good bass and fast response.
< 10 > PRINT 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.
< 11 > PRINT 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. Please contact MARTIN AUDIO for information. 19 Martin Audio – MA1.
< 12 > PRINT GUIDES MAINTENANCE Under normal use the amplifier should give years of trouble free service. The only user maintenance required from the user is to vacuum the front grille periodically. In some extreme cases it may be necessary for your supplier to clean the inside of the amplifier. These conditions usually occur after prolonged use in environments using "cracked-oil" smoke machines. If you are using your amplifier for heavy-duty use i.e.
< 13 > PRINT GUIDES WARRANTY General The MA1.3 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.
< > 14 PRINT GUIDES TECHNICAL SPECIFICATIONS MA1.3 INPUT IMPEDANCE 20kohms (balanced) 10kohms single ended GAIN SELECT SWITCH 37dB (I/P sens 0.775V), 32dB (I/P sens 1.27V) CMRR@1kHz >50dB OUTPUT IMPEDANCE@1kHz 0.07 ohms POWER BANDWIDTH 10Hz - 50kHz SLEW RATE 40V/us HUM/NOISE <-105dB CHANNEL SEPARATION 1kHz - 90dB 10kHz - 75dB MAINS OPERATING VOLTAGE 120 - 270 (minimum start voltage 190) full output power maintained 180 - 280V. Optional (65 - 135V) operation.
CONTENTS < > PRINT MA1.3 GUIDES 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. Telephone: +44 (0)1494 535312 Facsimile: +44 (0)1494 438669 Web: www.martin-audio.com E-mail: info@martin-audio.
CONTENTS < > PRINT GUIDES MA1.
