CONTENTS < > PRINT GUIDES All material © 2007. Martin Audio Ltd. Subject to change without notice. 1 Martin Audio – MA2.8s Amplifier Page No 1 2 2 2 2 2 2 3 3 3 3 4 4 4 5 6 6 6 6 6 6 7 7 7 7 7 7 8 9 9 9 9 9 9 10 10 10 10 10 11 12 12 12 12 13 14 14 14 14 14 14 15 15 15 15 15 15 16 16 17 18 ENGLISH CONTENTS (ENGLISH) 1 CONTENTS MA2.8S USER GUIDE 2 APPROVALS 3 WARNINGS 3.1 EXPLANATION OF GRAPHICAL SYMBOLS 3.2 WARNING 3.3 CAUTION 3.4 IMPORTANT SAFETY INSTRUCTIONS 3.5 USER RESPONSIBILITY 3.5.
CONTENTS < PRINT GUIDES APPR OV A LS 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. Standard Applied 3 3.1 EMC Emission EMC Immunity Electrical Safety EN55103-1, E3 EN55103-2, E3, with S/N below 1% at normal operation level.
CONTENTS < > GUIDES 12. The amplifier is intended to use in a 19” rack. Follow the mounting instructions. When racks with wheels are used, use caution to avoid injury from tipping when in motion. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Do not connect an amplifier output in parallel or series with any other amplifier’s output.
CONTENTS < 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 Unpacking Each Martin Audio MA series amplifier is built to the highest standard and thoroughly inspected before it leaves the factory.
CONTENTS < > PRINT GUIDES ENGLISH 6. On indicator The two bottom green LED’s indicate that the output circuits are receiving the correct rail voltage. 7. Fan grille filters Two grilles with foam filters are located on the front panel to prevent dust from entering the amplifier. The grilles are removable for easy cleaning of the filters by simply pulling them off. The foam filters should always be used. 8. Power switch Turns mains power on or off. (See page 10 and 14) 4.3 Rear Panel CH.
CONTENTS < 5.1 PRINT GUIDES ENGLISH 5 > REAR PANEL FEATURES Gain switch The gain switch located on the rear panel (the central DIP-switch) changes the gain/input sensitivity of the amplifier. This can be useful when using low or high nominal input signals. Most professional mixing consoles operate at a nominal level of +4 to +6 dBu; the 32dB gain position ensures there is plenty of fader movement available.
CONTENTS < PRINT GUIDES Operating modes 5.3.1 Stereo mode In this configuration, both channels operate independently of each other. This is used for all 2-channel operations, e.g. bi-amp and stereo. Stereo mode is selected by placing the two central switches in the off position (Down). The attenuators on the front panel control the respective channels levels. Never connect either output terminal to ground or in parallel.
CONTENTS < > PRINT GUIDES 5.4 Impedance matching (MLS switch) The MLS switches are located on the rear panel of the amplifier. The MLS (Minimum Load Select) switches offer impedance/power matching, so that you can drive the MA 2.8s into 2 ohms without increased heat loss. The MA 2.8s can deliver 1500 watts into both 2 and 4 ohms. Use higher MLS switch positions when connecting to lower impedances as shown in Table 1. As can be seen from Table 1, the MA 2.
CONTENTS < PRINT GUIDES The MLS¸ technology : Type of mode MLS switches on rear panel Conventional mode 5.4.2 The problem: If you assume that a power amplifier can deliver 1000 watts into 8 ohms, and is designed to be able to run into 2 ohms. Theoretically, it should be able to deliver 4000 watts into the 2-ohm load. Very few professional power amplifiers are able to do this, as all conventional power amplifier designs are a compromise between power dissipation, costs, size etc.
CONTENTS < > PRINT GUIDES For installations with a central cooling system, usually found in fixed installations with a dedicated rack room, it may be necessary to calculate the maximum heat emission. Refer to Power consumption on page 10. Remember never rack different brands of amplifiers together that have opposing air flow characteristics. 6.3 Operating voltage WARNING! A label just below the mains cable inlet on the rear of the amplifier indicates the selected AC mains operating voltage.
CONTENTS < > PRINT GUIDES Second, the maximum expected average current under worst-case program material, which is 1/3 of full power according to the FTC-standard. At this level the music will be in a state of constant clip and is therefore the highest power level that can be obtained without completely obliterating the program material. Last, the "normal operating power", as defined by EN 60065, IEC 65/ANSI/UL 6500 as a measurement level for approval and testing to these standards.
CONTENTS < PRINT GUIDES ENGLISH 7 > CONNECTIONS 7.1 Input connections 7.1.1 Balanced inputs XLR Input connectors are active balanced and wired according to the IEC 268, that is pin 2 hot, and wired in the following way: PIN 1 PIN 2 PIN 3 GROUND/SHIELD HOT (+) COLD (-) XLR balanced XLR input connector Within the Neutrik® Combojack there is a _”(6.3mm) phone jack, which is wired in parallel with the XLR. TIP HOT RING COLD SLEEVE SHIELD/GROUND CH. B INPUT TRS plug CH.A LINK CH. A INPUT CH.
CONTENTS < > PRINT GUIDES Balanced line with unbalanced equipment For two-channel (stereo) operation, use both channels A and B. For tandem stereo or bridged mono operation, use only one of the inputs. See operating modes for more details. 7.2 Connecting speakers Speaker connections are made via the two Neutrik NL4FC Speakon connectors. The Speakon connector is designed for high power loudspeaker use and meets all worldwide safety requirements.
CONTENTS < GUIDES OPERATION 8.1 8.2 PRINT ENGLISH 8 > Operating precautions • Make sure that the power switch is set to “OFF” before connecting any input or output or operating the switches on rear panel. See pages 9 about installation. • Make sure that the AC mains voltage is correct and the same as the one printed on the rear panel of the amplifier. See pages 10, about operating voltage and power consumption.
CONTENTS < PRINT GUIDES 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. In extreme cases, the waveform can approach that of a square wave. An amplifier is normally capable of producing far more power under these condition s than its normal undistorted rated output power.
CONTENTS < PRINT GUIDES MAINTENANCE Under normal use the amplifier should provide years of trouble-free service. The only maintenance required by the user is to clean the front grill periodically. In some extreme cases it may be necessary for authorized service personnel to clean the inside of the amplifier. These conditions usually occur after prolonged use, e.g. in environments using "cracked- oil" smoke machines. If you are using your amplifier for heavy duty use i.e.
CONTENTS < > PRINT GUIDES ENGLISH 11 WARRANTY General The MA 2.8s Power amplifier is warranted to be free from defects in components and factory workmanship under normal use and service, for a period of three years from the date of original purchase.
CONTENTS < PRINT GUIDES ENGLISH 12 > SPECIFICATIONS MA2.8S MAXIMUM OUTPUT POWER MLS in 0dB position 8Ω per Channel 4Ω per Channel 2Ω per Channel 8Ω Bridged 4Ω Bridged EIA @1kHz 1%thd FTC 20 – 20kHz @ 0.
CONTENTS < > PRINT GUIDES 10Kg (22Ibs) SHIPPING DIMENSIONS (W) 560mm x (H) 180mm x (D) 500mm (W) 22ins x (H) 7.1ins x (D) 19.7ins SHIPPING WEIGHT 11.6Kg (25.
CONTENTS < > PRINT GUIDES MA2.8s Amplifier Please Click here to return to main menu Please Click here to visit our website 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.com All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS < > PRINT GUIDES MA2.8s Amplifier User’s Guide ENGLISH The Martin Experience All material © 2007. Martin Audio Ltd. Subject to change without notice.
