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WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of suffic
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Important Safety Instructions Please read all instructions and precautions carefully and completely before operating your Mark Levinson power amplifier. 1. ALWAYS disconnect your entire system from the AC mains before connecting or disconnecting any cables, or when cleaning any component. 2. This product must be terminated with a three-conductor AC mains power cord that includes an earth ground connection. To prevent shock hazard, all three connections must ALWAYS be used. 3. AC extension cords
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From all of us at Mark Levinson, thank you for choosing a Mark Levinson Power Amplifier. 4 “Mark Levinson” and the Mark Levinson logo are registered trademarks of 3 Oak Park Harman International Industries. U.S. patent numbers and other worldwide Bedford, MA 01730-1413 USA patents issued and pending. Telephone: 781-280-0300 Fax: 781-280-0490 www.marklevinson.com “Madrigal Audio Laboratories” and the Madrigal Audio Laboratories logo are registered trademarks of Harman International Industries.
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Table of Contents Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .7 Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Power Requirements . . . . . . . . .
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Unpacking Warning! DO NOT attempt to lift or move the Nº432/431 without adequate assistance. Failure to follow the procedures included in this section may result in personal injuries and/or product damage. The Nº432/431 are massive power amplifiers. The Nº432 ships at 125 pounds (57kg) and the Nº431 ships at 105 pounds (48kg). Rear panel handles are provided for safe, convenient lifting and moving. Proper lifting requires at least two people. Caution! DO NOT attempt to lift the Nº432/431 from it
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Installation Considerations The Nº432/431 requires special care during installation to ensure optimal performance. Pay particular attention to the precautions included in this section and to other precautions included throughout this owner’s manual. Placement • DO review “Important Safety Instructions” and “Power Requirements” before installing the Nº432/431. • DO place the Nº432/431 on a solid, flat, level surface such as a table, shelf, or floor OR bolt the Nº432/431 into a rack- mounting syst
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Ventilation • DO select a dry, well-ventilated location out of direct sunlight. • DO allow at least a 2 to 3-inch (5 to 8cm) clearance above the Nº432/431 for proper heat dissipation through air circulation. The Nº432/431 is designed for passive, convection cooling. • DO NOT obstruct the ventilation holes on the top and bottom of the Nº432/431 or reduce airflow through the Nº432/431. • DO NOT place the Nº432/431 on a thick rug or carpet or cover the Nº432/431 with a cloth, as this might prevent
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The Nº432/431 is capable of passing remarkable musical signals regardless of signal and loudspeaker demands. On either an instantaneous or continuous basis, these power amplifiers can drive exceptional power levels into most all loudspeaker loads. Depending on listening habits, loudspeaker demands, and the number of power amplifiers present in the system – it is possible for the electrical service to become the limiting performance factor. In this case, consider installing a dedicated AC circuit
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Operating States The Nº432/431 has four operating states: 1. Off Power is disconnected from the ~ac mains connector. 2. Sleep Mode Power is connected to a small power supply, communication circuits, and control circuits. When taken out of sleep mode, the Nº432/431 requires a brief warm-up and break-in period. In sleep mode, the Nº432/431 consumes less than 15W of power. 3. Standby Power is connected to the main power supply and voltage gain stages. Power is not connected to the output (current
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Special Design Features Thank you for purchasing the Nº432/431 Power Amplifier. While these amplifiers are straightforward in everyday use, they include several design features that are responsible for their outstanding performance. In particular, these amplifiers defy the accepted wisdom that it is impossible to design a large, powerful amplifier that also has all the finesse of the finest smaller amplifiers. A few of the technical highlights that make this possible are described below. Massive
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Extensive Protection The Nº432/431 is designed to shut itself down if it senses any of a number of fault conditions that could cause damage to itself or to associated loudspeakers. These fault conditions include: •the presence of DC (direct current) at the output • demand for excessive current at the output, indicating a short- circuit • over-voltage or under-voltage conditions (+5% to -10%) at the ~ac mains connector • unsafe operating temperatures in any of several critical areas within the a
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DUAL MONO AMPLIFIER Nº432 standby power 1 2 3 Front Panel The numbers in the front panel illustration shown above correspond with the numbered items that begin below. 1. Indicator LED Indicates the operating state of the Nº432/431 and provides diagnostic information when a fault condition occurs. LED Behavior Description 13 Fully lit Indicates that the power amplifier is powered “on.” Slowly blinking Indicates that the power amplifier is in standby. Dimly lit Indicates that the power amplifier i
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2. Power Button Powers the Nº432/431 on and off when the power cord is connected to the ~ac mains connector and an electrical outlet. When the Nº432/431 is powered on, pressing and releasing the power button disconnects power from the ~ac mains connector and powers the Nº432/431 off. When the Nº432/431 is powered off, pressing and releasing the power button connects power to the ~ac mains connector and powers the Nº432/431 on. If the power save mode switch is set to on, the Nº432/431 enters slee
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1 2 3 5 7 8 3 2 1 RIGHT CHANNEL LEFT CHANNEL outputs outputs inputs inputs 1 1 control power save mode control input control trigger trigger out in on off ~ ac mains 2 2 4 6 9 4 Rear Panel The numbers in the rear panel illustration shown above correspond with the numbered items that begin below. Caution! Never make or break connections to the Nº432/431 unless it and all associated components are powered off and disconnected from electrical outlets. Before making connections to the Nº432/ 431, ma
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Caution! NEVER connect power amplifier outputs to any component other than a loudspeaker. NEVER short-circuit power amplifier outputs. NEVER connect power amplifier outputs to another power amplifier’s outputs. For best performance, use high-quality loudspeaker cables. To connect these cables, use a high-quality spade or hook lug soldered to the cable or crimped to the cable with extremely high pressure. • Connect the + (positive) binding posts on the Nº432/431 to positive inputs on the associat
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4. Balanced Input Provides left and right-channel audio input. One stereo XLR connector is available to accept balanced input signals from an associated preamplifier. For best performance, use balanced connections whenever possible. Refer to the illustration below and to the associated preamplifier documentation to ensure that Nº432/431 XLR input pin assignments correspond to the associated preamplifier XLR output pin assignments. If not, wire the cable so that the appropriate input pin connect
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7. trigger in and out connectors Provide DC trigger control. One 1/8-inch mini-jack labeled trigger in is available to receive 12 or 5V DC signals from a connected component, and one 1/8-inch mini-jack labeled trigger out is available to pass these signals along to a connected power amplifier. The illustration below shows tip polarity requirements. 5 to 12V, positive tip polarity Connect the trigger in connector on the Nº432/431 to the trigger out connector on a compatible component. Toggling th
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9. ~ac mains connector Provides power to the Nº432/431 through the supplied power cord when the supplied power cord is connected to the ~ac mains connector and the electrical outlet. One IEC-standard AC mains receptacle labeled ~ac mains is available. Note Before operating the Nº432/431, make sure the ~ac mains connector label indicates the correct operating voltage for the current location. Warning! The Nº432/431 has been safety-tested and designed for operation with a three-conductor power cor
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