MARK LEVINSON NO431 Mono Power Amplifiers Owner’s Manual

MARK LEVINSON NO431 Mono Power Amplifiers

Product Information

The Mark Levinson Power Amplifier is a high-quality audio device designed to enhance your audio experience. With its advanced technology and sleek design, this amplifier delivers powerful and clear sound for your music or home theater system.

Specifications

• Model: Mark Levinson Power Amplifier
• Power Output: [insert power output specifications]
• Frequency Response: [insert frequency response range]
• Input Sensitivity: [insert input sensitivity range]
• Signal-to-Noise Ratio: [insert signal-to-noise ratio]
• Dimensions: [insert dimensions]
• Weight: [insert weight]

Product Usage Instructions

Safety Precautions
Before operating the Mark Levinson Power Amplifier, please take note of the following safety precautions:

• Always disconnect your entire system from the AC mains before connecting or disconnecting any cables or cleaning any component.
• Use a three-conductor AC mains power cord with an earth-ground connection to prevent shock hazards.
• Avoid exposing the amplifier to extremely high or low temperatures.
• Do not operate the amplifier in an explosive atmosphere.
• Keep electrical equipment out of the reach of children.
• Unplug sensitive electronic equipment during lightning storms.
• If you are in a CE country, obtain permission from the local supply authority before connecting the equipment to comply with CE requirements.

Installation
To install the Mark Levinson Power Amplifier, follow these steps:

1. Choose a suitable location for the amplifier, ensuring proper ventilation and adequate space around it.
2. Connect the provided three-conductor AC mains power cord to the amplifier’s power input and plug it into a grounded power outlet.
3. Connect your audio source (e.g., CD player, preamplifier) to the amplifier’s input jacks using appropriate cables.
4. Connect your speakers to the amplifier’s output terminals using speaker cables.
5. Double-check all connections to ensure they are secure.

Operation
To operate the Mark Levinson Power Amplifier, follow these steps:

1. Turn on your audio source (e.g., CD player) and set it to the desired volume level.
2. Turn on the amplifier by pressing the power button located on the front panel.
3. Adjust the volume level using the amplifier’s volume control knob or remote control.
4. Enjoy your enhanced audio experience with the powerful and clear sound produced by the amplifier.

Frequently Asked Questions (FAQ)

• Q: Can I use the Mark Levinson Power Amplifier with any audio source?
  A: Yes, you can use the amplifier with any audio source that has a compatible output. Simply connect your audio source to the amplifier’s input jacks using appropriate cables.

• Q: How do I clean the Mark Levinson Power Amplifier?
  A: Before cleaning the amplifier, always disconnect it from the AC mains. Use a soft, dry cloth to gently wipe the exterior surfaces. Avoid using any liquid or abrasive cleaners that may damage the amplifier’s finish.

• Q: Can I connect multiple speakers to the Mark Levinson Power Amplifier?
  A: Yes, you can connect multiple speakers to the amplifier’s output terminals. Ensure that the total speaker impedance does not fall below the amplifier’s specified minimum impedance to prevent damage to both the amplifier and the speakers.

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

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 sufficient magnitude to constitute a risk of electric shock to persons.
• The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
• Marking by the “CE” symbol (shown left) indicates compliance of this device with the EMC (Electromagnetic Compatibility) and LVD (Low Voltage Directive) standards of the European Community.

FCC

NOTICE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna;
• Increase the separation between the equipment and the receiver;
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected;
• Consult the dealer or an experienced radio/TV technician for help.

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.
CAUTION: Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.

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 are not recommended for use with this product.
4. NEVER use flammable or combustible chemicals for cleaning audio components.
5. NEVER operate this product with any covers removed.
6. NEVER wet the inside of this product with any liquid.
7. NEVER pour or spill liquids directly onto this unit.
8. NEVER block airflow through ventilation slots or heat sinks.
9. NEVER bypass any fuse.
10. NEVER replace any fuse with a value or type other than those specified.
11. NEVER attempt to repair this product. If a problem occurs, contact your Mark Levinson retailer.
12. NEVER expose this product to extremely high or low temperatures.
13. NEVER operate this product in an explosive atmosphere.
14. ALWAYS keep electrical equipment out of the reach of children.
15. ALWAYS unplug sensitive electronic equipment during lightning storms.
16. In CE countries, this amplifier is considered “professional equipment.” In order to comply with CE requirements, the customer is required to obtain permission from the local supply authority before connecting this equipment.

From all of us at Mark Levinson, thank you for choosing a Mark Levinson Power Amplifier.

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 its packing carton alone.
• DO NOT attempt to lift the Nº432/431 while bending at the waist. When lifting, stand as straight as possible using the leg muscles to lift.

When unpacking the Nº432/431:

• DO save all packing materials for possible future shipping needs.
• DO inspect the Nº432/431 for signs of damage during shipment. If damage is discovered, contact an authorized Mark Levinson dealer for assistance making appropriate claims.

Product Registration
Please register the Nº432/431 within 15 days of purchase. To do so, register online at www.marklevinson.com or complete and return the included product registration card. Product registration serves no warranty purposes. Retain the original, dated sales receipt as proof of warranty coverage.

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 system. Use a purpose-built rack-mounting system to accommodate the weight of the power amplifier. Refer to “Rack Mounting” for additional information.
• DO position the Nº432/431 close to associated loudspeakers to keep loudspeaker wires as short as possible. Use longer interconnecting cables between the preamplifier and the power amplifier. This is preferable because interconnecting cables pass low voltage signals, which transmit over distances with greater accuracy than the high-voltage signals required by loudspeakers.
• DO allow at least a 6-inch (15cm) clearance behind the Nº432/431 for the power cord and signal cables to bend without crimping or straining.
• DO refer to “Dimensions” for assistance with custom installations.
• DO NOT position the Nº432/431 near low-level compo-nents. These power amplifiers are capable of producing mas-sive output currents, which could generate significant magnet-ic fields that induce noise in some sensitive components.
• DO NOT place the Nº432/431 on a windowsill or in another location in which it will be exposed to direct sunlight.

Caution! Before moving the Nº432/431, make sure it is powered off with the front panel power button. Then, make sure the power cord is disconnected from the ~ac mains connector and the electrical outlet. Do not attempt to move the Nº432/431 without adequate assistance. Proper lifting requires at least two people.

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 proper cooling. If the Nº432/431 is placed on the floor, use a thick piece of tempered glass to provide firm support and proper ventilation.
• DO NOT expose the Nº432/431 to high temperatures, humidity, steam, smoke, dampness, or excessive dust. Avoid installing the Nº432/431 near radiators and other heat-producing appliances.

Note In general, better ventilation is required if the top of the Nº432/431 is too hot to touch when the power amplifier is “idle.” Open equipment racks provide the best ventilation for power amplifiers. However, if the power amplifier must be placed in a cabinet that restricts airflow, consider drilling holes in the shelf underneath the power amplifier to improve ventilation or using fans to increase air circulation.

Power Requirements

When shipped, the Nº432/431 is configured for 100V, 120V, 220V, 230V or 240V AC power operation at 50 or 60Hz based on the country for which it is manufactured. Before operating the Nº432/431, make sure the ~ac mains connector label indicates the correct operating voltage for the current location.

Caution!

• Do not attempt to adjust the operating voltage. Consult an authorized Mark Levinson dealer if the operating voltage is incorrect or if the operating voltage must be changed for relocation purposes.
• Be advised that different operating voltages may require the use of different power cords and/or attachment plugs. Contact an authorized Mark Levinson dealer for assistance.

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 for the home entertainment system. Contact a licensed electrician for assistance. If more than one AC circuit is providing power to the system, contact a licensed electrician to ensure that all components are operating with the same solid, low-impedance ground reference.

Important: Building regulations and electrical codes differ from location to location, making it impossible to anticipate the requirements of high- current AC circuits such as the Nº432/431 are capable of using. Contact a local, licensed electrician for information.

Warm-up & Break-in Period

• Although the Nº432/431 delivers superior performance from the first time it is powered on, this performance will continue to improve as the power amplifier reaches its normal operating temperature and various components “break in.” The greatest performance improvements will occur within the first 25 to 50 hours of use. Sound quality will continue to improve for about 300 hours.
• After this initial period, performance will remain consistent unless power is disconnected from the ~ac mains connector. Power is considered disconnected when the Nº432/431 is powered off with the power button; the power cord is disconnected from the ~ac mains connector or the electrical outlet; or an extended power failure or power outage occurs. Power is not disconnected when the Nº432/431 is in standby or sleep mode.
• When power returns, the Nº432/431 will require a brief warm-up and break-in period (not the full 300 hours). It is recommended to allow the Nº432/431 and other audio components to stabilize for about 2 minutes.

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 gain) stage. Because voltage gain stages are kept at their normal operating temperatures, the Nº432/431 remains warmed- up to deliver an optimal performance. In standby, the Nº432/431 consumes about 50W of power.

4. On
   Power is connected to the ~ac mains connector and all power amplifier components.

Continuous Operation
The Nº432/431 should be unplugged during lightning storms and extended periods of non-use. Otherwise, it is designed for continuous operation. For best performance, make sure power is connected to the ~ac mains connector at all times. During normal operation, do not use the power button to power off the Nº432/431. Instead, use the standby button to place the Nº432/431 into standby, which allows the power amplifier to remain warmed-up to deliver optimal performance at all times.

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 Power Supply
The Nº432/431 features two large, robust power supplies. Each supply includes a high-capacity, low-noise toroidal transformer, and four large, low ESR (“Equivalent Series Resistance”) capacitors. Heavy oxygen-free copper bus bars enhance the efficiency of power distribution within the amplifier and eliminate variances introduced by the wiring harnesses that are commonly found in even high-performance amplifiers. High-frequency power supply bypass is accomplished on individual PC boards by components of several film types. The resulting uniformly low power supply impedance seen by the various circuits within the amplifier lays the foundation for massive power and extraordinary finesse that characterizes Mark Levinson amplifiers.

Balanced Design
A truly balanced input topology eliminates the need for an input buffer amplification stage, allowing the first-stage differential amplifier to be driven directly by the source. Matched impedances are presented to the source. Both signals travel through identical circuit paths. Meticulous attention to the layout of the amplifier, including careful mirror-imaging of circuits to cancel magnetic fields, was essential to minimize magnetic field distortions that can occur with such a massive power delivery system. A balanced input signal remains balanced throughout the voltage gain stages. Rejection of common mode noise and distortion is achieved in the final, current gain stage.

Extensive Protection
The Nº432/431 is designed to shut itself down if it senses any of several 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 amplifier

In the case of either a significant DC offset or an over-current condition, the amplifier will shut down to protect itself and the associated loudspeakers. The front panel indicator LED will blink rapidly, remaining lit about half of the time. To restore normal operation, remove the cause of the fault and power cycle the amplifier with the power button. If the ~ac mains connector voltage is too high or too low for safe operation, the amplifier will automatically enter sleep mode and the front panel indicator LED will blink rapidly, remaining on most of the time. The amplifier will not come out of sleep mode until the ~ac mains connector voltage is again within the normal operating range. For example, a 120V amplifier will operate between approximately 108-132VAC; a 230V amplifier will operate between approximately 207-253VAC. Outside of these generous limits, the amplifier will enter sleep mode.

Once the fault condition is removed, the amplifier can be taken out of sleep mode. If the amplifier overheats despite its innovative heat sinking and cooling system, it will enter and remain in sleep mode until the temperature at the output heat sinks drops below 85°C (158˚F or 358K). The front panel indicator LED will blink rapidly, remaining unlit most of the time. Once the fault condition is removed, the amplifier can be taken out of sleep mode. In addition, the AC input to each transformer is fused to protect against excessive current conditions such as driving shorted outputs. Inrush limiting prevents premature aging of power supply components during power-up, and switches off-line once the power supply has been charged. Finally, your amplifier incorporates a controlled clipping circuit that prevents the output devices from saturating. The harsh high-frequency harmonics generated by hard- clipped output devices are avoided by the wave-shaping action of this controlled clip circuitry.

Front Panel

The numbers in the front panel illustration shown above correspond with the numbered items that begin below.

Indicator LED
Indicates the operating state of the Nº432/431 and provides diagnostic information when a fault condition occurs.

Refer to “Extensive Protection” for additional information about fault conditions. If the amplifier will not power on at all (even to sleep mode), check ~ac mains connections or have an authorized Mark Levinson dealer inspect the internal fuses
(which are not user-serviceable).

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 sleep mode. If the power save mode switch is set to off, the Nº432/431 enters standby.

Note: The Nº432/431 must be powered on with the power button to respond to remote trigger commands.

Standby Button

• Places the Nº432/431 into standby or sleep mode and takes the Nº432/431 out of standby or sleep mode. When the Nº432/431 is powered on, pressing and releasing the standby button places the Nº432/431 into standby or takes the Nº432/431 out of standby, allowing it to remain warmed up to deliver optimal performance at all times.
• Pressing and holding the standby button places the Nº432/ 431 into sleep mode. When the Nº432/431 is in sleep mode, pressing and releasing the standby button takes the Nº432/ 431 out of sleep mode. If the power save mode switch is set to on, the Nº432/431 powers on into sleep mode. If the power save mode switch is set to off, the Nº432/431 enters standby.

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, make sure the associated preamplifier master volume is set to a reasonable level.

1. Rear Panel Handles
   Allow for safe, convenient lifting and moving of the Nº432/431. Refer to “Unpacking” for additional information.
   Caution!

   • DO NOT attempt to lift the Nº432/431 from its packing carton alone.
   • DO NOT attempt to lift the Nº432/431 while bending at the waist. When lifting, stand as straight as possible using the leg muscles to lift.

2. Loudspeaker Binding Posts (Outputs)
   Provide left and right-channel audio output. Two custom-made, gold-plated, high-current binding posts labeled + (positive) and – (negative) are available for each channel. Positive binding posts are red; negative binding posts are black.
   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 associated loudspeaker.

   • Connect the – (negative) binding posts on the Nº432/431 to negative inputs on the associated loudspeaker.

   • DO NOT OVERTIGHTEN the Nº432/431 binding posts. The innovative design of these binding posts provides more leverage than more traditional designs. Tight, high-contact pressure connections can be achieved with finger-tightening. Special tools are not needed.

   • DO NOT FORCE the Nº432/431 binding post “wings” up and over a bent or oversized connector. Doing so may result in binding post-damage. If the connector obstructs the “wing”-turning, slide it into place when the binding post opening provides a snug fit. Then, use quarter-turns to tighten the connection as needed.

3. Unbalanced Input

   • Provides left and right-channel audio input. One stereo RCA connector is available to accept unbalanced input signals from an associated preamplifier. These signals are converted to balanced signals upon receipt, and processed as balanced signals thereafter.
   • If the associated preamplifier does not support balanced connections, connect the RCA output on the preamplifier to the RCA input on the Nº432/431. To reduce the chance of noise at the (otherwise un-terminated) inverting XLR input, insert the supplied U-shaped shorting straps between pins 1 and 3. (These shorting straps are installed when the Nº432/431 is shipped.)

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 connects to the appropriate output pin.
   • Pin 1: Signal ground
   • Pin 2: Signal + (non-inverting)
   • Pin 3: Signal – (inverting)
     Connector ground lug: chassis ground
     Note Before making balanced connections, remove the U-shaped shorting straps between pins 1 and 3 on the Nº432/431 XLR inputs and save them for possible future use. These shorting straps are installed when the Nº432/431 is shipped.

5. RS-232 Communications Port
   Provides serial control, performing flash memory software upgrades and facilitating external control in AMX™ and Crestron™ systems. One connector labeled control is available.

6. Communication Ports
   Provide “links” to compatible Mark Levinson preamplifiers and power amplifiers, allowing the Nº432/431 and linked preamplifiers or power amplifiers to share Link controls. Two 6-pin modular RJ-11 jacks labeled input and
   control are available.
   The input communication port can be connected to a compatible Mark Levinson preamplifier that offers Link or communication ports. Both the input and control communication ports can be connected to a compatible Mark Levinson power amplifier that offers communication ports.
   Note Refer to “Linking” BEFORE linking the Nº432/431 to other Mark Levinson components.

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.

   • Connect the trigger in connector on the Nº432/431 to the trigger-out connector on a compatible component. Toggling the connected component between on and standby will toggle the Nº432/431 between on and standby or on and sleep mode (depending on the power save mode switch setting).
   • Connect the trigger out connector on the Nº432/431 to the trigger in connector on a compatible power amplifier. The Nº432/431 will pass DC signals along to the connected power amplifier, creating a “daisy-chain” of trigger control.

8. power save mode switch
   Determines the Nº432/431’s response to reductions in DC trigger voltage, from “high” (5-12V) to “low” (0V).
   Important! DO NOT change the power save mode switch setting when the Nº432/431 is powered on. Make sure power is disconnected from the ~ac mains connector before making adjustments.

   • When the power save mode switch is set to on, the Nº432/431 powers on in sleep mode. If the Nº432/431 is configured for trigger control, incoming DC signals toggle the Nº432/431 between on and sleep mode.
   • When the power save mode switch is set to off, the Nº432/431 powers on in standby. If the Nº432/431 is configured for trigger control, incoming DC signals toggle the Nº432/431 between on and standby.

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 cord. Do not defeat the “third pin” or “earth ground” of the power cord.

The Nº432/431 includes internal fuses as a final stage of protection. The protection circuitry is designed so that only acatastrophic failure will cause these fuses to blow. If this occurs, disconnect the power cord from the Nº432/431 ~ac mains connector and the electrical outlet. Then, contact an authorized Mark Levinson dealer for assistance. Do not attempt to replace the fuse. There are no user-serviceable parts within the Nº432/431.

Danger! Potentially dangerous voltages and current capabilities exist within the Nº432/431, even when power is disconnected from the ~ac mains connector. DO NOT attempt to open the amplifier’s cabinet. There are no user- serviceable parts inside the amplifier. Refer all servicing to an authorized Mark Levinson dealer.

Linking

Linking is available for all Mark Levinson components that offer Link or communication ports, including master, slave in, slave out, , input, and control communication ports. These communication ports can be used to “link” compatible Mark Levinson components in a slave chain, allowing them to share Link controls.

The Nº432/431 offers two communication ports labeled input and control. The input communication port can be connected to a compatible Mark Levinson preamplifier that offers Link or communication ports. Both the input and control communication ports can be connected to a compatible Mark Levinson power amplifier that offers communication ports.

The Nº432/431 can be connected to the following Mark Levinson components:

• Nº30 Series preamplifiers, including the Nº32, Nº38, and Nº38S.
• Nº300 Series preamplifiers, including the Nº320, Nº320S, Nº380, and Nº380S.
• Nº400 Series power amplifiers, including the Nº434 and Nº436.
• Nº39 and Nº390S CD Processors.
• Refer to the appropriate documentation for Link compatibility information about other Mark Levinson components.

Making Link Connections

• DO use Link or communication ports, such as master, slave in, slave out, , input, and control communication ports. DO NOT use RS-232 ports or other rear panel connectors.
• DO use supplied Link communication cables, which are provided in the accessory box.
• DO use constructed Link communication cables. Refer to “Constructing Link Communication Cables” for additional information.

Caution! Link connections must be made using Link or communication ports and supplied or constructed Link communication cables. Connections made with other connectors or cables may damage the Nº432/431 and other linked components, possibly voiding the manufacturer’s warranty and/or standard repair policies.

Constructing Link Communication Cables
Link communication cables can be constructed using an 8-conductor modular telephone cable with the appropriate plug crimped on each end.

• Use an 8-pin RJ-45 plug when connecting to a preamplifier. RJ-45 plugs provide an 8-pin connection.
• Use a 6-pin RJ-11 plug when connecting to a power amplifier. J-11 plugs provide a 6-pin connection in which connector pins 7 and 8 are not used.

Note BEFORE making Link connections, refer to the appropriate documentation for Link or communication port specifications for other Mark Levinson components.

When linking components with constructed Link communication cables, twist the cable 180° as shown in the illustration below for a straight-through (pin 1 -to-pin 1) connection.

Note Contact Mark Levinson Customer Service at 781-280-0300 or www.marklevinson.com for additional assistance making Link connections.

Creating a Slave Chain
Making Link connections creates a slave chain that facilitates communication among linked components, allowing them to share certain controls.

• All slave chains:
  • Must include compatible Mark Levinson components. The Nº432/431 is compatible with the components listed on the previous page. Refer to the appropriate documentation for Link compatibility information about other Mark Levinson components.
  • Must include components that are connected in a certain order to prevent communication from terminating. Power amplifiers such as the Nº432/431 must be the last components in a slave chain.
  • Note The slave chains in this section include preamplifiers and power amplifiers. However, slave chains can also include digital audio processors and digital transports. Refer to the appropriate documentation for information about including these Mark Levinson components in a slave chain.

The table below indicates slave chain requirements for preamplifiers and power amplifiers.

To create a slave chain that includes the Nº432/431:

1. Make sure the Nº432/431 and all associated components are powered off.

2. Connect the input communication port on the first power amplifier to the or slave out communication port on the preamplifier.
   If desired, connect the control communication port on the first power amplifier to the input communication port on another power amplifier. Up to six power amplifiers can be included in a slave chain using “daisy chain” input-to- control communication port connections. The control communication port on the last power amplifier is not connected.
   Refer to the table on the previous page and to the illustration below for additional assistance.

3. When Link connections have been made, power on linked components ONE AT A TIME in the order specified below. Allow each component to complete its initialization sequence before proceeding to the next component.

   • A. Digital Transports
   • B. Digital Audio Processors
   • C. Preamplifier
   • D. Power Amplifiers (begin with the first power amplifier in the slave chain)
     At this point, the front panel standby LEDs on all linked components should be blinking in unison.
     Note Linked components must be powered on ONE AT A TIME in the specific order listed in step 3 (above) to ensure proper functioning of Link controls. DO NOT use a power strip switch to power on several components at once. When power is supplied to a power strip, connected components that do not include a power button will automatically power on.

4. Take the linked preamplifier out of standby.

   • All linked power amplifiers should come out of standby as well. If this does not occur, repeat steps 3 and 4. If problems persist, contact Mark Levinson Customer Service at 781- 280-0300 or www.marklevinson.com.

Link Controls
Linking Mark Levinson components allows them to share certain controls. The table below provides a general description of controls the Nº432/431 shares with other linked components. Some controls may not be available for certain component combinations. Other Mark Levinson components may share additional controls. Refer to the appropriate documentation for additional information.

Note the following:

• Linked components must be powered on ONE AT A TIME in the specific order listed in step 3 (previous page) to ensure proper functioning of Link controls.
• Link controls must be enabled on the linked digital transport linking menu, which allows activation and deactivation of individual Link controls. Refer to the appropriate digital transport owner’s manual for additional information.
• Some Mark Levinson digital transports accommodate a maximum of four front panel display characters. In these cases, certain input names appear abbreviated on the front panel display. For example, an input named No320S will appear as No32 on the digital transport front panel display even though the input is associated with the Nº 320S.
• The linked preamplifier and power amplifier(s) must be in the same standby-state to allow the linked power amplifier(s) to enter standby after a power failure.

Troubleshooting

Incorrect operation is sometimes mistaken for malfunction. If problems occur, refer to this section for troubleshooting information. If problems persist, contact Mark Levinson Customer Support at 781-280-0300 or www.marklevinson.com.

• No audio and the front panel indicator LED is not lit.

  • Examine ~ac mains connections to ensure the power cord is connected to the ~ac mains connector and the electrical outlet.
  • Make sure the Nº432/431 is powered on with the power button.
  • Examine the electrical circuit breaker to ensure that power is supplied to the electrical outlet to which the Nº432/431 is connected.
  • A power loss or power outage may have occurred. In this case, power cycle the Nº432/431 with the power button, waiting at least 10 seconds between powering the Nº432/431 off and on.
  • A fuse may be blown inside the Nº432/431. In this case, disconnect the power cord from the ~ac mains connector and the electrical outlet. Then, contact an authorized Mark Levinson dealer. Do not attempt to replace the fuse. There are no user-serviceable parts within the Nº432/431.
    Danger! Potentially dangerous voltages and current capabilities exist within the Nº432/431, even when power is disconnected from the ~ac mains connector. DO NOT attempt to open the amplifier’s cabinet. There are no user- serviceable parts inside the amplifier. Refer all servicing to an authorized Mark Levinson dealer.

• No audio and the front panel indicator LED is dimly lit.

  • The Nº432/431 is in sleep mode. To take it out of sleep mode, press and release the standby button. The Nº432/431 will power on or enter standby mode based on the power save mode switch setting.
  • A power loss or power outage may have occurred. In this case, power cycle the Nº432/431 with the power button, waiting at least 10 seconds between powering the Nº432/431 off and on.

• No audio and the front panel indicator LED is blinking slowly.

  • The Nº432/431 is in standby. To take it out of standby, press and release the standby button. The Nº432/431 will power on.

• No audio and the front panel indicator LED is blinking rapidly, remaining lit most of the time.

  • Examine ~ac mains connections to ensure the power cord is connected to the ~ac mains connector and the electrical outlet.
  • Power cycle the Nº432/431 with the power button, waiting at least 10 seconds between powering the Nº432/431 off and on.
  • Contact an authorized Mark Levinson dealer. 5. No audio and the front panel indicator LED is blinking rapidly, remaining lit about half of the time.
  • A signal-related fault condition is present, probably either a DC offset or an over-current condition. If this occurs:
  • a. Power the Nº432/ 431 off with the power button.
  • b. Disconnect the input signal and loudspeaker wires.
  • c. Wait 10 seconds.
  • d. Power the Nº432/431 on with the power button.
  • e. Bring the unit out of standby by pressing and releasing the standby button.
    If the Nº432/431 powers on, repeat these steps, reconnecting input signal and loudspeaker wires one at a time to determine what is causing the fault condition. Remember to power the Nº432/431 off with the power button before making or breaking connections. If the Nº432/431 does not power on, there is an internal failure. Contact an authorized Mark Levinson dealer.

• No audio and the front panel indicator LED is blinking rapidly, remaining unlit most of the time.

  • A thermal-related fault condition is present, which causes the Nº432/431 to enter sleep mode. Once the heat sinks have cooled below 85°C (158°F or 358K), the Nº432/431 can be taken out of sleep mode with the standby button.

• No audio and the front panel indicator LED is lit at full brightness.

  • The Nº432/431 is powered on, but is not passing a signal. Examine signal cables to ensure a solid connection between the Nº432/431 and the associated preamplifier and loudspeakers.

• The amplifier keeps powering off.
  A fault condition may be present at the input (e.g., a DC signal from the preamplifier) or the output (e.g., shortcircuited loudspeaker wires). If this occurs:

  • a. Power the Nº432/ 431 off with the power button.
    b. Disconnect the input signal and loudspeaker wires.
    c. Wait 10 seconds.
    d. Power the Nº432/431 on with the power button.
    If the Nº432/431 powers on without entering standby or sleep mode, a fault condition is present at the input or the output. To isolate the problem:

  • a. Power the Nº432/ 431 off with the power button.

  • b. Reconnect the loudspeaker wires.

  • c. Power the Nº432/431 on with the power button.
    If the Nº432/431 powers on into standby or sleep mode, the fault condition is present at the input. If not, the fault condition is present at the output.

• If all else fails…

  • Power cycle the Nº432/431 with the power button, waiting at least 10 seconds between powering the Nº432/431 off and on.
  • Contact an authorized Mark Levinson dealer.
  • Contact Mark Levinson Customer Service at 781-280-0300 or www.marklevinson.com.

Care & Maintenance

The Nº432/431 requires routine care and maintenance to ensure optimal performance. The bulleted items included in this section indicate maintenance procedures that should be performed regularly.

Note Failure to perform the maintenance procedures included in this section may void the manufacturer’s warranty and/or standard repair policies.

• Use a feather duster or a low-pressure blower to remove dust from the Nº432/431 exterior surface.

• Use a soft, lint-free cloth to remove dirt and fingerprints from the Nº432/431 exterior surface. Do not use a cloth made with steel wool or metal polish. If needed, this cloth can be dampened with isopropyl alcohol. Do not dampen the cloth with Benzene, acetone-based cleaners, and other commercial cleaners. Wipe the Nº432/431 exterior surface in the same direction as the grain of the brushed aluminum.
  Caution! Do not apply liquid directly to the Nº432/431 exterior surface. Doing so may damage electrical components.

• Refer to “Installation Considerations” for information about preventative maintenance.

Specifications

The correlation between published specifications and performance is unreliable. Measurements of your amplifier yield excellent results by any standards. However, only those specifications that apply to its actual operation are included here. All specifications are subject to change at any time.

• Nº432 rated power output:

  • 400 w/ch rms power @ 8Ω
  • 800 w/ch rms power @ 4Ω

• Nº431 rated power output:

  • 200 w/ch rms power @ 8Ω
  • 400 w/ch rms power @ 4Ω
    All above power ratings from 20 Hz–20kHz at <0.5% THD (assuming that the AC mains can deliver adequate current, without its voltage sagging)

• Frequency response: within .3 dB from 20 Hz to 20 kHz

• Signal to Noise ratio: better than –65 dB (ref. 2.83V)

• Input impedance:

  •  100kΩ (balanced)
  • 50kΩ (unbalanced)

• Voltage gain: 26.8 dB

• Input sensitivity:

  • 2.83V output: 130 mV for both models
  • Full output: 2.58V for Nº432, 1.82V for Nº431

• Nº432 power consumption: 650W in on, 130W in standby, 10W in sleep

• Nº431 power consumption: 375W in on, 100W in standby, 10W in sleep

• Mains voltage: determined by the needs of the country for which the unit was manufactured; cannot be reset by dealer or user

• Overall dimensions: See “Dimensions”

• Nº432 shipping weight: 125 lbs. (57 kg) each

• Nº431 shipping weight: 105 lbs. (48 kg) each

• Nº432 net weight: 115 lbs. (52 kg) each

• Nº431 net weight: 95 lbs. (43 kg) each

• Connector complement:

  • four custom binding posts
  • two 3-pin XLR balanced input connectors
  • two RCA input connectors
  • two 1⁄8″ mini-jacks for remote turn-on
  • one RS-232 port on RJ-11
  • two Mark Levinson communications ports on RJ-11, RJ-45
  • one IEC-standard AC receptacle

• Output impedance: less than 0.02Ω from 20–20,000 Hz

• Damping factor: greater than 400, 20–20,000 Hz @ 8Ω

Declaration of Conformity

• Application of Council Directive(s): 89/336/EEC and 73/23/EEC, as amended.

• Standard(s) to which Conformity is Declared:

  • EN 55103-1:1996
  • EN 55103-2:1996
  • EN 60065:1998

• Manufacturer:
  Harman Specialty Group
  3 Oak Park
  Bedford, MA 01730-1413 USA
  The equipment identified here conforms to the Directive(s) and Standard(s) specified above.

• Type of Equipment: Power Amplifiers

• Models: Mark Levinson Nº432 and Nº431

• Date: May 2004
  Harman Specialty Group
  Vice President of Engineering
  3 Oak Park
  Bedford, MA 01730-1413 USA
  Telephone: 781-280-0300
  Fax: 781-280-0490
  www.harmanspecialtygroup.com

Dimensions

Nº432

Nº431

Rack-Mounting

If you need or prefer to rack mount your amplifiers, contact your Mark Levinson dealer about the optional rack mount kit. This purpose-designed assembly provides the needed ventilation for the heat sink “chimneys” of the amplifiers, as well as the support required for this heavy component.

To use the rack mount kit, simply bolt the shelf securely to the rack, remove the four feet from the bottom of the amplifier, slide the amplifier into place, and then secure the amplifier to the shelf using the two remaining screws provided with the kit. Slots on the rear of the shelf may be used for dressing cables or using cable ties.
The drawing below will help you visualize the assembly.

The mounted Nº432 amplifier and rack mount kit occupies four standard rack units of height. The Nº431 amplifier and rack kit take up three standard rack units of height.

3 Oak Park, Bedford, MA, 01730-1413 USA | Telephone: 781-280-0300 | Fax: 781-280-0490 | www.marklevinson.com
Customer Support: Telephone: 781-280-0300 | Sales Fax: 781-280-0495 | Service Fax: 781-280-0499
Product Shipments: 16 Progress Road, Billerica, MA 01821-5730 USA
Part No. 070-630670 | Rev 4 | 05/04

“Mark Levinson” and the Mark Levinson logo are registered trademarks of Harman International Industries. U.S. patent numbers and other worldwide patents issued and pending.
“Madrigal Audio Laboratories” and the Madrigal Audio Laboratories logo are registered trademarks of Harman International Industries. U.S. patent numbers and other worldwide patents issued and pending.
©2004 Harman Specialty Group. All rights reserved.
This document should not be construed as a commitment on the part of Harman Specialty Group. The information it contains is subject to change without notice. Harman Specialty Group assumes no responsibility for errors that may appear within this document.

3 Oak Park
Bedford, MA 01730-1413 USA
Telephone: 781-280-0300
Fax: 781-280-0490
www.marklevinson.com

Customer Service
Telephone: 781-280-0300
Sales Fax: 781-280-0495
Service Fax: 781-280-0499
Product Shipments
16 Progress Road
Billerica, MA 01821-5730 USA

References

• Mark Levinson
• Manual-Hub.com – Free PDF manuals!

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