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Operating Manual
®
Mark Levinson
Nº 333
Nº 332
Nº 331
Dual Monaural
Power Amplifiers
Madrigal Audio Laboratories, Inc.
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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 en- closure that may be of suff
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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 which includes an earth ground connection. To prevent shock hazard, all three connections must ALWAYS be used. 3. AC extension cor
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Table of Contents Unpacking Your Amplifier ........................................................................... 6 Warm up/break-in period ................................................................................. 6 Placement Considerations ......................................................................... 7 Ventilation ........................................................................................................... 7 Operating Voltage, Nº333 .......................
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Unpacking Your Amplifier Warning! Under no circumstances should you consider unpacking your amplifier without adequate assistance, as both personal injury and damage to the product is likely unless you follow the procedures listed below. The shipping weight of your Dual Monaural Power Amplifier is over 100 lbs. (45 kg)—the Nº333, for example, weighs in at 150 pounds (68 kg)! Any freight this massive must be handled with extreme care to avoid injury. At least two strong people are required to unp
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Placement Considerations For your protection, review “Important Safety Instructions” and PRECAUTION “Operating Voltage” before you install your amplifier. Your Mark Levinson 300-series power amplifier is specifically designed to stand on the floor, and must be used as a freestanding unit. In most installations, locat- ing it near the loudspeakers is best. Obviously, this approach minimizes the length of the speaker wires and necessitates longer interconnecting cables from the preamplifier to the
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Operating Voltage, Nº333 Your Mark Levinson Dual Monaural Power Amplifier is characterized by its re- markable ability to pass a musical signal with utter integrity, regardless of how demanding that signal and the loudspeakers used might be. When called upon to do so, your amplifier is capable of generating truly prodigious power levels into virtually any speaker load, on either an instantaneous or a continuous basis. Depending on the demands placed on the amplifier by your loudspeaker and your
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Operating Voltage, Nº332 & Nº331 Your Mark Levinson Dual Monaural Power Amplifier is characterized by its re- markable ability to pass a musical signal with utter integrity, regardless of how demanding that signal and the loudspeakers used might be. When called upon to do so, your amplifier is capable of generating truly prodigious power levels into virtually any speaker load, on either an instantaneous or a continuous basis. Depending on the demands placed on your amplifier by your loudspeaker
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Nº 331 AC mains maximum current requirements 100V 120V 200V 210V 220V 230V 240V Off .1 .09 .05 .047 .045 .043 .042 Standby 1.08 0.90 0.54 0.52 0.49 0.47 0.45 On, at idle 2.60 2.20 1.32 1.26 1.20 1.15 1.10 100w @ 8Ω * 7.32 6.10 3.66 3.48 3.33 3.20 3.05 200w @ 4Ω * 12.4 10.4 6.20 5.90 5.63 5.40 5.17 400w @ 2Ω * 21.5 18.0 10.8 10.3 9.80 9.40 8.98 * power ratings are continuous (rms) with less than 0.5% THD, from 20-20,000 Hz. It is important to understand that these are worst-case requirements un
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Special Design Features Congratulations on your purchase of a Mark Levinson Nº 300-series Dual Monau- ral Power Amplifier. While your new amplifier is straightforward in its everyday use, it includes several design features which are responsible for its outstanding performance. In particular, your new Dual Monaural power amplifier defies the accepted wisdom that it is impossible to design a large, powerful amplifier that also has all of the finesse of the finest smaller amplifiers. A few of the
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test of the Nº333 at maximum power requires about 45 amperes at 120V. (The laws of physics refuse to be cheated. Long-term, you cannot deliver more power into the speaker than you can pull from the wall.) Thirty-two TO-3 output transistors are distributed in the heatsinks of the Nº 333 to conduct and control the flow of its remarkable power capabilities to the loud- speaker. There are eight matched, complementary pairs of output transistors in each channel of the amplifier. Similarly, the Nº332
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In addition, the AC input to each transformer is fused to protect against excessive current conditions such as driving shorted outputs. Inrush limiting prevents pre- mature 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 wa
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R MADRIGAL AUDIO LABORATORIES 2 Nº 333 DUAL MONAURAL POWER AMPLIFIER 1 Front Panel 1STANDBY BUTTON When power is first applied to the power amplifier (if yours is a CE-certi- fied unit, this means plugging it in and turning on the rear panel AC mains switch), the amplifier remains off. Pressing the front panel standby button will bring the amplifier from off to standby. After a delay of ten seconds (to allow the power supplies to charge and all circuitry to stabilize), subse- quent pressing of t
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2 1 DUAL MONAURAL POWER AMPLIFIER Nº 333 inputs inputs 6 communication ports remote turn-on jacks ~ac mains 4 5 3 Rear Panel Caution! Turn the volume on your preamplifier all the way down before attempting to connect anything to your Mark Levinson power amplifier. 1 BALANCED AUDIO INPUT Accepts a signal from a preamplifier with balanced outputs via a high qual- ity XLR connector. If connection to the preamplifier is made with a bal- anced interconnecting cable, it is important to remove the shor
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2 SINGLE-ENDED INPUTS These RCA connectors accept single-ended inputs from preamplifiers with single-ended (RCA) outputs. Single-ended input signals are converted to balanced signals immediately upon being received at the amplifier, and are handled as balanced signals thereafter. If your preamplifier does not support balanced connection to the power amplifier, connect the single-ended output of your preamplifier to the RCA input on the amplifier. To reduce the chance of noise pickup at the (othe
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In addition, should a fault condition cause any amplifier’s protection cir- cuitry to activate, it can report the nature of the problem to a linked Mark Levinson preamplifier via this communications link. If this occurs, the preamplifier will display the number of the amplifier at fault (AMP1 being the first amplifier in the daisy chain, AMP2 being the second amplifier, and so on). The preamplifier will also indicate the nature of the fault condition with one of the following codes: Code Fault C
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5 SPEAKER BINDING POSTS The Mark Levinson 300-series amplifiers are equipped with custom made, gold-plated, high-current binding posts for output termination to a loud- speaker system. To take full advantage of the amplifier’s sonic quality, we recommend using high-quality speaker cable; please see your Mark Levinson dealer. Caution! NEVER connect a power amplifier’s output terminals to any device other than a loudspeaker. NEVER short-circuit the amplifier’s output terminals. NEVER connect the o
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6 AC MAINS CORD AND AC MAINS SWITCH Conventional IEC standard power cords cannot be used in the Nº 333, due to the potential current requirements of Nº 333 when operating into low impedance loads. (The highest available current rating for an IEC standard three-conductor connector such as is used on most stereo equipment, in- cluding other Mark Levinson products, is 16 amperes.) Instead, the Nº 333 incorporates a high current AC cord which is attached directly to the ampli- fier itself. Conventio
