Owner’s Manual Nº33H Monaural Power Amplifier
Important Safety Instructions 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block ventilation openings. Install in accordance with the manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, heat registers, stoves, or another apparatus that produces heat. 9. Do not defeat the safety purpose of the polarized or grounding-type plug.
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.
Documentation Conventions This document contains general safety, installation, and operation instructions for the Nº33H Power Amplifier. It is important to read this document before attempting to use these components. Pay particular attention to safety instructions. Appears on the component to indicate the presence of uninsulated, dangerous voltages inside the enclosure – voltages that may be sufficient to constitute a risk of shock.
Table of Contents Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Opening the Shipping Crate . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Moving the Nº33H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .4 Placement . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking Warning! DO NOT attempt to lift or move the Nº33H without adequate assistance. Failure to follow the procedures included in this owner’s manual may result in personal injury and/or product damage. The shipping weight of each Nº33H Monaural Power Amplifier is approximately 220 pounds (100 kg). To avoid injury, handle the Nº33H with extreme care. At least two strong people are required to unpack the Nº33H amplifier from its shipping crate.
4. Use a socket wrench to remove: Moving the Nº33H • The four 9/16-inch hexagonal-head bolts that secure the Nº33H to the base of the crate. These bolts attach directly to the bottom of the Nº33H’s feet and are accessible underneath the pallet on which the Nº33H sits. • The two 9/16-inch hexagonal-head bolts that hold the retaining bar in place. Please read and understand these instructions before attempting to move the Nº33H from the shipping crate base.
Installation Considerations The Nº33H requires special care during installation to ensure optimal performance. Pay particular attention to the information included in this section. Placement Your Mark Levinson Nº33H Monaural Power Amplifiers are specifically designed to stand on the floor, and must be used as freestanding units. In most installations, locating them near the loudspeakers is best.
• DO NOT place the Nº33H on a thick rug or carpet or cover the Nº33H with a cloth, as this might prevent proper cooling. • DO NOT expose the Nº33H to high temperatures, humidity, steam, smoke, dampness, or excessive dust. Avoid installing the Nº33H near radiators and other heat-producing appliances. Note Each Nº33H dissipates about 360 watts of heat energy when idle; it is normal and safe for it to run warm.
Note 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 Nº33H. Contact a local, licensed electrician for information. Warm-up & Break-in Period Although the Nº33H delivers superior performance from the first time it is powered on, this performance will continue to improve as various components “break in.
Special Design Features While the Nº33H Monaural Power Amplifier is straightforward in everyday use, it includes several design features that are responsible for its outstanding performance. In particular, it defies the accepted wisdom that it is impossible to design a large, powerful amplifier that also has all the finesse of the finest smaller amplifiers. Massive Power Supply The Nº33H features a 3.
Fully 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 and both signals travel through identical circuit paths.
cycle the amplifier with the ~ac mains relay switch on the rear panel. In addition, the AC input to each transformer is fused to protect against excessive current conditions such as driving shorted outputs. In-rush limiting prevents premature aging of power supply components during power-up, and switches to off-line once the power supply has been charged. Finally, the Nº33H incorporates a controlled clipping circuit that prevents output devices from saturating.
Front Panel REFERENCE MONAURAL AMPLIFIER Nº 33H 2 1 1. standby button 10 When power is first applied to the Nº33H power amplifier, and assuming the rear panel AC mains switch is set to its on position, the amplifier remains completely off. Press the front panel standby button to bring the amplifier from completely off to standby. Each time you subsequently press the standby button (after a delay of ten seconds to allow all circuitry to stabilize), the Nº33H is toggled between standby mode and fully on.
Rear Panel 3 4 balanced single ended inputs CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
2. ~ac mains relay switch The AC mains switch turns the amplifier completely off by disconnecting the supervisory power supply from the AC mains. Since this small supervisory supply controls the main power supply access to AC power, shutting down the supervisory power supply also disconnects the main supply from AC. 3. balanced input Receives balanced audio input from the associated preamplifier. One XLR connector is available. For best performance, use balanced connections whenever possible.
5. loudspeaker binding posts (outputs) Provide audio output. Two pair of custom-made, gold-plated, high-current binding posts labeled + (positive) and – (negative) are included. Positive binding posts are red; negative binding posts are black. These binding posts are designed to facilitate high pressure, high contact area connections without the use of tools such as nut drivers. A simple finger-tightening actually yields higher contact pressure than traditional hex binding posts.
6. slave in & slave out communication ports Provide “links” to compatible Mark Levinson preamplifiers and power amplifiers, allowing the Nº33H and linked preamplifiers or power amplifiers to share Link controls. Two 6-pin modular RJ-11 jacks labeled slave in and slave out are available. The slave in communication port can be connected to a compatible Mark Levinson preamplifier that offers Link or communication ports.
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 Nº33H offers two Link communication ports labeled slave in and slave out.
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. RJ-11 plugs provide a 6-pin connection in which connector pins 7 and 8 are not used.
• Must include components that are connected in a certain order to prevent communication from terminating. Power amplifiers such as the Nº33H 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.
Nº320S Preamplifier Step A: Connect the (slave out) communication port on the preamplifier to the slave in communication port on the first Nº33H slave in slave out Nº33H Monaural Amplifier Step B: Connect the slave out communication port on the first Nº33H to the slave in communication port on the second Nº33H. slave out slave in Nº33H Monaural Amplifier Step C: Connect the slave out communication port on the second Nº33H to the slave in communication port on a third power amplifier.
Link Controls Component Control Standby Link Fault Condition Link Linking Mark Levinson components allows them to share certain controls. The table below provides a general description of controls the Nº33H 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.
Troubleshooting Incorrect operation is sometimes mistaken for malfunction. If problems occur, refer to this troubleshooting section. If problems persist, contact your Mark Levinson dealer. 1. No audio and the front panel indicator LED is not lit. • Examine ~ac mains connections to ensure the power cord is connected to the electrical outlet. • Make sure the Nº33H is powered on with the rear panel power switch.
4. No audio and the front panel indicator LED is lit at full brightness. • Danger! The Nº33H is powered on, but is not passing a signal. Power the Nº33H off with the ~ac mains relay switch, then examine the signal cables to ensure a solid connection between the Nº33H and the associated preamplifier and loudspeakers. Power the Nº33H off with the ~ac mains relay switch before touching the loudspeaker wires. 5. The Nº33H keeps powering off.
Care & Maintenance To remove dust from the cabinet of your Nº33H, use a feather duster or a lint-free soft cloth. To remove dirt and fingerprints: 1. Dampen a soft, lint-free cloth with isopropyl alcohol, then lightly clean the surface of the unit with the cloth, moving with the “grain” of the anodized, brushed aluminum. Do not use excessive amounts of alcohol that could drip off the cloth and into the unit. 2.
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. Rated power output: • 34.6 Vrms (150 W) @ 8Ω • 34.6 Vrms (300 W) @ 4Ω All of the above power ratings were measured as continuous (rms) power from 20Hz–20kHz with no more than 0.3% THD.
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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 55013 : 2001 • EN 55020 : 2002 • EN 60065 : 1998 • EN 61000-3-2 : 2000 • EN 61000-3-3 : 1995 + A1 : 2001 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.
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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.
