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Madrigal Audio MARK LEVINSON 29 Operating Manual

Dual monaural power amplifier
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Operating Manual
®
Mark Levinson
Nº29
Dual Monaural
Power Amplifier
Madrigal Audio Laboratories, Inc.
17

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Summary of Contents for Madrigal Audio MARK LEVINSON 29

  • Page 1 Operating Manual ® Mark Levinson Nº29 Dual Monaural Power Amplifier Madrigal Audio Laboratories, Inc.
  • Page 2 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.

  • Page 3: Important Safety Instructions

    Important safety instructions Please read all instructions and precautions carefully and completely before operating your Nº 29 Dual Monaural Power Amplifier. 1. ALWAYS disconnect your entire system from the AC mains before connecting or disconnecting any cables, or when cleaning any component. 2.
  • Page 4 Thank you for choosing the Mark Levinson ® Nº29 Dual Monaural Power Amplifier. A great deal of effort went into the design and construction of this precision device. Used properly, it will give you many years of enjoyment.

  • Page 5: Table Of Contents

    Table of contents Unpacking and placement ............... 1 Unpacking ....................1 Placement ....................1 Ventilation ....................1 Custom installations .................. 1 Voltage selection ..................2 Figure 1: Rear-panel label ..............2 Signal connections ..................3 Connectors ....................3 Cables ......................3 Connection methods and operating modes ........

  • Page 6: Unpacking And Placement

    Unpacking and placement Unpacking Unpack your Nº29 amplifier and keep all packing materials for future transport. PRECAUTION To avoid damaging the connectors on input cables attached to the rear panel, NEVER rest the Nº29 on the rear panel, and NEVER tip it back in a way that would put stress on these connectors.

  • Page 7: Voltage Selection

    Voltage selection The Nº29 is factory-set (internally) for 100V, 120V, 200V, 220V, or 240V AC mains operation. Check that the label on the rear panel of the amplifier indicates the correct AC operating voltage for your location. Figure 1: Rear-panel label Voltage ®...

  • Page 8: Signal Connections

    Signal connections Connectors The Nº29 incorporates RCA-type and XLR-type connectors for audio signal input. The Madrigal-designed RCA-type connectors used for single-ended audio interconnection are a great improvement over ordinary RCA- type connectors. The gold-plated XLR-type connectors employed are of European design, and are made to professional application standards.

  • Page 9: Single-Ended Inverting Operation

    Single-ended inverting Inverting operation should be used if a phase reversal is required. In operation this mode of operation, the output signal of the amplifier will be 180° out of phase with the input signal. This may be required if one component in the system inverts the signal and absolute phase at the loudspeaker is desired.

  • Page 10: Balanced Normal (Non-Inverting) Operation

    Balanced normal If your preamplifier is equipped with a balanced main output, it's best (non-inverting) operation to wire the Nº29 for balanced operation, particularly if long cable lengths are required between the preamplifier and the Nº29. (See Figure 3 for the pin assignments of the Nº29's XLR-type inputs.) Connect the XLR-type male line-mount connector to the preamplifier, carefully observing pin assignments.

  • Page 11: Speaker Connections

    Speaker connections PRECAUTION NEVER connect the Nº29's output terminals to any device other than a loudspeaker. PRECAUTION NEVER short-circuit the amplifier output terminals. PRECAUTION NEVER connect the left-channel output terminals to the right-channel output terminals. Speaker cables The Nº29 is equipped with gold-plated, high-current, five-way binding posts for output termination to a loudspeaker system.

  • Page 12: Connecting The Speakers

    3. Strip 1/2" of insulation from the speaker cable. 4. Gently slide the (5/8") bare end of the 14-gauge wire into the center of the bare speaker cable (be careful not to spread the individual wires of the speaker cable). 1/2"...

  • Page 13: Power Connection

    Power connection After making your loudspeaker connections, apply power to your preamplifier and allow it to stabilize. (Mark Levinson preamplifiers, for example, require about one minute to stabilize.) Connecting the Connect the AC power cord (included in the accessory pack) to the AC connector on the rear panel of the Nº29, then to the AC mains AC power cord outlet.

  • Page 14: Bridged Operation

    Bridged operation When greater power output is desired, the Nº29 may be bridged for monophonic operation into load impedances of at least 2Ω. Note: Make sure the loudspeaker is rated to handle high power levels. For example, a bridged Nº29 driving an 8Ω loudspeaker is capable of delivering 200W RMS.

  • Page 15: Single-Ended Bridged Operation

    Figure 10: Balanced XLR female bridging cable line-mount (rear view) Signal ground (shield) Left-channel XLR male line-mount Right-channel (rear view) XLR male Signal ground (shield) line-mount (rear view) Twisted pair 2. Connect the bridging cable's male XLR-type connectors to the Nº29's left- and right-channel XLR-type input connectors, taking care to insert the correct cable end into its designated channel.

  • Page 16: Figure 12: Single-Ended Bridging Cable

    2. Connect the bridging cable between the left- and right-channel XLR-type input connectors, taking care to insert the correct cable end into its designated channel. You may fabricate such a cable according to Figure 12; it's also available through your Mark Levinson dealer as part of a single-ended bridging kit.

  • Page 17: Care And Maintenance

    Care and maintenance Cleaning To remove dust from the cabinet of the Nº29, use a feather duster. To remove dirt and fingerprints, use isopropyl alcohol applied to a soft cloth. Poor connections cause sonic degradation. We recommend, therefore, that you clean all speaker connection with denatured alcohol at least once a year.

  • Page 18: Specifications

    Two XLR-type connectors Eight five-way binding posts One IEC mains connector For more information, see your Mark Levinson dealer, or contact: Madrigal Audio Laboratories, Inc. 2081 South Main Street (Route 17), P.O. Box 781 Middletown, Connecticut 06457 USA Telephone (203) 346-0896 (FAX (203) 346-1540 If purchased in North America, this Mark Levinson product’s warranty is owner-transferable.

  • Page 19: Dimensions

    Dimensions 1/8" (3.2) Figure 13A: Dimensions, Nº29, top view 1-3/4" (44.5) 1-7/16" TYP. (36.5) 17-1/4" 4-29/64" 17-1/2" (438.2) (113.1) (444.5) 1" TYP. (25.4) 1-9/16" 2-53/64" 1-3/32" (39.7) (71.8) (27.5) 4-1/8" (104.8) 3/8" (9.5) 14-3/16" 29/32" (360.4) (23.0) 21/32" (16.7) Figure 13B: Dimensions, 1-7/16"...
  • Page 20 MADRIGAL AUDIO LABORATORIES 2081 South Main Street, P.O. Box 781 Middletown, Connecticut 06457 USA Telephone: (203) 346-0896 Fax: (203) 346-1540 ® is a registered trademark of Madrigal Audio Laboratories, Inc. ©1993 Madrigal Audio Laboratories, Inc. All rights reserved. 630042-1 Printed in U.S.A.

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