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Madrigal Audio MARK LEVINSON 29 Operating Manual

Manual is about: dual monaural power amplifier

Summary of MARK LEVINSON 29

  • Page 1

    17 operating manual mark levinson ® nº29 dual monaural power amplifier madrigal audio laboratories, inc..

  • Page 2: Caution

    18 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. Warning: to reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. The l...

  • Page 3

    19 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

    20 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

    21 table of contents unpacking and placement ....................................................................... 1 unpacking ................................................................................................. 1 placement ................................................................

  • Page 6: Unpacking and Placement

    1 unpacking and placement unpack your nº29 amplifier and keep all packing materials for future transport. 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. Care...

  • Page 7: Voltage Selection

    2 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. Nº 29 dual monaural amplifier + – – + serial no. Warning: hazardous v...

  • Page 8: Signal Connections

    3 signal connections 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 eu...

  • Page 9

    4 inverting operation should be used if a phase reversal is required. In 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 desire...

  • Page 10

    5 if your preamplifier is equipped with a balanced main output, it's best 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 li...

  • Page 11: Speaker Connections

    6 speaker connections never connect the nº29's output terminals to any device other than a loudspeaker. Never short-circuit the amplifier output terminals. Never connect the left-channel output terminals to the right-channel output terminals. The nº29 is equipped with gold-plated, high-current, five...

  • Page 12

    7 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" (12.7mm) speaker cable solder tin figure 7b: pigtail connection 5. Solde...

  • Page 13: Power Connection

    8 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.) connect the ac power cord (included in the accessory pack) to the ac connector on the rear pane...

  • Page 14: Bridged Operation

    9 bridged operation when greater power output is desired, the nº29 may be bridged for monophonic operation into load impedances of at least 2 Ω . Note: make sure the loudspeaker is rated to handle high power levels. For example, a bridged nº29 driving an 8 Ω loudspeaker is capable of delivering 200w...

  • Page 15

    10 figure 10: balanced bridging cable 2 1 3 2 1 3 signal ground (shield) left-channel xlr male line-mount (rear view) twisted pair right-channel xlr male line-mount (rear view) 1 2 3 xlr female line-mount (rear view) twisted pair signal ground (shield) 2. Connect the bridging cable's male xlr-type c...

  • Page 16

    11 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-en...

  • Page 17: Care and Maintenance

    12 care and maintenance 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 a...

  • Page 18: Specifications

    13 specifications the correlation between published specifications and sonic quality is unreliable. A list of numbers reveals virtually nothing. All technical measurements must be subject to qualitative as well as quantitative interpretation. Measurements of the nº29 yield excellent results by any s...

  • Page 19: Dimensions

    14 dimensions 17-1/2" (444.5) 1-3/4" (44.5) 1-3/32" (27.5) 3/8" (9.5) 4-1/8" (104.8) 14-3/16" (360.4) 29/32" (23.0) 1-9/16" (39.7) 4-29/64" (113.1) 1" typ. (25.4) 1-7/16" typ. (36.5) 1/8" (3.2) 17-1/4" (438.2) 2-53/64" (71.8) 5-7/8" (174.8) 5-1/4" (133.4) 13/16" (20.7) 7/64" (2.8) 5/8" (15.9) 2-21/6...

  • Page 20

    16 630042-1 printed in u.S.A. ©1993 madrigal audio laboratories, inc. All rights reserved. ® 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..