Madrigal Imaging Dual Monaural Power Amplifier User Manual Page 1

17Operating ManualMark Levinson®Nº29Dual MonauralPower AmplifierMadrigal Audio Laboratories, Inc.

5If your preamplifier is equipped with a balanced main output, it's bestto wire the Nº29 for balanced operation, particularly if long cablelength

6Speaker connectionsNEVER connect the Nº29's output terminals to any device other than aloudspeaker.NEVER short-circuit the amplifier output term

73. Strip 1/2" of insulation from the speaker cable.4. Gently slide the (5/8") bare end of the 14-gauge wire into thecenter of the bare spea

8Power connectionAfter making your loudspeaker connections, apply power to yourpreamplifier and allow it to stabilize. (Mark Levinson preamplifiers, f

9Bridged operationWhen greater power output is desired, the Nº29 may be bridged formonophonic operation into load impedances of at least 2Ω.Note: Make

10Figure 10: Balancedbridging cable213213Signal ground (shield)Left-channelXLR maleline-mount(rear view)Twisted pairRight-channelXLR maleline-mount(re

112. Connect the bridging cable between the left- and right-channelXLR-type input connectors, taking care to insert the correct cableend into its desi

12Care and maintenanceTo remove dust from the cabinet of the Nº29, use a feather duster. Toremove dirt and fingerprints, use isopropyl alcohol applied

13SpecificationsThe correlation between published specifications and sonic quality isunreliable. A list of numbers reveals virtually nothing. All tech

14Dimensions17-1/2"(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

18CAUTIONRISK OF ELECTRIC SHOCKDO NOT OPENCAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK,DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTSINSIDE. REFER

16630042-1 Printed in U.S.A.©1993 Madrigal Audio Laboratories, Inc. All rights reserved.®MADRIGAL AUDIO LABORATORIES2081 South Main Street, P.O. Box 7

19Important safety instructionsPlease read all instructions and precautions carefully and completely before operating your Nº 29Dual Monaural Power Am

20Thank you for choosing the Mark Levinson® Nº29 Dual Monaural Power Amplifier.A great deal of effort went into the design and construction of this pr

21Table of contentsUnpacking and placement ...1Unpacking ...

1Unpacking and placementUnpack your Nº29 amplifier and keep all packing materials for futuretransport.To avoid damaging the connectors on input cables

2Voltage selectionThe Nº29 is factory-set (internally) for 100V, 120V, 200V, 220V, or 240VAC mains operation. Check that the label on the rear panel o

3Signal connectionsThe Nº29 incorporates RCA-type and XLR-type connectors for audiosignal input.The Madrigal-designed RCA-type connectors used for sin

4Inverting operation should be used if a phase reversal is required. Inthis mode of operation, the output signal of the amplifier will be 180°out of p