Madrigal Imaging Dual Monaural Power Amplifier manuale d’uso

17 Operating Manual Mark Levinson ® N º 29 Dual Monaural Power Amplifier Madrigal Audio Laboratories, Inc.[...]

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 lightning flash with arrowhead symbol, within an eq[...]

19 Important safety instructions Please read all instructions and precautions carefully and completely before operating your N º 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. This product is equipped with a three-conducto[...]

20 Thank you for choosing the Mark Levinson ® N º 29 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.[...]

21 T able of c on t en ts Unpacking and placement ....................................................................... 1 Unpacking ................................................................................................. 1 Placement ................................................................................................. 1 Ventil[...]

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. Carefully inspect your Nº29 for damage and flaws. I[...]

2 V olt ag e se lec tion 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 VOL T AGES A VAILABLE INSIDE: DISCONNECT [...]

3 Signal connections The N º 29 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 app[...]

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 desired. For inverting operation, the main output cable[...]

5 If your preamplifier is equipped with a balanced main output, it's best to wire the N º 29 for balanced operation, particularly if long cable lengths are required between the preamplifier and the N º 29. (See Figure 3 for the pin assignments of the N º 29's XLR-type inputs.) Connect the XLR-type male line-mount connector to the pream[...]

6 Speaker connections NEVER connect the N º 29'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 N º 29 is equipped with gold-plated, high-current, five-way binding posts for output terminati[...]

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 Ti n Figure 7B: Pigtail connection 5. Solder this connection. A high-wattage [...]

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 panel of the N º 29, then to the AC mains outlet. Con[...]

9 Bridged operation When greater power output is desired, the N º 29 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 N º 29 driving an 8 Ω loudspeaker is capable of delivering 200W RMS. For the best bridged performance, [...]

10 Figure 10: Balanced bridging cable 21 3 21 3 Signal ground (shield) Left-channel XLR male line-mount (rear view) Twisted pair Right-channel XLR male line-mount (rear view) 12 3 XLR female line-mount (rear view) Twisted pair Signal ground (shield) 2. Connect the bridging cable's male XLR-type connectors to the N º 29's left- and right-[...]

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-ended bridging kit. Note: If fabricating the br[...]

12 Car e an d m ain t e n an c e To remove dust from the cabinet of the N º 29, 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. Consult your Mark[...]

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 N º 29 yield excellent results by any standards. However, only those specifications th[...]

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" (1 13.1) 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"[...]

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.[...]