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Madrigal Audio 23.5 Manual

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Unpacking
Placement
Ventilation
Custom installations
PRECAUTION

Unpacking and placement

Unpack your Nº23.5 amplifier and keep all packing materials for future
transport. Because of the weight of the unit, handles are provided
front and rear so that two people may lift and carry the amplifier
comfortably and without risk of injury.
Carefully inspect your Nº23.5. If you find any damage or flaws, see
your Mark Levinson dealer immediately.
To keep speaker cables as short as possible, locate the Nº23.5 as close
to the loudspeakers as practical.
The Nº23.5 should be located at least three feet away from the
turntable and preamplifier. Otherwise, the Nº23.5 may induce hum into
these sensitive components.
The Nº23.5 may be placed in a cabinet or on a shelf, but adequate
ventilation must be provided to prevent overheating. The clearance
provided by the unit's feet must be maintained to allow unrestricted air
flow across the heat sinks and through the vents in the bottom of the
chassis (placing the Nº23.5 on thick carpeting, for example, may
reduce or eliminate the clearance provided by the feet). Clearance
above the unit must also be maintained to allow air circulation and to
prevent heat buildup.
The Nº23.5 incorporates thermal sensors located near each group of
output devices. If heat-sink temperature becomes excessive, these
sensors will shut off the amplifier before damage results. After a brief
cooling period, the amplifier can be reactivated via the switch on the
front panel. If this occurs regularly during normal use, it indicates that
the ventilation provided for the amplifier is inadequate. If there's
adequate ventilation and the problem continues, see your Mark
Levinson dealer immediately.
For custom installations and cabinetry, this information may be useful:
All temperature measurements are made at the top of the heat
sink, 3.5" behind the front plate.
Normal heat-sink temperature at idle after warm-up, with
unrestricted airflow at 22 C (72 F) ambient temperature: 36.5 C
(97.7 F).
Maximum permissible heat-sink temperature before thermal
protection is activated: 80 C (176 F).
For exact dimensions, see "Dimensions."
For your protection, review "Important safety instructions" before
you install your Nº23.5.
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Summary of Contents for Madrigal Audio 23.5

  • Page 1: Unpacking And Placement

    The Nº23.5 should be located at least three feet away from the turntable and preamplifier. Otherwise, the Nº23.5 may induce hum into these sensitive components. The Nº23.5 may be placed in a cabinet or on a shelf, but adequate Ventilation ventilation must be provided to prevent overheating. The clearance...

  • Page 2: Voltage Selection

    If you wish to change the AC operating voltage of your Nº23.5, see your Mark Levinson dealer. A Nº23.5 typically uses from 225W (at idle) to 1200W (at its rated power into 8 ). It may be powered by a 15-ampere AC mains line. For optimum performance into lower-impedance loads, however, it's recommended that the AC mains outlet used for the Nº23.5 be...

  • Page 3: Signal Connections

    For this type of operation, connect the main outputs of your preamplifier to the left- and right-channel RCA-type inputs (non- inverting) on the rear panel of the Nº23.5. Be sure that the shorting strap is inserted into the XLR-type connectors between Pins 1 and 3.
  • Page 4 After completing the cables, connect the main outputs of your preamplifier to the left- and right-channel XLR-type inputs on the rear panel of the Nº23.5. Be sure to remove the shorting strap between Pins 1 and 3 before inserting the output cable connectors.
  • Page 5 When complete, connect the main outputs of the preamplifier to the left- and right-channel XLR-type inputs on the rear panel of the Nº23.5. Be sure to remove the shorting strap between Pins 1 and 3 before inserting the output cable connectors.

  • Page 6: Speaker Connections

    The Nº23.5 is equipped with gold-plated, high-current, five-way binding posts for output termination to a loudspeaker system. To take full advantage of the sonic quality of the Nº23.5, we recommend that you use high-quality speaker cable (see your Mark Levinson dealer).
  • Page 7 Connecting the speakers When the speaker cables are complete, connect the left-channel + (positive or red) output post of the Nº23.5 to the + (positive or red) input terminal of the appropriate loudspeaker. Connect the left-channel – (negative or black) output post of the Nº23.5 to the –...

  • Page 8: Power Connection

    Connecting the Connect the AC power cord (included in the accessory pack) to the AC power cord AC connector on the rear panel of the Nº23.5, then to the AC mains outlet. To Nº23.5 To AC mains...

  • Page 9: Bridged Operation

    Bridged operation When greater power output is desired, the Nº23.5 may be bridged for monophonic operation into load impedances of at least 2 . Note: Make sure the loudspeaker is rated to handle extremely high power levels. For example, a bridged Nº23.5 driving an 8 loudspeaker is capable of delivering 800W RMS.
  • Page 10 Nº23.5 to the + (positive or red) input terminal of the appropriate loudspeaker. Connect the right-channel + (positive or red) output post of the Nº23.5 to the – (negative or black) input terminal of the same loudspeaker. 4. Repeat this procedure for the other Nº23.5 to be bridged.
  • Page 11 Nº23.5 to the + (positive or red) input terminal of the appropriate loudspeaker. Connect the right-channel + (positive or red) output post of the Nº23.5 to the - (negative or black) input terminal of the same loudspeaker. 4. Repeat this procedure for the other Nº23.5 to be bridged.

  • Page 12: Care And Maintenance

    Care and maintenance Cleaning To remove dust from the cabinet of the Nº23.5, use a feather duster. To remove dirt and fingerprints, we recommend isopropyl alcohol and 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 13: Specifications

    A list of numbers reveals virtually nothing. All technical measurements must be subject to qualitative as well as quantitative interpretation. Measurements of the Nº23.5 yield excellent results by any standards. However, only those specifications that apply to the actual operation of the amplifier are included here.
  • Page 14 Dimensions Figure 13A: Dimensions, 2-1⁄2" Nº23.5, top view 5⁄8" (63.5) (15.9) 1-3⁄4" (44.4) 1" TYP. 1⁄2" TYP. (25.4) (12.7) 18-7⁄8" (479.4) 13" (330.2) 4-3⁄16" 29⁄32" 19" (122.5) (22.9) (482.6) 1-3⁄4" (44.4) 3⁄8" 2-1⁄2" (9.5) (63.5) 3⁄8" 1-1⁄2" (9.5) (38.1) 14-3⁄16"...
  • Page 16 2081 South Main Street, P.O. Box 781 Middletown, Connecticut 06457 USA Telephone: (203) 346-0896 or 344-9300 Fax: (203) 346-1540 ® is a registered trademark of Madrigal Audio Laboratories, Inc. © 9/1993 Madrigal Audio Laboratories, Inc. All rights reserved. 630095-1 Printed in U.S.A.

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