Madrigal Audio 23.5, Manual, Page: 1 / 16

1
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.
Unpacking
Placement
Ventilation
Custom installations
PRECAUTION