Mark Levinson 27.5 User Manual

1
Unpacking and placement
Unpack your Mark Levinson
®
Nº27.5 Dual Monaural Amplifier, and
keep all packing materials (you may need them for future transport).
Because of the Nº27.5's weight, handles are provided front and rear so
two people may lift and carry the amplifier comfortably and without
risk of injury.
Carefully inspect the product for damage and flaws. If you discover
any, see your Mark Levinson dealer immediately.
To get the best performance from the Nº27.5, keep the speaker cables
as short as possible. Locate the Nº27.5 as close to your loudspeakers as
practical.
Locate the Nº27.5 at least three feet away from your turntable and
preamplifier. Otherwise, the Nº27.5 may induce hum in these sensitive
components.
You may place the Nº27.5 in a cabinet or on a shelf, but you must
provide adequate ventilation to prevent overheating. Make sure to
maintain the clearance provided by the Nº27.5's feet, and maintain
adequate clearance above the unit (for unrestricted air flow through
the heatsinks and through the vents in the bottom of the chassis). For
this reason, we recommend against placing the Nº27.5 on deep-pile
carpet.
The Nº27.5 has thermal sensors located near each group of output
devices. If the heatsink temperature becomes excessive, these sensors
will shut off the amplifier before damage results. After a brief cooling
period, you can reactivate the amplifier via the front-panel switch. If
this occurs regularly during normal use, ventilation may be
inadequate. If there's adequate ventilation and the problem persists,
see your Mark Levinson dealer immediately.
For custom installations and cabinetry, this information may be helpful.
■ All temperature measurements are made at the top of the
heatsink, 3.5" behind the front plate.
■ Normal heatsink temperature at idle after warm-up, with
unrestricted airflow at 22°C (72°F) ambient temperature: 35°C
(95°F).
■ Maximum permissible heatsink temperature before thermal
protection is activated: 80°C (176°F).
A mechanical drawing is included in this manual (see "Dimensions").
For your protection, review "Important safety instructions" before
you install your Nº27.5.
Unpacking
Placement
Ventilation
Custom installations
PRECAUTION

Mark Levinson 27.5 Specifications

General

Voltage Gain	26 dB
Frequency Response	20Hz - 20kHz
Total Harmonic Distortion	<0.1% at rated power
Input Sensitivity	1.5V
Signal to Noise Ratio	>80dB
Type	Solid-state
Power Output	100 watts per channel into 8Ω (stereo)