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connected. Pre-filtering the AC line using capacitors and thermistors
helps prevent damage from an occasional or prolonged influx of surges
and spikes. An AC mains relay can be switched off when called upon by
one of the Nº383’s other protection systems.
Thermal protection is controlled by four sensors mounted on each
rail of the left and right channel output stages. If a sensor detects exces-
sive heat, it instructs the amplifier to switch itself off. Thermal switches
located inside each transformer housing will disconnect power if the
transformer overheats.
Soft-clip circuits are used to prevent high-energy, high-frequency ring-
ing artifacts from reaching and damaging loudspeakers if the amplifier
is over-driven.
When the amplifier is over-driven for prolonged periods, or if a loud-
speaker cable or output device has shorted,
over-current protection
switches the amplifier off.
DC servos are used to correct for potentially damaging DC-offset from
a source component. As with other Mark Levinson components, the
correction range is ±1V. If the problem exceeds the servo’s range, the
amplifier will be switched off.
the remote control
& user experience
A newly designed remote offers complete control in a small and elegant
package. External control by IR is also offered via an eighth-inch mini-
jack on the rear panel, should the Nº383 be inside a cabinet where the
IR commands cannot reach.
The user interface of the Nº383 is rooted in the advanced design of the
Nº32 Reference Preamplifier. Large knobs for volume and input select
help the unit retain the tactile benefits and functionality of traditional
preamplifier designs. Of particular interest, inputs may be named ap-
propriately, and the selector knob cycles only between those inputs that
are actually used. In other words, the Nº383 can operate as if it were
custom-designed for each source component.
communication The Nº383 features a software-controlled operating system that can be
updated via its RS-232 port, located on the rear panel. Full compatibil-
ity with older Mark Levinson Linking communications buses makes
the Nº383 ideal for customers who use Mark Levinson source compo-
nents.
Two eighth-inch mini-jacks are provided to facilitate DC-trigger con-
trol. Triggers are set for level input and output.