No532
DUAL-MONO POWER AMPLIFIER
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No532
DUAL-MONO POWER AMPLIFIER
POWER
The extremely low-noise toroidal power trans-
formers used in the No532 are custom-designed
to Mark Levinson specifications. They feature an
interwinding screen between the coils, which
filters mains-born noise from the secondary power
supply. This helps ensure that any capacitance from
the windings is stepped down, preventing it from
reaching the audio circuits. A separate dedicated
power supply for the voltage-gain stages provides
double isolation between the main audio supply
and the higher current that powers the rest of the
amplifier, ensuring minimal noise introduction.
The power supplies are placed close to each
other to maximize magnetic-field cancellation,
but they are placed as far away from the audio
signal path as possible, further reducing the
potential for interference.
Power amplification is a critical determining factor
in the performance of any home entertainment
system. The amplifier must be powerful and
versatile enough to drive the most demanding
loudspeaker loads, yet it must exercise its power
with the grace and effortlessness essential to high-
quality sound.
To create the optimal power-delivery system, the
chassis of the No532 is compartmentalized to
protect the delicate audio circuits from interference
and noise. The rear portion of the amplifier is
divided into three distinct piers. Control and power
circuitry reside in the center pier, while circuitry
for each audio channel resides in the outer piers.
Power transformers are separately housed at the
front of the chassis. In addition to safely isolating
the audio circuits, this unconventional design
results in very short signal and power-delivery
paths, and creates additional heatsink surfaces for
improved cooling.
SIGNAL PATH
The signal paths for both audio channels of the
No532 are electrically identical and contain no
relays, capacitors or inductors. This helps maintain
very low output impedance levels, and minimizes
nonlinearity. The compact design of the circuitry,
made possible by an advanced new generation of
semiconductors, allows the signal path to be tighter
and shorter than in previous Mark Levinson dual-
mono amplifiers, reducing parasitic capacitances
and minimizing propagation delay and phase shift.
The result is a faster, wider bandwidth with
minimal signal degradation.
The internal layout of the No532 is exceptionally
clean. Because bus bars are used for all high-
current interchanges, there’s no need for point-to-
point wires or ribbon cables. Special care was
taken in the design and implementation of the
voltage-regulator circuitry. Multiple discrete
regulator circuits, with series and shunt elements
custom-tailored to the audio circuits they power,
are mounted on separate boards, close to their
audio signal paths. This minimizes cross talk
and prevents the corruption of low-level signals,
resulting in higher resolution, better bass
definition, greater focus and more precise
control of dynamics.
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o
The N 532 has separate AC Mains boards in
order to ensure that the most appropriate
parts and circuit topology are used for
the incoming voltage.
No532 also provides traditional 12V input and
output triggers to synchronize On/Standby status
with devices that do not include ML Net or Link2
functionality. And an RS-232 port is provided for
control by third-party automation systems such as
those from Crestron and AMX.
THE NO532 EXPERIENCE
Mark Levinson power amplifiers are known – many
would say renowned – for performance that actively
engages critical listeners on an emotional level. They
invite your total involvement in music and movies of
any genre from any source, creating a wondrously
deep, richly detailed soundstage that seems to extend
well beyond the boundaries of your listening space.
I/Os
The first non-Reference Mark Levinson amplifier to
be fully differential, the No532 provides both RCA
and XLR connectors that accept balanced signals
directly into the input stage of the amplifier, with no
additional circuitry. Each phase of the differential
input has identical electrical properties. The input
and voltage-gain stages are tightly matched to
maximize the rejection of common mode signals.
Stopping such noise at the input stage prevents it
from ever reaching the speakers. And because the
amplifier is differential on both the RCA and XLR
inputs, it handles signals in their “native” format,
ensuring that no noise is introduced through
unnecessary signal conversions.
The new No532 dual-mono power amplifier is
endowed with an expressive voice that renders the
entire audio spectrum in astonishing detail with
effortless authority, and it draws on a reserve of
power that even the most demanding speaker load
is unlikely to test.
Equally suitable in a world-class dual-mono system or
a multichannel music and theater system, the No532
combines truly impressive output and remarkable
sound quality – as we’re certain even reticent
audiophiles will readily acknowledge.
The audio signal output path contains 24 output
devices per channel, providing impressive power
while minimizing crossover distortion. The output
devices are arrayed on two separate output stages,
which are placed close to one another for ideally
balanced transfer characteristics and maximum
cancellation of magnetic fields.
Located at the top of each amplifier channel, the voltage-gain (VG) board is made from
Arlon 25N PCB laminate. It uses superior components, including WIMA film capacitors
®
and Vishay Bulk Metal foil resistors. The voltage-regulator (VR) board can be seen in
one view sandwiched underneath the VG board.
CONTROL AND COMMUNICATION
As music and cinema systems continue to grow more
complex, integrating individual components takes
on greater importance. To address the
increasing demand for more flexible control
and communications capabilities, the No532
features ML Net and Link2 functionality.
These are proprietary Mark Levinson
protocols for communication between two
or more similarly equipped Mark Levinson
components. The No532 can be easily integrated
with and controlled by other Mark Levinson
devices, with functionality that includes automatic
on/standby toggling and LED synchronization. The
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No532 Dual-Mono Power Amplifier
Input and output connectors
Two balanced XLR inputs
Two unbalanced RCA inputs
Two “Hurricane” loudspeaker outputs with
banana-plug sockets (banana-plug sockets
not available on the 230V AC models)
Control connectors
Two Link2 ports
One Ethernet port
One 3.5mm mono (tip/sleeve) mini plug
trigger input, 3V–12V DC
One 3.5mm mono (tip/sleeve) mini plug
trigger output, 3V–12V DC
3-Pin IEC standard power connector
Rated output power
20Hz to 20kHz at <0.5% THD, 400W per
channel @ 8Ω, full output from 2.59Vrms
Frequency response
Signal-to-noise ratio
Input impedance
Voltage gain
Within 0.1dB from 10Hz to 20kHz
>85dB, reference level: 2.83Vrms
100 kΩ (balanced); 50 kΩ (unbalanced)
26.8dB
Input sensitivity
2.83Vrms output at 130mVrms input
<20 mΩ, 20Hz to 20kHz
Output impedance
Power requirements
100V~, 120V~, 230V~, 800W, factory-set
for destination country
Dimensions
Height (with feet): 9-9/16¨ (243mm)
Height (without feet): 8-3/4¨ (222mm)
Width: 17-1/2¨ (445mm)
Depth: 21-1/8¨ (536mm)
Weight
Net weight: 121.5 lb (55.2kg)
Shipping weight: 129.5 lb (58.8kg)
Operating environment
Operating temperature: 0º to 35ºC (32º to 95ºF)
Storage temperature: –30º to 75ºC (–22º to 167ºF)
Relative humidity: 95% maximum
without condensation
Each amplifier channel utilizes two current-gain (CG) boards for the
balanced output drivers. The CG boards are made from Arlon 25N,
which was chosen for its superior dielectric characteristics.
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©2008 Harman International Industries, Incorporated.
All rights reserved.
Mark Levinson and the Mark Levinson logo are trademarks
of Harman International Industries, Incorporated, registered in the
United States and/or other countries.
Bulk Metal is a registered trademark of Vishay Intertechnology, Inc.
Features, specifications and appearance are
subject to change without notice.
Part No. ML532LIT 8/08
www.marklevinson.com
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