Mark Levinson Portable Multimedia Player N51 User Manual

Nº51

MEDIA PLAYER

PRELIMINARY

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Interior view of the Nº51 displaying

the cast aluminum transport assembly.

it from the audio section and other sections of

the player. The damper bridge is machined

from solid aluminum, increasing mass and

rigidity, thus helping to eliminate flexure

from day-to-day operation and promoting sta-

bility in the physical mechanism. All of these

design attributes work in concert to provide

smooth, quiet, and consistent transport oper-

ation.

Power to the digital audio and video sections

is provided by a switch-mode power supply

that delivers a single constant voltage. This is

distributed to local modules where it is con-

verted to the voltages required for each indi-

vidual circuit. This “point of load” power dis-

tribution technique prevents unwanted inter-

actions caused by uneven supply during peri-

ods of high demand from any single circuit.

Another advantage is the efficient distribu-

tion of power reducing thermal dissipation

and providing a more stable operating envi-

ronment.

The Power Supply

The power supply is the foundation upon

which the audio and video signals are built.

The analog audio outputs utilize a dedicated

power system. This consists of a custom

designed low-noise, toroidal transformer, a

secondary analog power section which per-

forms the first stage of regulation and filter-

ing, followed by a final stage of local regula-

tion in the output section itself.

The Video Processor

The Nº51 provides the video performance

and flexibility that one would expect from a

Mark Levinson Media Player. Custom cali-

brated scaling and de-interlacing are provided

with support for resolutions up to 720p and

1080i. Other features include aspect ratio

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conversion to eliminate letter boxing and pil-

lar boxing. High quality 14-bit / 216MHz

video Digital-to-Analog Converters (DACs)

provide exceptional video output for analog

displays. The On-Screen-Display is unique to

the Nº51 and complements the elegance of

its industrial design.

The Audio Processor

As in the Nº40, the Nº51 employs a Direct

Digital Synthesis circuit incorporating a very

high frequency reference clock. The jitter per-

formance is limited only by the characteristics

of the original clock and yields an extremely

accurate, stable, time reference. All data and

clock signals carrying the digital audio infor-

mation to the DACs are sent via a balanced

Low Voltage Differential Signaling transmis-

sion line. This transmission scheme has

proven effective in the telecommunications

industry, as well as in the Nº40 and Nº390S.

The Nº51 also has the ability to output 44.1,

48, 88.2, or 96kHz signals from the S/PDIF,

AES, or TOS outputs using a dedicated sam-

ple rate converter.

In addition to the standard analog video out-

puts, Nº51 includes a High-Definition

Multimedia Interface (HDMI) output for use

with digital display devices. By using the

HDMI output with a high-definition digital

display, the video signal remains in the digital

domain all the way from the source to the

display. In an analog system, the digital video

signal from the disc is converted to analog in

the player and back to digital in the display,

introducing unnecessary conversions and

possible degradations of the picture.

Digital-to-analog conversion in the Nº51 is

implemented using balanced multi-bit

Sigma/Delta DACs delivering superb techni-

cal performance. In addition to their multi-bit

architecture, these DACs have a differential

current output, which allows us to optimize

The Nº51 also includes a separate monitor

output for use with the Nº40 Media

Processor’s preview function.

Nº51 remote control constructed

from cast aluminum.

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the critical current-to-voltage conversion

stage with dedicated operational amplifiers

possessing superlative rise time and band-

width characteristics. Each channel incorpo-

rates two of these DACs in a dual-mono

mode configuration. Following this, a custom

active filter circuit sums both halves of the

balanced signal and provides excellent com-

mon mode noise rejection in addition to its

outstanding audio characteristics. This

approach to the digital-to-analog circuit topol-

ogy yields extraordinarily low distortion,

improved signal-to-noise ratio and superb,

musical sound quality.

based digital attenuation only to fill in the

gaps for the very lowest level volume control

steps, we do not suffer the loss of resolution

associated with pure digital volume controls.

For music reproduction, the Nº51 offers sep-

arate, fully balanced front left and right out-

puts in addition to a 5.1-channel output.

Additional attention was given to these chan-

nels resulting in a design which maintains

fully balanced signals from the digital-to-ana-

log conversion stage to the output.

Conclusion

The Nº51 represents the next step in the evo-

lution of the Mark Levinson product line. It

combines superb video and audio perform-

ance while remaining true to the core princi-

ples of Mark Levinson. It is designed to ele-

vate the enjoyment of DVD-Videos and CDs

to a remarkably high level. New features,

such as HDMI, allow the stunning video

quality of the Nº51 to be appreciated, while

the tried and true analog audio circuitry

make it a remarkably musical product. The

Nº51 Media Player owner can take pride in

knowing that they have purchased the finest

instrument available for the enjoyment of

their film and music collections.

Following the active filters, the signal passes

through the volume control. The Nº51 vol-

ume control is built around a dual MDAC 12-

bit ladder attenuator, derived from the Nº40.

Volume controls are a critical part of any

audio product, and multi-channel audio is

particularly demanding. Offsets in volume

level between channels can be large, yet

always need to be maintained in a precise

relationship over the entire control range.

The Nº51 volume control uses a hybrid ana-

log/digital attenuation scheme to achieve a

remarkable 100dB control range at 0.1dB res-

olution for the entire range. By applying DSP

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Part # 072-17292 PRELIMINARY

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