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Extracted text from Nad M 15 Brochure (Ocr-read)
Page 1
and user preferences are set, the M15 operates very much
like our stereo preamplifi ers. Just select the desired source
- audio or video - set the volume, and hang onto your hat
as the M15 takes you deeply into the essence of the music
or movie you are about to experience.
Our User Interface uses a clear front panel display as well
as an on screen display that provides setup information
directly on your connected TV screen. This is where the
M15 can be customized to refl ect your specifi c needs and
desires. Surround format preferences, level matching of
inputs (so there wont be an annoying jump in volume when
you switch sources), and even the renaming of inputs can
all be set in these simple two layer menus.
ONE REMOTE
The M15 is supplied with the latest iteration of NADs
renowned remote control, the HTRM (Home Theatre
Remote - Masters Series). This smart remote can learn
the commands of any IR remote for any other component.
The innovative learning circuit can easily memorize any
command (including many that other remotes fail on), and
can also memorize a sequence of commands (we call this a
macro) to simplify the operation of your entire audio video
system.
We use a logical layout of keys that are supplemented
by a two-line LCD display to keep you informed of which
component you are controlling and which command is
being sent. We strongly believe that this combination of
keys and display creates the easiest and most satisfying
user interface of any remote control. Once familiar, most
operations can be completed using the sense of touch
alone, allowing you to stay focused on the video picture of
your program. In darkened rooms, the HTRM automatically
illuminates its keys and display for easy viewing.
The HTR M also includes a PC interface for advanced
programming, and easy backup or cloning of your particular
HTR M setup. Simply connect via USB cable to a computer
running MS Windows and load the supplied program.
Commands for various components can be stored, and
complex macros can be easily confi gured and downloaded
into the HTR M.
Special attention has been paid to the ergonomics of the
HTR M, and youll fi nd it feels right, whether you are right
or left handed, and whether you operate it with one hand
or two. Due to the power saving features of the HTRM, the
4 AA batteries have a long life and, when necessary, are
inexpensive to replace. The display will inform you when
the batteries need replacement.
LUXURIOUS DESIGN
The design brief reads: The industrial design must create a
physical presence that is powerful, dynamic, and solid, yet
refi ned and elegant. We wanted a design that will still look
fresh and new a decade from now, a design with classic
proportions and understated details.
Intelligent use of aluminum extrusions, zinc castings, and
heavy gauge steel results in a chassis that is as rugged as
it is handsome. Innovative use of specialized coatings and
plating results in a product that will retain its good looks for
many, many years to come.
COMPATIBLE AND UPGRADABLE
The M15 interfaces perfectly with the majority of consumer
audio and video formats including the latest, HDMI.
Additionally, the operating and decoding software can be
upgraded if and when new features and formats become
available.
With rear panel IR remote input and outputs, programmable
12V triggers, and an RS-232 port, the M15 is highly
compatible with many of the advanced control systems
such as AMX and Crestron.
SECOND ZONE DOUBLES YOUR PLEASURE
A completely independent second audio and video zone,
with its own remote control, is part of the M15 package.
This line level output has independent source and volume
selection, and is ready to interface with outboard amplifi ers
and controllers to send music an pictures to another room
in your home.
POWER SUPPLY
The heart of every electronic component is its power supply.
Taking the raw current from the wall socket and creating
stable, clean DC voltages is crucial to obtain the maximum
performance of every circuit in the M15. Based on a custom
wound and shielded toroidal transformer, the M15 employs
three secondary voltage taps, one for each of the sections
of the preamp; audio, video, and digital. These feed into
independent rectifi ers and multi-stage regulators to obtain
pure and stable voltages for each individual circuit. By
keeping them completely separate, any possible cross
contamination is prevented.
AUDIO PERFORMANCE FEATURES
Tone controls, AV presets, and direct access to sub, center,
and surround levels allow unprecedented control of the
sound fi eld. Centre channel tone control operates in
Page 2
the presence region of the human voice to improve the
intelligibility of dialog. This is especially effective for many
Dolby processed recordings. AV Presets take a snapshot of
any combination of speaker selection, level, and crossover
frequency, to be recalled with just a couple of button presses
of the remote control. You could, for example, have different
setups for music and movies, or even settings for different
types of music or different surround modes. Direct access
to the subwoofer, center, and surround speaker levels,
without calling up menus, allow for on-the-fl y adjustments
without interrupting the video program.
Premium parts from renowned suppliers like Burr
Brown, Wolfson and AKM, are used in classic NAD circuit
confi gurations to provide the low distortion and sonic
realism NAD is famous for. With full 24 bit 192kHz analog-
to-digital and digital-to-analog conversion, the M15 can
fully exploit the best source material available today and for
the foreseeable future. Unusually, the M15 uses multiple
two-channel DACs rather than the 8 channel DACs favored
by many of todays surround sound processors. We have
found that the sonic performance of the two-channel DACs
used in a dual differential mode, is well worth the extra cost
of this confi guration.
Unprocessed analog inputs, whether stereo or via the 7.1
input, remain in the analog mode, sometimes known as
bypass mode. If a digital processing mode is selected,
these signals are digitized using a 128x over-sampling
Sigma/Delta ADC that employs a linear phase digital anti-
aliasing fi lter to prevent any trace of ripple in the audio
band. This superb quality ADC operates at 192MHz and full
24 bit resolution.
Super high-speed (8 MHz band width) low distortion
(0.00008% THD) amplifi ers are use for analog input and
output buffers. These FET OPAmps feature high slew rate
and are capable of the high output current required by this
application. Low noise and superb dynamics are assured.
VIDEO PERFORMANCE FEATURES
The M15 can easily handle todays high resolution video
signals, with support for most analog and digital video
formats. Professional quality video buffer amplifi ers feature
150MHz open loop bandwidth with super low phase shift
and distortion.
HDMI switching is available for two sources. This newly
developed high resolution digital audio and video format
allows encrypted transmission of high resolution (HDTV)
signal formats without passing through analog conversion.
The M15 is also capable of transcoding, or upconverting
Composite and S-Video signals to Component Video
output. Through the use of the highest quality components
and digital comb fi lters, the video quality of Composite and
S-Video is fully preserved.
The on-screen-display (OSD) is simple and effective, and
is completely bypassed when not in use to preserve video
resolution. It is also available on component and Zone 2
outputs. There is also a bypass Component Video Output
that even excludes the OSD switch to provide a reference
quality signal.
DIGITAL PERFORMANCE, PERFECTED
The M15 is a clean sheet design, evolved over several years
of intense development. Based around two high-speed 24
bit DSPs, the M15s exemplary DSP topology gives better
noise and distortion performance than 32 bit fl oating point
designs. New thinking about D/A and A/D conversion
processes led to a circuit design that offers a level of
technical precision and sonic performance unprecedented
at this price level.
DYNAMIC HEADROOM SCALING
Among the many innovative techniques the M15 uses to
squeeze the last ounce of nuance from every music and
movie audio format, Dynamic Headroom Scaling is at the
top of the list. This unique approach maximizes digital
resolution.
What is digital resolution? Think of a picture that has really
fantastic detail in the dark shadows, with every subtle texture
clearly visible; this describes a high resolution picture. It is
like the difference between High Defi nition TV and Standard
Defi nition TV - the HD picture is far more realistic.
Digital audio can also have high or low resolution, depending
on the quality of parts in the analog-digital-analog conversion
process. With the demands for surround sound processing
and post processing, things get more complicated. The
spare headroom required to accommodate these complex
processes means that the 24 bit signal path may only be
working at 12 - 14 bit resolution. This limit is then imposed
on all signals, whether the maximum processing power is
required, or is not required, the headroom margin is fi xed.
While this might be perfectly acceptable performance in
a mid-level AV receiver, it is clearly lacking the detail and
dynamics required for a realistic Home Theatre experience.
This could also limit high resolution audio formats like DVD-
A and SACD to merely CD level performance.
The M15 addresses this problem by dynamically adjusting,
or scaling the amount of headroom, based on the exact
needs of the digital processes running at any given moment.
This unique approach maximizes the audio resolution for
every type of signal and fully utilizes the premium high
performance parts we have included in the M15.