High Resolution Performance: The NAD C 658 BluOS Streaming DAC offers
high resolution performance from input to
output. It features the ESS Sabre 32-bit DAC, one of the best performing DACs on
the market today with its 118dB Dynamic Range and incredibly low jitter spec.
All preamp functions are executed in the digital domain including the same wide
range non-truncating digital volume control used in our Masters Series
components. This offers an incredibly short analog signal path that, rather
uniquely, is identical for all volume settings. Sophisticated active power
supplies provide super clean voltages to all circuits to keep noise and
distortion at the edge of measurability.
- Supported Audio File Formats: MQA, FLAC, WAV, AIFF, ALAC,
ACC, MP3, WMA, and OGG
- Native Sampling Rates: up to 32-bit/192kHz
- Bit-Depths: 16 to 24 bit
Dirac Live Room Correction: The C 658 employs Dirac Live Room
Correction software that delivers optimized sound quality for
your home theater system. The built-in Lite version of the
computer software (for Windows or Mac), with
the option to upgrade to a full-featured version for $99, measures the acoustic
performance of the system within the listening room and optimizes playback
performance to provide the most transparent music reproduction possible. The
setup process is automated and very simple, giving you the control they need to
precisely tune for the best results. With Dirac Live, you can build the perfect
listening environment that corrects for both the timing and colorations in sound
using the supplied microphone and its powerful computer software.
Note: Dirac Live will become available via a network software update later in 2019 (subject to change).
Tone Control + Analog Bypass: The NAD C 658 lets you adjust
Bass (60Hz) & Treble (20kHz) from -7 to +7dB, as well as Balance between the
left & right channels (L10 to R10). Analog Bypass mode allows analog signals to
remain in the analog domain without analog-to-digital conversion. In Analog
Bypass mode, all DSP circuitry is bypassed, but full tone control functions
Analog Line-Level Inputs: The NAD C 658 offers two analog line-level
inputs consisting of stereo RCA jacks. These two analog stereo RCA inputs can
accommodate all kinds of analog line-level source components by offering ideal
input impedance characteristics with linear ultra-low-noise buffer amplifiers to
prevent any sonic degradation caused by inappropriate loading of the source
High-Quality MM Phono Input Stage: The NAD C658 includes a
high-quality MM phono input stage with precisely accurate RIAA equalization,
high overload margins, extremely low noise, and an innovative circuit to
suppress infrasonic noise that is present on all LPs - all without affecting
Optical & Coaxial Digital Input: The NAD C 658 is equipped
with two optical (toslink) digital inputs and two coaxial (RCA) digital inputs.
These digital inputs will support 2ch PCM audio up to 24-bit/192kHz (not
compatible with Dolby Digital/DTS).
USB-A Port: The NAD C 658 is equipped with a rear-panel USB-A port for
connection of a USB mass storage class (MSC) device, such as a thumbdrive or
external hard-drive (an external hard-drive will require separate AC power). The
unit's USB-A port supports playback of a variety of compressed and
high-resolution music files stored on a compatible USB MSC device formatted in
FAT 32, NTFS, or Linux ext4. Your connected USB MSC device will appear as a
local source within the BluOS app on your Apple iOS or Android OS device. Access
and playback of music files stored on your connected USB MSC device will be done
through the BluOS app.
- The USB-A port is not compatible with the direct connection of an
Apple iOS or Android device.
- There is also a rear-panel miniUSB port that is used
for service purposes only (not for consumer use). Only authorized service
personnel can access this miniUSB port.
Bluetooth aptX HD: The NAD C 658 features two-way wireless Bluetooth
capability that is powered by aptX HD for the highest possible sound quality
available. aptX HD supports 48kHz/24-bit LPCM audio over a Bluetooth wireless
connection for a "better-than-CD" listening experience. The C 685 can act as a
Bluetooth Receiver or Bluetooth Transmitter (but not both at the same time). The
Bluetooth Receiver and Transmitter modes are only accessible via the BluOS App.
You can pair multiple devices with the BluOS Streaming DAC, but only one device
can be connected and used at a time (the BluOS Controller app must be used for
pairing). The NAD C 658 has a Bluetooth wireless range of approximately 33'.
- Receiver Mode: In Receiver mode, you can wirelessly stream stored music
and music apps from your smartphones, tablets and laptops to the NAD C 658.
You can control basic playback functions (Play/Pause & Previous/Next Track)
from the included remote, but your Bluetooth source device will have to be
used for more advanced music navigation. The C 658 does not display
song/artist/album information. However, you can view song/artist information
and album art from the BluOS app on your Apple iOS or Android device.
- Transmitter (Headphone) Mode: In Transmitter mode, you can
wirelessly stream analog & digital inputs of the C 658 and BluOS network
content to a set of Bluetooth enabled headphones (only one set of headphones
can be connected at a time). Because the NAD C 658 does not support Receiver
& Transmitter mode simultaneously, you cannot listen to a Bluetooth audio
streaming source on a set of Bluetooth headphones through the C 658. There
is no audio output from the C 658's preamp or headphone outputs when the
unit is wirelessly streaming to a set of Bluetooth headphones.
Note: Make sure the included Bluetooth antenna is installed on the
rear-panel of the unit for wireless Bluetooth connectivity.
Balanced & Unbalanced Preamp Outputs: The NAD C 658 BluOS
Streaming DAC offers both Balanced (XLR) and Unbalanced (RCA) preamp outputs to
connect to your power amplifier. Balanced connections guard against induced
noise and allow long cable runs without compromising sound quality. The preamp
outputs can be set to Variable or Fixed.
- Variable: The volume level of the NAD C 658 is controlled from
the BluOS Streaming DAC's front-panel volume know or the included remote
- Fixed: The output level is fixed and the C 658's volume control
is bypassed. This feature is sometimes referred to as "Cinema Bypass"
because it allows the C 658 to be used for the front channels of a surround
sound system by relegating the volume control function to a surround
Dual Sub Outputs: The NAD C 658 is equipped with two
discrete mono-RCA sub outputs to connect up to two powered subwoofers.
High Current Dedicated Headphone Amplifier: The NAD C 658 incorporates
a discrete headphone amplifier with low output impedance and very high output
voltage capability, enough to drive even high impedance studio monitor
headphones. Connecting a set of headphone to unit's front-panel 1/4" jack will
mute the preamp outputs. Volume, tone, and balance controls are all operable
during headphone listening.
Modular Design Construction (MDC): The C 658 incorporates a unique
feature called Modular Design Construction that is exclusive to NAD. With MDC,
all major digital circuits can be upgraded and replaced to keep the unit forever
young and capable. This NAD innovation is a unique architecture that keeps pace
with the fast-changing world of technology. With MDC, the ability to easily
upgrade a component to include future digital formats is totally unique and
unprecedented. Though installation and setup of any MDC module is
straightforward, you are encouraged to have this upgrade professionally
installed by their authorized NAD dealer. The C 658 comes with two MDC slots for
- Optional HDMI Module: The optional
HDM-2 MDC module (sold separately) adds HDMI audio/video switching
capability to the C 658 with three HDMI input terminals and one HDMI output.
It supports 4K@60 4:4:4, HDR10, and is HDCP 2.2 compliant. With MDC HDM-2
installed, C 658 supports HDMI Control (CEC) and Audio Return Channel (ARC)
functions. Both functions are possible if external devices that also support
both features are connected to the C 658 via HDMI connection
Wired or Wireless Network Connection: The NAD C 658 can
connect to your home network and Internet provider via a hardwired Gigabit
Ethernet (RJ-45) jack connector or wireless WiFi (802.11 b/g/n) connection.
Either network/internet connection allows you to stream music from internet
radio, select online music services and stored music libraries on your network
Note: Make sure the included WiFi antenna is installed on
the rear-panel of the unit if you will be using a wireless WiFi network
BluOS Wireless High-Resolution Multiroom Audio: The
NAD C 658 is part of the
BluOS wireless high-resolution multiroom audio eco-system - consisting of
powered speakers, soundbar speakers, amplifiers, players, and hard-drives. The
BluOS wireless high-resolution multiroom audio ecosystem uses your home's wired
or wireless network to connect multiple Bluesound products and play your music
in perfect sync, or different music simultaneously, anywhere in your home. BluOS can wirelessly transmit lossless music up to 24-bit/192kHz at ultra-fast
speeds with no lag and zero loss in sound quality.
- Compatible Multiroom Audio Sources: The following audio
sources can be used for multiroom audio playback - internet radio (including
TuneIn & iHeart Radio); online music services (including Tidal, Spotify,
Amazon, Deezer, Slacker, and Napster); Bluetooth & USB audio, music
libraries (from computers and NAS drives); and Aux inputs
(analog or digital).
- Number of BluOS Zones: Up to 16 Bluesound devices can
be connected in a strictly wireless environment. Demonstrated practice has
shown that you can create up to 8 groups of 8 Bluesound devices or 4 groups
of 16 Bluesound devices. If you want to connect more than 16 Bluesound
devices, you will need to connect the Bluesound devices to your network
using a wired connection. BluOS can then control up to 64 devices in a
strictly wired environment.
Note: Make sure the NAD C 658 has the latest BluOS software and firmware
BluOS Controller App: The free
app (for Apple iOS 9.3-up, Android OS 4.1-up, Windows XP-up, and Mac OS X
10.7-up) turns your mobile device or computer into a full-featured wireless
remote control for the NAD C 658 and the BluOS wireless multiroom audio system.
The BluOS Controller app on your compatible device uses your home's WiFi network
to connect with Bluesound devices, so you can play all the music you love
anywhere in your home for a wireless multiroom music experience. Get on-demand
access to your music libraries on your home network, stream live Internet radio
from almost any place in the world, or listen to one of the many music services
available on Bluesound, all from the palm of your hand with the easy-to-use
BluOS Controller app.
- Multiroom Audio: Play a different song at the same time
in different rooms, or group all your BluOS enabled devices together and
listen to your favorite music in perfect sync throughout your home.
- Now Playing Screen: Control your music and adjust the
volume in any room, get rich album artwork and detailed artist info, right
from the Now Playing screen. Even check what quality you are streaming at to
ensure the best possible listening experience.
- Individual Songs & Playlists: Tap a song and have it
play instantly, or create and edit playlists on the fly by simply adding
songs or entire albums to the play queue. Playlists can then be saved inside
the app and listened to at any time.
Alexa Compatible: The NAD C 658 BluOS Streaming DAC will
support Amazon Alexa and voice control through an over-the-network firmware
update (now available). Using an Amazon Alexa enabled device (sold separately),
you can use your voice to explore music services, select presets, adjust volume
levels, switch up songs in different rooms, or even group your Bluesound
components together and play your music in perfect sync throughout the house.
Each Alexa voice command will need to start with the phrase "Alexa, ask Blue
Voice to" or "Alexa, Tell Blue Voice to". Alexa Skills for BluOS will need to
be setup through the Amazon Alexa app on your Apple iOS or Android device.
here for more information regarding Alexa setup and voice commands.
High Resolution Audio: High-resolution audio tracks are
either 24-bit/96kHz or 24-bit/192kHz, and contain up to 6.5x more data than
standard CDs, letting you hear all the detail of your favorite music in superior
quality. With full support for hi-res audio, you can stream WAV, FLAC, ALAC,
AIFF, WMA-Lossless, MQA music files over your home's WiFi network or directly
from a connected USB mass storage class device. Bluesound also supports
compressed music files such as MP3, AAC, WMA and OGG. Bluesound has been
designed to work with today's larger music collections, and has
indexed libraries up to 200,000 songs in demonstrated practice (this will depend
on the music's metadata & artwork). Bluesound also offers gapless playback by
default for all supported file music types.
| Compression || File Type || Sampling Frequency || Bit Rate or Bit Depth |
| Compressed || Lossy ||MP3 ||16-48kHz ||192-320
| Lossless ||WMA-Lossless ||up to 96 kHz ||up to 24-bit |
|FLAC ||192 kHz ||up to
| Uncompressed ||AIFF ||up 192 kHz ||up to
Notes: Bluesound cannot index or play AAC files with the
extension ".m4p". These files were purchased in iTunes prior to 2009 and are
subject to copy protection. Apple Consumers with an iTunes Match
subscription can delete and re-download these files free of charge from
their iTunes Cloud
Master Quality Authenticated (MQA): The NAD C 658 will playback and
decodes MQA content from BluOS network audio sources. Master Quality
Authenticated (MQA) is a revolutionary end-to-end technology built into the NAD
C 658 that captures and delivers master quality audio. The C 658 includes a
powerful decoder and audio renderer for the MQA system. This ensures that
MQA-encoded audio files sound exactly like the source. MQA indicators are both
shown on the front-panel display of the BluOS Streaming DAC and in the BluOS app
on your compatible Apple iOS or Android OS device.
Online Music Services: Many popular music streaming services
and internet radio apps are built right into BluOS, giving you an all-access
pass to millions of songs and the freedom to listen to everything you want to
hear. Using the BluOS Controller app, you can instantly discover and enjoy
millions of songs from your existing music services, tune in to your favorite
internet radio stations and podcasts from around the world, or access and listen
to the music collections stored on your smartphone, tablet or laptop on any and
Bluesound in your home. Subscription and purchase fees will apply to online
- Amazon Prime: With a
Amazon Prime Music subscription, you can access over 2 million songs
ad-free and on-demand, as well as curated playlists and personalized
stations. Upgrade to an
Amazon Music Unlimited subscription to access tens of millions of songs.
- Spotify Connect: If you subscribe to
Spotify Premium and have the Spotify App on your
Apple iOS or
Android smartphone, you can stream Spotify to the Bluesound system using
Connect. Spotify is a digital music service that gives you on-demand
access to one of the largest music libraries in the world (over 15 million
tracks and counting). Spotify makes it easier than ever to discover, manage,
and share music with your friends. You can browse music by artist, album,
track, or most popular; and create your own music library with customized
TIDAL is a global streaming service that offers over 30 million songs in
high-fidelity CD sound quality. TIDAL has two pricing tiers; either $9.99 or
$19.99 a month. Both pricing levels allow you to access TIDAL's entire music
library. The $19.99 tier has the added benefit of high-fidelity sound at
- TuneIn: The Bluesound system includes access to more
than 70,000 free internet radio streams from all corners of the globe via
the TuneIn internet radio
service. Just select the TuneIn logo from the main Music menu and browse
among the 70,000 stations neatly organized into popular categories and
select a station that appeals to your mood.
- iHeart Radio: iHeart Radio is a free,
all-in-one digital radio and music streaming service that lets you listen to
thousands of live stations from across the country and allows you to create
personalized custom stations featuring songs from the artist you select and
- Napster: Napster is a
streaming music subscription service (starting a $10 per month) that allows
you to play the full-length songs you choose on demand from a collection of
over 10 million songs, without ads and without having to purchase or
download the music.
- Slacker: Get the sound quality that you deserve with
the new Slacker music
library available in high-quality AAC audio on Bluesound. Listen to music
streams at a bitrate of 320kbps and enjoy all your favorite Slacker stations
in pristine MP3-quality.
- Deezer: Deezer lets you
explore over 53 million tracks (and counting), and discover artists and
tracks you'll love with personalized recommendations from the Deezer
Editors. Bluesound even supports Deezer HiFi for lossless quality ($19.99
- Other Services: Other online music services include
Note: Availability of online music services may vary by
region. Not all services may be available at time of purchase. Some services
may be added or discontinued from time to time based on decisions of the
music service providers or others.
Computer Audio: BluOS lets you easily connect and share
your music collection from a computer or network-attached storage drive and
access up to 200,000 tracks for wireless streaming. The BluOS wireless music system will
pull music from an existing digital music library across the network on your
Windows PC, Mac computer, or NAS drive using Windows or SMB File Sharing
(SAMBA) and the BluOS Controller app for Windows (XP-up) & Mac (OS X
10.7-up). However, File Sharing is not enabled by default on Windows or Mac.
You will have to manually alter these settings in your computer's menu
IR Remote: The included IR remote control handles the key
functions of the NAD C 658, and provides basic playback function for BluOS
network content and Bluetooth audio streaming. The IR remote can also be used to
directly command other NAD products that respond to applicable common remote
control codes. This includes NAD Stereo Receivers, Integrated Amplifiers, and
Preamplifiers. It has additional controls to remotely operate NAD CD Players and
AM/FM Tuners. It will operate up to a distance of 23'. The remote requires two
"AA" alkaline batteries (included).
Note: You can also program universal IR remotes to operate key
functions of the NAD C 658
BluOS Streaming DAC. However, the BluOS app for Apple iOS and Android OS devices
will be required for BluOS network streaming content access.
12V Trigger In/Out: The +12V trigger output lets you turn
on/off another device along with the NAD C 658. The BluOS Streaming DAC can also
be turned on/off by another device using the +12V trigger input. The units' +12V
trigger input and output consists of female 3.5mm jacks.
IR In/Out: The IR input is used to control the NAD C 658
using an optional infrared repeater system (sold separately) or the IR output of
another component. The C 658's IR output can be used for control of another NAD
component. The units' IR input and output consists of female 3.5mm jacks.
Auto Standby w/ Auto Sense: The NAD C658 BluOS Streaming DAC
can be setup to automatically go into standby mode if there is no user interface
interaction and no active source input for 20 minutes. The Auto Sense feature
enables the C 658 to wake up from standby mode when triggered by a network
source or active source input. Auto Standby must be set to "On" for the Auto
Sense feature to work.