NAD C 658 BluOS Streaming DAC
Redefining the Architecture of Hi-Fi Playback
As we move deeper into the 21st Century the way music is distributed and enjoyed continues to evolve away from physical media to streaming. It also has moved away from analog to digital. The C 658 has incorporated these fundamental truths to create an entirely new type of component that combines a Network Streamer, a state-of-the-art DAC, and many aspects of the traditional Preamplifier into a single highly cost-effective package. And thanks to NAD’s exclusive Modular Design Construction, it will keep pace with the latest technology, not yet introduced, but inevitably coming in the future. In fact, an optional HDMI 4k switcher module is available now allowing the best sound from any of the many HDMI sources available like game consoles and video STBs. While the C 658 immediately replaces or adds your Streamer, DAC, and Preamp, it also adds many new features you may not be aware of, like a Bluetooth aptX HD transmitter to use with your wireless headphones. The highly flexible outputs allow for a true balanced connection to powered speakers or amplifiers. Single-ended connections for amplifiers and subwoofers are also provided and include an adjustable subwoofer crossover executed perfectly in the digital domain. A highly sophisticated MM Phono input is also included along with line inputs for legacy analog components.
BluOS™ Enabled
Also on board is BluOS, the most sophisticated High Res streaming system available. BluOS natively supports over 15 streaming music services and indexing of over 250,000 tracks from local network sources. The C 658 becomes a node in the BluOS ecosystem allowing high res network streaming to 64 zones and control options for iOS, Android, Windows, and Mac OS phones, tablets, and desktop devices. BluOS also supports all major smart home controllers and is available in a wide range of products making it easy to create a whole-house audio system with the C 658 at its heart.
Traditional NAD Performance and Value
The C 658 is part of our Classic Series of components which have an enviable reputation for giving Music Lovers more enjoyment for less money. If you want a solid block of handcrafted aluminum with gold plated accents you’ll need to look elsewhere. If you want state-of-the-art performance and features in a sturdy no-nonsense package then you have the right address.
High Resolution in Every Detail
Most NAD components have been High Res for 45 years with very wide bandwidth, low distortion, and ultra-low noise. We just never had High Res source material to play. With High Res digital recording and streaming, combined with advanced technology like MQA, record companies are opening their vaults and releasing Studio Master Quality recordings. MQA decoding is available through BluOS Streaming content. The C 658 is pure High Res from input to output and features the ESS Sabre 32bit 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.
Make the Speakers Disappear It’s Not Magic
The C 658 is also the first NAD stereo component to feature Dirac Live room correction*, the most sophisticated and effective room correction available. Dirac corrects the impulse response of your speakers, in addition to the frequency response of your room, for a truly transparent window into the musical performance. When the room resonances are tamed and the transient response is corrected, the result is magical. You have never heard your speakers sound this invisible or this good!
*These features will be implemented via future software upgrades. Note: The C 658 will include a license for Dirac Live with the option for advanced users to upgrade to a Dirac Live Full Frequency version.
Master Quality Authenticated
Master Quality Authenticated MQA is a revolutionary end-to-end technology built into every BluOS Enabled amplifier to capture and deliver MQA music to your speakers in the purest quality. All BluOS Enabled players and systems include a powerful decoder and audio renderer for the millions of the MQA encoded songs, The MQA logo shown in the BluOS app indicates that the unit is decoding and playing an MQA stream or file, and lets you know that you are hearing exactly what the artist recorded and approved in the studio.
SPECIFICATIONS
LINE INPUT, PRE-OUT
THD 20Hz – 20kHz – <0.005% at 2V out
Signal-to-Noise Ratio – >106dB IHF; A-weighted, ref. 500mV out, unity gain
Channel separation
- >80dB 1kHz
- >70dB 10kHz
Input impedance R and C – 22 kohms + 100pF
Maximum input signal – >4.5Vrms ref. 0.1% THD
Output impedance – Source Z + 240 Ohm
Input sensitivity – 93mV ref. 500mV out, Volume maximum
Frequency response – ±0.3dB 20Hz – 20kHz
Maximum voltage output – IHF load – >4.5V ref. 0.1% THD
Tone Controls Treble – >±7.0dB at 20kHz; Bass: ±7.0dB at 60Hz; Balance: -10dB
PHONO INPUT, AUDIO PRE-OUT
THD 20Hz – 20kHz – <0.01% at 2V out
Signal-to-Noise Ratio
- >84dB 200 Ohm source; A-weighted, ref. 500mV out
- >76dB MM cartridge source, IHF; A-weighted, ref. 500mV out
Input sensitivity – 1.44mV ref. 500mV out, Volume maximum
Frequency response – >±0.3dB 20Hz – 20kHz
The maximum input signal at 1kHz – >80mVrms ref. 0.1% THD
LINE INPUT, HEADPHONE OUT
THD 20Hz – 20kHz – <0.005% at 1V out
Signal-to-Noise Ratio – >110dB 32 Ohms loads; A-WTD, ref. 2V out, unity gain
Frequency response – ±0.3dB 20Hz – 20kHz
Channel separation – >>60dB at 1kHz
Output impedance – 6 Ohms
DAC
Supported audio file formats – MP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS
High-resolution audio formats – MQA, FLAC, WAV, AIFF, Supports converted DSD playback via the BluOS desktop app only
Native sampling rates – up to 32bit/192kHz
Bit depths – 16 – 24
BluOS
Supported operating systems – Plays music from network shares on the following desktop operating systems: Microsoft Windows XP, 2000, Vista, 7, 8 to current Windows Operating Systems and Mac OS X versions
User interface mobile operating system
BluOS – Free Android and iOS App available online at Google Play and Apple App store
Supported cloud services
Spotify, Amazon Music, TIDAL, Deezer, Qobuz, HDTracks, HighResAudio, Murfie, JUKE, Napster, Slacker Radio, KKBox, Bugs
Free internet radio – TuneIn Radio, iHeartRadio, Calm Radio, Radio Paradise
Bluetooth quality – Bluetooth aptX HD wireless built-in
Bluetooth connectivity – Two-Way Transmit and Receive
Network connectivity
- Gigabit Ethernet RJ45
- WiFi 5 802.11 b/g/n
DIMENSIONS AND WEIGHT
Dimensions W x H x D** – 435 x 100 x 405mm 17 1/8 x 3 15/16 x 16
Shipping Weight – 10.1kg 22.3lb