NAD - C 658 BluOS Streaming DAC/Preamplifier

Model: C 658
  • Description
  • Features
  • Specifications
  • DAC, Preamplifier, and Streamer Offers MQA Decoding and Instant Access to Wireless High-Res Music: BluOS-Enabled NAD C 658 Also Features MM Phono Preamplifier and Headphone Amp

    A triple-threat DAC, preamplifier, and BluOS streamer, NAD C 658 lets you stream high-resolution music from nearly 20 providers while offering full MQA decoding on all digital inputs and supporting two-way aptX HD Bluetooth. Its audiophile-caliber ESS SABRE DAC ensures premium fidelity, while a built-in MM phono preamplifier, dedicated high-current headphone amplifier, and Dirac Live Room Correction software make the fully modular C 658 a veritable audio decathlete equally able to serve digital and analog needs. Ditto the balanced preamplifier output, stereo subwoofer outputs, and RS-232 serial port that enhance its flexibility. Meanwhile, NAD's unique Modular Design Construction (MDC) means C 658 can always be easily upgraded to keep up with changing technologies, giving you a larger return on your investment and complete peace of mind. 100% Music Direct Guaranteed.

    High-Resolution Streaming and Networking with BluOS Technology
    C 658 boasts one of the most sophisticated high-res streaming systems available. BluOS natively supports nearly 20 streaming music services and indexing of over 250,000 tracks from local network sources. In effect, 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 and affordable to create a whole-home audio system with C 658 at its heart.

    Two-Way Wireless aptX HD Bluetooth
    C 658 also features two-way wireless Bluetooth capability powered by aptX HD for the highest-possible Bluetooth sound quality. You can easily stream music from smartphones, tablets, and laptops or can also use the device's integrated two-way Bluetooth feature and effortlessly stream music playing on the amp to any pair of Bluetooth-enabled headphones.

    Optimize Your Listening Environment with Dirac Live Room Correction 
    Dirac Live Room Correction software delivers optimized sound quality for your home-theater system. The built-in Lite version of the software, with the option to upgrade to a full-featured version for $99 USD, measures the acoustic performance of the system within the listening room and optimizes playback performance to provide transparent music reproduction. The set-up process is automated and simple, giving you the control you 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 software.

    Upgradability Via Modular Design Construction 
    NAD's Modular Design Construction (MDC) means all major digital circuits on C 658 can be upgraded and replaced to keep the unit young and capable. This unique architecture keeps pace with the fast-changing world of technology. With MDC, the ability to easily upgrade a component to include future digital formats is money-saving and unprecedented. C 658 comes with two MDC slots for future expansion.


    1. BluOS Network Streaming with MQA Decoding
    2. ESS Sabre DAC
    3. Dirac Live Room Correction
    4. Gigabit Ethernet
    5. Dual Band Wi-Fi a/c/n
    6. 2-way Qualcomm aptX HD Bluetooth
    7. 2 x MDC Slots for Future Expansion
    8. MM Phono Input
    9. 2 x Line Inputs
    10. 2 x Optical Inputs
    11. 2 x Coax Inputs
    12. Balanced Preamp Output
    13. Preamp Output
    14. Stereo Subwoofer Output
    15. High Current Headphone Out
    16. USB socket for adding optional wireless output module
    17. IR In with Learning Function
    18. Trigger Out/In


    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

    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)
    Maximum input signal at 1kHz : >80mVrms (ref. 0.1% THD)

    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

    Supported audio file formats: MP3, AAC, WMA, OGG, WMA-L, ALAC,OPUS
    High resolution audio formats: MQA, DSD, FLAC, WAV, AIFF
    Native sampling rates: up to 32bit/192kHz
    Bit depths: 16 – 24

    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: luOS – 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, 802.11 b/g/n WiFi

    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)



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