NAD NAD BluOS Streaming Combo - C 658 DAC Pre-Amp + C 298 Power Amplifier Network Streamers
NAD NAD BluOS Streaming Combo - C 658 DAC Pre-Amp + C 298 Power Amplifier Network Streamers
NAD NAD BluOS Streaming Combo - C 658 DAC Pre-Amp + C 298 Power Amplifier Network Streamers

NAD BluOS Streaming Combo - C 658 DAC Pre-Amp + C 298 Power Amplifier


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  • 1800 100 998 For Assistance

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Some products just go together like they were just made for each other. This is definitely the case with the NAD C 658 and C 298, like Yin and Yang they are two halves that complete wholeness to make one significant streaming setup. Just add your choice of speakers to complete your modern 2ch system.

Package Includes:

  • NAD C 658 BluOS Streaming DAC Pre-Amp
  • NAD C 298 Power Amplifier with Purifi Technology


C 658 Features

Key Features:

  • MQA Streaming
  • Dirac Live
  • Dual Subwoofer Outputs
  • Balanced & Line Pre-Outs
  • Phono Input


The NAD C 658 is a new kind of stereo component, one that at once changes preconceptions and opens new possibilities for audio reproduction. You see, there has never before been a component offering such a rich palette of both new and proven technology. Bold statements? Read on.

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 analogue 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 analogue 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 desk top 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 hand–crafted aluminium 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 analogue 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.



Line Input, Pre-Out
THD (20 Hz – 20 kHz) <0.005% at 2 V Out
Signal-to-Noise Ratio >106 dB (IHF; A-Weighted, Ref. 500 mV Out, Unity Gain)
Channel Separation >80 dB (1 kHz)
>70 dB (10 kHz)
Input Impedance (R and C) 22 kohms + 100 pF
Maximum Input Signal >4.5 Vrms (Ref. 0.1% THD)
Output Impedance Source Z + 240 Ohm
Input Sensitivity 93 mV (Ref. 500 mV out, Volume Maximum)
Frequency Response ±0.3 dB (20 Hz – 20 kHz)
Maximum Voltage Output – IHF Load >4.5 V (Ref. 0.1% THD)
Tone Controls Treble >±7.0 dB at 20 kHz; Bass: ±7.0 dB at 60 Hz; Balance: -10 dB
Phono Input, Audio Pre-Out
THD (20 Hz – 20 kHz) <0.01% at 2 V Out
Signal-to-Noise Ratio >84 dB (200 Ohm Source; A-Weighted, Ref. 500 mV Out)
>76dB (MM Cartridge Source, IHF; A-Weighted, Ref. 500 mV Out)
Input Sensitivity 1.44 mV (Ref. 500 mV Out, Volume Maximum)
Frequency Response >±0.3 dB (20 Hz – 20 kHz)
Maximum Input Signal at 1 kHz >80 mVrms (Ref. 0.1% THD)
Line Input, Headphone Out
THD (20 Hz – 20 kHz) <0.005% at 1 V Out
Signal-to-Noise Ratio >110 dB (32 Ohms Load; A-Weighted, Ref. 2 V Out, Unity Gain)
Frequency Response ±0.3 dB (20 Hz – 20 kHz)
Channel Separation >60 dB at 1 kHz
Output Impedance 6 Ohms
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 32 Bit / 192 kHz
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 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, Wi-Fi 5 (802.11 b/g/n)
Dimensions and Weight
Dimensions (W x H x D) 435 x 100 x 405 mm
Shipping Weight 10.1 kg


NAD C 298 Features

Key Features:

  • 185W x 2 Rated Output Power into 8 Ohms
  • 340W x 2 Rated Output Power into 4 Ohms
  • Balanced Line Inputs
  • Single-Ended Line Inputs
  • Input Level Control
  • Purifi Technology
  • Perfect match for the NAD C 658 BluOs Streaming Dac Pre-Amp, as seen below

Redefining the State of the Art with Purifi Technology

NAD has introduced some of the most innovative amplifier technology in its nearly 50 year history, starting with the 3020 on through such cutting edge models as the 2200, the 208, and the M2. Now we are making the amazing new Eigentakt™ (self-clocking) technology, recently introduced to the world in the EISA Award winning Masters M33, available to a wider audience with the very affordable C 298. We are thrilled to provide this unprecedented level of performance. In short, a perfect companion for the C 658 BluOS Streaming DAC pre-amp.

Powerful. Efficient.

The C 298 may be a basic Power Amp, but we have carefully thought through all the use cases typically encountered to create a rich feature content. Selectable balanced inputs make the C 298 a natural for studio use or connection to High End Preamps and Processors. These inputs include a trim control useful for matching to other components. A line out allows further addition of power on the same channel for additional speakers or subwoofers. Auto-sense with selectable threshold is perfect for automating complex systems or hiding the amp out of sight in a cabinet. We even include a Ground Lug that can be very useful for eliminating ground loops and noise in complex multi-unit systems. Added to all this connectivity is a Bridge Switch that turns the C 298 into an amazingly powerful Monobloc Amplifier. Start with one and add a second C 298 later when you upgrade your speakers.


Getting the Basics Right

It is surprising how many seemingly advanced products in the market today often miss many of the most basic requirements for satisfying performance. Low noise circuits, accurate channel balance, proper input and output impedance characteristics, high overload margins and stability with difficult speaker loads. NAD starts by getting these things precisely right and advances from there. Our line inputs, both Balanced and Single-ended, can accommodate all kinds of analog 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 device. These are all details you can hear.

Sophisticated Power

NAD has moved away from the old fashioned and very power hungry linear power supplies and Class AB output stages that waste nearly half of the energy consumed producing heat rather than sound. Instead we have developed even better performing circuits based on switch mode power supplies and Class D output stages. Once thought to be inferior to traditional topologies, NAD’s advanced work in this area has created some of the best performing amplifiers regardless of basic design principle. These new designs are very linear over a wide bandwidth and provide consistent performance into all speaker loads, providing a dramatic advance over previous models.

The generously dimensioned power supply easily allows for 185 watts continuous and over 570 watts instantaneous power for short term musical transients. Innovative Asymmetrical Power-Drive fully utilizes every last watt available with its vast reserves of dynamic power available to accurately reproduce musical transients without distortion or compression. It can operate with any AC mains voltage from 100W to 240W and provides pure DC power to all the various stages of the C 298. This highly efficient supply also provides near perfect regulation of voltage across a wide range of conditions and provides a solid noise-free foundation for the amplifying stages.

Purifi ‘Eigentakt’ Amplifier Technology

Purifi is a Danish technology company that has brought together several of the industry’s leading engineers to apply advanced mathematical modelling to solve the last remaining limitations of audio amplifiers. While there are many good sounding amplifiers on the market today, Purifi has taken a fresh look at every aspect of amplifier performance and found many seemingly small non-linearities that can make a dramatic difference in the overall sound. This return to first principles has resulted in a stunningly simple approach to some remarkably complex problems. With features and technology unmatched by other amplifiers in its class, the C 298 amplifier is an easy upgrade for any system and a surprising partner for the most sophisticated and advanced loudspeakers on the market.


  • 185W x 2 Rated Output Power into 8 Ohms
  • 340W x 2 Rated Output Power into 4 Ohms
  • Stereo Dynamic Power 260/490/570W @ 8/4/2 Ohms
  • 620W x 1 Rated Output into 8 Ohms Bridge Mode
  • Mono Dynamic Power 1000/1100W @ 8/4 Ohms
  • Balanced Line Inputs
  • Single-Ended Line Inputs
  • Input Level Control
  • Line Output for Daisy Chaining
  • 12V Trigger In/Out
  • Auto Turn-on with Selectable Threshold
  • IR In/Out
  • Ground Lug
  • Detachable AC Power Cord



  • THD (20 Hz – 20 kHz)
  • <0.0005 % at 2V out
  • Signal-to-Noise Ratio
  • >120 dB (IHF; 20 Hz – 20 kHz, ref. 2V out)
  • Channel separation
  • >110 dB (1 kHz)
    >100 dB (10 kHz)
  • Input impedance (R and C)
  • Single-ended: 56 kohms + 280 pF
    Balanced: 56 kohms +280 pF
  • Maximum input signal
  • >7.0 Vrms (ref. 0.1 % THD)
  • Output impedance
  • 390 ohms
  • Frequency response
  • ±0.1 dB (20 Hz – 20 kHz)
  • Maximum voltage output -IHF load
  • ≥>7.0 V (ref. 0.1 % THD)


  • Rated output power into 8 Ohms and 4 ohms(Stereo mode) 80 W (ref. 20 Hz-20 kHz at rated THD, both channels driven)
  • 185 W at 8 ohms
    340 W at 4 ohms
  • Rated output power into 8 Ohms (Bridge mode, ref. 20 Hz-20 kHz at rated THD, both channels driven)
  • 620 W at 8 ohms
  • THD (20 Hz – 20 kHz)
  • <0.005 % (1 W to 185 W, 8 ohms and 4 ohms)
  • Signal-to-Noise Ratio
  • >98 dB (A-weighted, 500 mV input, ref. 1 W out in 8 ohms)
    >120 dB (A-weighted, ref. 185 W out in 8 ohms)
  • Clipping power (Stereo mode, at 1 kHz 0.1 % THD)
  • >200 W
  • Clipping power (Bridge mode, at 1 kHz 0.1 % THD)
  • >690 W
  • IHF dynamic power (Stereo mode, at 1 kHz 1 % THD)
  • 8 ohms: 260 W
    4 ohms: 490 W
    2 ohms: 570 W
  • IHF dynamic power (Bridge mode, at 1 kHz 1 % THD)
  • 8 ohms: 1000 W
    4 ohms: 1100 W
  • Peak output current
  • >25 A (in 1 ohm, 1 ms)
  • Damping factor
  • >800 (ref. 8 ohms 20 Hz – 6.5 kHz)
  • Frequency response
  • ±0.2 dB (20 Hz – 20 kHz)
    -3 dB at 60 kHz
  • Channel separation
  • >100 dB (1 kHz)
    >80 dB (10 kHz)
  • Stereo Mode input sensitivity (for 185 W in 8 ohms)
  • Fixed Gain mode: 1.43 V
  • Stereo Mode Gain
  • Fixed Gain mode: 28.6 dB
  • Line In – Balanced and Single-ended
  • Variable Gain mode: 8.5 dB – 28.5 dB
  • Bridge Mode Sensitivity
  • Fixed Gain mode: 3.78 V for 620 W in 8 ohms
  • Line In – Balanced and Single-ended
  • Variable Gain mode at maximum: 1.41 V for 620 W in 8 ohms
  • Bridge Mode Gain
  • Fixed Gain mode: 25.4 dB
  • Line In – Balanced and Single-ended
  • Variable Gain mode: 14.5 dB – 34.5 dB
  • Standby power
  • <0.5 W


  • Gross dimensions (W x H x D)
  • 435 x 120 x 390 mm (17 1/8 x 4 3/4 x 15 3/8 inches)
  • Net weight
  • 11.2 kg (24.7 lbs)
  • Shipping weight
  • 13.6 kg (30 lbs)



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