NAD C658/C298 Bundle

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NAD C658/C298 Bundle | C 298 Digital Stereo Power Amplifier & C 658 BluOS® Streaming Preamplifier

Daniel Roth
hifi profi

06151171048 [email protected]

Profi Opinion

"Separating the preamp and power amp makes sense for several reasons. Interference of unwanted high frequencies from the preamplifier clock signals do not reach the power amplifier where they would be audible. Separate power supplies ensure low noise. This is how the high-quality HiFi chain succeeds. "

Important notes:

Ensure balanced cable connection of both devices via XLR.

C 298

Digital stereo power amplifier

The innovative and extremely powerful NAD C 298 stereo power amplifier is not only the perfect amplifier for a combination with the NAD C 658 streaming preamplifier, but also an ideal playing partner for any other preamplifier. The exclusive combination of NAD’s own HybridDigital concept with intrinsic clockTM technology developed by the Danish company Purifi ensures absolutely distortion- and noise-free reproduction. The amplifier is equipped with adjustable RCA and balanced XLR inputs and has a continuous output power of 2 x 340 watts and an impulse power of 2 x 490 watts (each at 4″). If required, the C 298 can be operated in bridge circuit and then even mobilizes a power of 620 or 1,000 watts (duration/pulse at 8″).

C 658

BluOS® Streaming Preamplifier

The NAD C 658 is a new type of stereo component that opens up completely new possibilities for audio reproduction. With its two optical and two coaxial digital and analog high-level inputs, the preamplifier is not only ideally equipped for the playback of all classical music sources, but also for all modern and future media.® module not only streams music from your smartphone or tablet in the highest aptX® HD quality, but also sends it further to another Bluetooth® receiver, e.g. a wireless headphone.

Via BluOS®, the C 658 connects to the home LAN or WiFi as well as online streaming services or Internet radio stations and other BluOS® players or music servers registered in the network. But that’s not all: Two MDC slots are available on the back of the preamplifier to accommodate modules for connecting HDMI A/V sources or future technologies. And to ensure that the stereo system always sounds its best, the integrated Dirac Live® room correction precisely adjusts the sound parameters of the C 658 to the acoustics of the listening room.

HybridDigitalTM Purifi intrinsic clockTM amplifier

In the almost 50-year history of the company, NAD has already debuted numerous innovative amplifier technologies. Starting with the classic 3020 with its enormous current delivery capability up to the Class D flagship M2. August 2020 saw the release of the NAD M33, a brand new high-end streaming integrated amplifier that is the world’s first to use the innovative new Purifi intrinsic clockTM technology and has already promptly won the EISA award for best “smart amplifier 2020/21”.

With the new C 298 stereo power amplifier, NAD now wants to make the unique Purifi intrinsic clockTM amplifier technology available to a wider audience. It is the perfect companion for the BluOS streaming preamplifier C 658 and convinces with an enormous performance.

Purifi is a Danish technology company where some of the leading developers in the hi-fi industry aim to identify and eliminate the last remaining weaknesses in digital amplifier technology. The current state of their work resulted in the Purifi intrinsic clockTM amplifier, which NAD is the first company to manufacture under license and has so far used exclusively in the BluOS streaming amplifier M33.

The Purifi intrinsic clockTM technology impresses metrologically with extremely low intermodulation distortion, a particularly low distortion factor of only 0.005% over the entire frequency response and the complete power bandwidth, and minimal inherent noise.

The development of the intrinsic clockTM technology was pioneered by the realization that a memory effect occurs in the components in the output filter of the amplifier. This phenomenon, called hysteresis, obviously leads to the well-known tonallosses of conventional digital amplifiers. Through a modification of the output stage and the clever algorithms of the intrinsic clock technology, Purifi managed to significantly reduce the hysteresis effects. Another advantage of intrinsic clockTM power amplifiers is that they are absolutely insensitive to changing speaker. Their extremely low output impedance also results in a very high damping factor, which translates into absolutely clean and controlled bass response.

Enormous power reserves

Instead of old-fashioned linear power supplies and Class AB amplifiers, which convert almost half of the required energy into heat instead of power, NAD uses only switching power supplies and Class D power amplifiers in its current amplifiers. This design operates very linearly over a wide bandwidth and provides uniform power to all speaker, which is a dramatic advance over earlier techniques.

The large dimensioned power supply of the C 298 enables the power amplifiers to deliver an enormous continuous power of 2 x 340 watts (into 4 ohms) and up to 2 x 570 watts impulse power (into 2 ohms). The innovative asymmetrical power drive technology uses every single available watt to provide enormous dynamic reserves to accurately reproduce music without distortion or compression. In addition, the highly efficient power supply convinces over its entire operating range a nearly perfect voltage regulation and thus ensures a solid, noise-free power supply of the amplifier stages.

BluOS® Multiroom streaming in HD quality

BluOS® is an innovative wireless system that allows you to stream music throughout your home. The associated user interface is one of the few solutions in the world to stream uncompressed high-resolution 24 bit / 192 kHz music data to the players integrated in the network. BluOS® uses only the local network to transfer music and organize the platform, and is controlled by the BluOS® app available for smartphones and tablets or a Windows or Mac computer. Since BluOS® is multi-room capable, up to 64 zones can be integrated and controlled either synchronously with an audio stream or individually with different programs at different volumes. Bluesound understands numerous file formats from MP3 to MQA Studio Master quality. Whether streaming music services, your own music library on a hard drive or Internet radio with BluOS® you always have access to your favorite music throughout the network.

By the way, BluOS® can also be integrated into some innovative home automation systems, so that then, in addition to the intelligent control of lighting, heating and other home technology, it is also possible to operate a BluOS® Multiroom system via the Smart Home panel. The driver software for the systems of the manufacturers Control4, Creston, ELAN, iPort, Lutron, Push, RTI and URC is available for download from the Bluesound homepage.

Dirac Live® software for correction of room acoustics and impulse reproduction

Dirac Live® is an innovative room correction system whose basic function is to calibrate an audio system to the acoustics of the listening room. But in addition to adjusting specific frequencies, Dirac Live® uses advanced algorithms to analyze the impulse response of the played audio signals. In this way, possible deviations between the impulses contained in the original signal and their reproduction are corrected so that the hi-fi system sounds more balanced, natural and spatial. While the NAD M17.2 has the full version of Dirac Live® on board, the other devices with this feature have the Light version, which only processes the particularly problematic low frequencies up to 500 Hz. An upgrade to the full version is possible at any time.


  • HybridDigitalTM Purifi intrinsic clockTM amplifier
  • Continuous output power: 2 x 185 W into 8 ohms, 2 x 340 W into 4 ohms
  • Pulse power: 2 x 260 W / 2 x 490 W / 2 x 570 W (into 8/4/2 ohms)
  • Impulse power in bridge circuit: 1,000 W into 8 ohms, 1,100 W into 4 ohms
  • balanced XLR inputs
  • gold plated RCA inputs
  • adjustable input level
  • High level output for looping the audio signal through to further power amplifiers
  • Inputs and outputs for 12 V trigger signals
  • adjustable sensitivity for automatic power on
  • Inputs and outputs for IR
  • Ground terminal
  • Separate power cable

Main features

  • BluOS® Network Streamer
  • ESS Sabre D/A converter with 24 bit / 192 kHz resolution
  • Support of the Studio Master format MQA
  • Dirac Live® room correction (light version, upgrade optional)
  • integrated bidirectional Bluetooth® aptX® HD module
  • AirPlay 2
  • BluOS® voice control via Siri
  • 2 analog high level inputs
  • Phono MM input
  • 2 optical and 2 coaxial digital inputs
  • balanced XLR and RCA preamplifier outputs
  • 2 subwoofer outputs
  • 2 slots for MDC modules, currently DD HDM 2
  • Gigabit Ethernet
  • Dual band WiFi a/c/n
  • USB 2.0 port
  • High level headphone output
  • Trigger input and output
c298 produktfoto HiFi-Profis
c658 produktfoto HiFi-Profis

Flexible application possibilities

The C 298 may appear at first glance to be a simple stereo power amplifier, but NAD engineers have carefully considered all applications to create the most universally applicable power amplifier possible. For example, the C 298 has balanced inputs so that it is also equipped for professional studio use and connection to high-end preamplifiers and processors. Thanks to its variable input sensitivity, the C 298 can be perfectly integrated into constellations with additional amplifiers or active speakers and subwoofers – the high-level preamplifier output required for this is already part of the equipment package. A sensitivity-adjustable automatic switch-on function facilitates the operation of complex systems and enables hidden operation of the amplifier. The ground clamp prevents ground loops and hum interference in audio systems with multiple amplifiers. Finally, the C 298 can also be operated with a bridge circuit if required, which makes it an amazingly powerful monoblock amplifier. Start with one C 298 and add a second later as you upgrade your speaker.

Basic requirements

It’s amazing how many seemingly advanced products on the market today often don’t even have the basic requirements for reliable, great-sounding operation. NAD, on the other hand, understands the importance of low-noise circuitry, accurate channel balance, correct input and output impedance characteristics, large overload reserves, and stable amplification even with difficult speaker. NAD’s engineers take these fundamental aspects into account in their work and continually develop them further.

For example, the C 298’s high-level inputs whether balanced XLR or conventional RCA jacks are suitable for all types of analog audio sources because they have ideal input impedance with linear, ultra-low noise buffer amplifiers to prevent tonal degradation due to mismatch. Details you can hear.

MQA music in studio master quality

MQA is not a new file format, but an innovative way to package large music files with a complex encoding, an efficient compression technique and a digital signature in such a way that even original studio master recordings in 24 bit/ 192 kHz format can be packaged in comparatively small data packages and made available online. For this purpose, the music data is packaged in arbitrary containers such as ALAC, FLAC or WAV. When played back via a decoder integrated in BluOS®, the player unpacks the file completely again and returns it to its original format, the studio master file, without any losses.

Apple AirPlay 2

The C658 integrates with an Apple network via AirPlay 2 and then can be selected directly as a playback device for your music stream via your Mac, iPhone or iPad. And if you have activated Siri voice control on your Apple device, all you need to do is say “Hey Siri, play the latest Paul McCartney album” or “Hey Siri, play NDR 2” and your NAD HiFi system will start playing immediately.



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