Hybrid Digital^TM Purifi own beat^TM amplifier

In the almost 50-year company history, numerous innovative amplifier technologies have already made their debut at NAD - starting with the classic 3020 with its enormous current delivery capacity through to the Class D flagship M2. In August 2020, the NAD M33, a brand new high-end integrated streaming amplifier, was released, which for the first time in the world was equipped with the innovative new Purifi self-clock^TMtechnology works and has promptly been awarded the EISA award as the best "smart amplifier 2020/21".

With the new stereo power amplifier C 298, NAD wants the unique Purifi Eigenrhythm^TM -Bringing amp technology to a wider audience. It is the perfect partner for the BluOS streaming preamplifier C 658 and impresses with its enormous performance.

Purifi is a Danish technology company where some of the leading developers in the hi-fi industry are pursuing the goal of identifying and eliminating the last remaining weaknesses in digital amplifier technology. The current status of their work resulted in the Purifi self-beat^TM-Amplifier that NAD is the first company to manufacture under license and used exclusively in the M33 BluOS streaming amplifier.

The Purifi own clock^TM Technology convinces with extremely low intermodulation distortions, a particularly low distortion factor of only 0,005% over the entire frequency response and the entire power bandwidth as well as minimal inherent noise.

Pioneering for the development of the self-clock^TM Technology was 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 loss of sound of conventional digital amplifiers. By modifying the output stage and using the clever algorithms of the self-clocking technology, Purifi managed to significantly reduce the hysteresis effects. Another advantage of self-clock^TM Power amps is that they are absolutely insensitive to changing speaker loads. Their extremely low output impedance also leads to a very high damping factor, which is reflected in absolutely clean and controlled bass reproduction.

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 only uses switched-mode power supplies and class D output stages for its current amplifiers. This design is very linear over a wide bandwidth and provides consistent performance to all speaker loads, representing a dramatic advance over previous techniques.

The large power supply unit of the C 298 enables the power amplifiers to have an enormous continuous output of 2 x 340 watts (at 4 Ω) and up to 2 x 570 watts of pulse power (at 2 Ω). The innovative asymmetrical power drive technology uses every single available watt to provide enormous dynamic reserves to accurately reproduce the music without distortion or compression. In addition, the highly efficient power supply convinces with almost perfect voltage regulation over its entire working range and thus ensures a solid, noise-free power supply for the amplifier stages.