Flexible and powerful.
NAD C298 – 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 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.
More about the NAD C298
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 (at 4 Ω) and up to 2 x 570 watts impulse power (at 2 Ω).
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.
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 NAD C298 has balanced inputs, so it’s ready for professional studio use and connection to high-end preamps 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.
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 the 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 from mismatch. Details you can hear.
- Continuous output power in stereo mode at 8 Ω: 2 x 185 W (20 Hz – 20 kHz at specified distortion factor)
- at 4 Ω: 2 x 340 W (20 Hz – 20 kHz at specified distortion, at 4 Ω)
- Continuous output power in bridge circuit: 1 x 620 W (20 Hz – 20 kHz at 8 Ω)
- Pulse power in stereo mode (at 1% distortion, 1 kHz, at 8 Ω): 2 x 260W
- at 4 Ω: 2 x 490 W
- at 2 Ω: 2 x 570 W
- Pulse power in bridge circuit at 8 Ω: 1 x 1,000 W
- At 4 Ω: 1 x 1,100 W
- Distortion factor (20 Hz – 20 kHz): <0.005 % (1 to 185 W at 4 and 8 Ω)
- Noise-to-voltage ratio (A-weighted): >98 dB (500 mW input, 1 W power at 8 Ω); >120 dB (185 W power at 8 Ω)
- Maximum output current: >25 A (at 1 Ω, 1 ms)
- Attenuation factor: >800 (8 Ohm, 20 Hz – 6.5 kHz)
- Input sensitivity (for 185 W at 8 ohms): 1.43 V
- Frequency response: ±0.2 dB (20 Hz – 20 kHz), -3 dB (60 kHz)
- Distortion factor (20 Hz – 20 kHz): <0.0005 % at 2 V output level
- Noise-to-noise ratio (A-weighted): >120 dB (IHF, 20 Hz-20 kHz, at 2 V output level.
- Input impedance (R and C): RCA and XLR: 56 kΩ + 280 pF
- Maximum input level: >7.0 V (at 0.1 % harmonic distortion)
- Output impedance: 390 Ω
- Frequency response: ±0.1 dB (20 Hz – 20 kHz)
- Maximum output voltage: >7.0 V (at 1 % harmonic distortion)
- Standby power consumption: <0.5 W
- Dimensions (W x H x D): 435 x 120 x 390 mm
- Weight: 11.2 kg
- Carton weight: 13.6 kg