The NAD C268 is a stereo power amplifier featuring a Class D architecture. It upholds the brand’s design principles for sound reproduction while embracing modern amplification technology. This model stands out for its versatile use and compact size (435 x 100 x 390 mm), weighing 7.3 kg.
At the heart of the C268 lies carefully selected technology: Hypex UcD (Universal Class D) modules. This amplification platform, originally developed by Philips and later refined by Hypex, has become a benchmark in both professional and home audio industries. NAD has customized this architecture to align with its own sonic philosophy, resulting in what they call their HybridDigital technology.
The C268’s switching power supply is a fundamental element of its performance. Capable of delivering nearly 200 watts continuously and over 500 watts in instantaneous peak, this compact yet powerful supply ensures near-perfect voltage regulation, regardless of load conditions. This substantial power reserve allows the amplifier to handle the most demanding musical transients without dynamic compression or audible distortion.
NAD’s asymmetric PowerDrive technology optimizes the use of every available watt. This intelligent circuit continuously analyzes the output stage’s operating conditions—voltage, current, temperature—and automatically switches between two power rails: high voltage for normal loads, high current for difficult impedances. This adaptive approach guarantees optimal performance with any type of connected speaker, from high-sensitivity models to complex loads dropping as low as 2 ohms.
The C268 excels in its ability to adapt to a wide range of setups. Balanced XLR and unbalanced RCA inputs allow integration into any system, from professional installations to sophisticated home setups. The variable gain potentiometer (-∞ to +14.5 dB) on each input makes it easy to match with any preamplifier or processor, eliminating compatibility issues between components from different brands.
The bridging function radically transforms the amplifier’s capabilities. A simple switch converts the two 80-watt channels into a single 300-watt monoblock at 8 ohms, greatly expanding upgrade possibilities. This feature allows you to start with a single C268 in stereo, then add a second unit to create a pair of particularly powerful monoblocks. This modular approach fits perfectly with NAD’s philosophy of upgradable components.
The pre-out line output further expands the system’s possibilities. It allows the addition of extra amplifiers for active multi-amplification, connection of powered subwoofers, or creation of sophisticated multi-zone systems. This output faithfully reproduces the selected input signal, maintaining signal integrity for downstream equipment.
The Auto-Sense system sets the C268 apart from traditional amplifiers. Three sensitivity levels (0.85 mV, 1.7 mV, and 3.7 mV) allow precise adjustment of the audio signal detection threshold. When a signal exceeds this threshold on the active input, the amplifier instantly exits standby mode and becomes operational. This feature is especially convenient for custom installations where the amplifier is hidden in furniture or a technical rack.
The 12V trigger connections (input and output) integrate the C268 into home automation and complex home theater systems. The trigger input allows remote power-on by a compatible preamplifier, while the trigger output can control other equipment, creating a sequential power-up chain. This feature eliminates the need to handle multiple remotes and simplifies daily system use.
The dedicated ground terminal reflects attention to installation details. In complex multi-amplified systems, ground loops can generate unwanted hum. This connection allows for a single grounding point, effectively eliminating these interferences and preserving audio signal purity.
The C268’s chassis adopts the characteristic design of NAD’s Classic series: clean lines, a discreet graphite front panel adorned with the NAD logo, and standard dimensions for integration into any conventional hi-fi rack. The construction prioritizes structural rigidity to minimize unwanted vibrations, with thick steel panels and meticulous assembly.
The minimalist front panel features only a power button and discreet LED indicators: power, protection, and bridge mode. This visual simplicity reflects NAD’s philosophy of focusing resources on performance rather than ostentatious aesthetics. The absence of a fan attests to the exceptional thermal efficiency of Class D amplification—the energy efficiency reaches 92%, compared to about 50% for a traditional Class AB amplifier.
The output terminals accept all types of connections: bare wire up to 10 AWG, banana plugs, spades, or lugs. The quality of these connectors, often overlooked, ensures optimal and durable electrical contact. Removable plastic inserts in the terminals allow the use of banana plugs while complying with European safety standards.
The C268’s Hypex UcD architecture boasts remarkable technical characteristics. Distortion is dominated by the second harmonic, which is naturally more pleasant to the ear than higher-order harmonics. The distortion spectrum is strikingly similar to that of certain tube amplifiers renowned for their musicality, demonstrating that modern Class D technology can combine efficiency with listening pleasure.
The bandwidth extends well beyond the audible spectrum, with a flat response (±0.3 dB) from 20 Hz to 20 kHz. This exceptional linearity ensures faithful reproduction of instrument timbre, without coloration or artificial emphasis. The damping factor above 100 provides precise control of driver movement, which is especially crucial for bass definition.
Stability with difficult loads is a major asset. Unlike many amplifiers that struggle with complex impedances, the C268 maintains its performance even with speakers dropping to 2 ohms. This robustness is complemented by sophisticated protections against short circuits, overheating, and overload, ensuring long-term reliability.
The NAD C 268 is a high-efficiency Class D stereo power amplifier designed to suit a wide range of audiophile configurations. This amplifier offers exceptional versatility thanks to its multiple operating modes and advanced connectivity options, allowing seamless integration into modern high-fidelity systems and home automation installations.
Absolutely. Thanks to its instantaneous current capacity of over 20 amperes and stability down to 2 ohms, the C268 easily handles speakers known for being demanding. The PowerDrive technology automatically adapts the amplifier’s response to the load characteristics, optimizing performance regardless of speaker type.
Bridge mode combines the two channels to create a 300-watt mono amplifier. NAD recommends using only 8-ohm speakers in bridge mode to avoid triggering thermal protection during high-volume listening. Connections are made only to the positive terminals of each channel; the negative terminals are not used in this configuration.
Prejudices against Class D amplification are a thing of the past. The Hypex UcD modules used in the C268 offer distortion and noise that are virtually unmeasurable in the audible band. NAD’s customization of these modules ensures a natural and engaging sonic signature, far from the coldness sometimes attributed to early digital amplifiers.
Universal compatibility is part of the C268’s DNA. The balanced and unbalanced inputs, combined with variable gain adjustment, allow pairing with virtually any preamplifier on the market. The optimized input impedance (33 kOhms unbalanced, 10 kOhms balanced) ensures a proper load for all sources.
Despite its remarkable thermal efficiency, the C268 benefits from natural ventilation. A space of 10 cm above and to the sides is sufficient for optimal heat dissipation. The absence of a massive toroidal transformer allows greater placement flexibility, including near equipment sensitive to magnetic fields.
Laurent
Decent amplifier... Average build quality, sound reproduction lacks warmth... Recommended for home theater use... Much less so for hi-fi audio.
Comment from August 07, 2023 — Experience from February 17, 2023
Luca
Excellent value for money. Perfect in combination with the C658 pre/streamer, powerful and balanced.
Comment from January 06, 2023 — Experience from December 25, 2022
Luc
Very happy, I listened to it in A/B comparison with the C298 and there's a bit less punch / definition in the bass, but the difference is really minimal.
In mono mode for my center channel (BW HTM 71 S2), I'm spoiled : ).
Comment from April 19, 2022 — Experience from April 07, 2022
