Trickled down from NAD’s Masters Series, the C 399’s HybridDigital nCore amplifier can deliver 180 Watts per channel continuous power, and 250 Watts per channel instantaneous power. Highly efficient and remarkably powerful, the HybridDigital nCore amplifier can produce musical transients effortlessly. The design is renowned for its wide bandwidth, flat frequency response, clean clipping behaviour with instant recovery, high current capability, and stability into demanding low-impedance speaker loads. Noise and distortion are vanishingly low under all operating conditions. The minute levels of harmonic distortion are dominated by sonically benign second and third harmonics. The Hypex nCore design enables the C 399 to produce neutral, distortion-free sound even at very high listening levels, with exquisite detail, superb portrayal of space, and thrilling dynamics.

NAD C 399 Hybrid Digital DAC Amplifier:
Type: Hybrid Digital Integrated Stereo Amplifier
Amplifier Topology: Class D (HybridDigital nCore with Purifi Eigentakt output stage)

Power Output (Continuous, both channels driven):
Continuous Power: 180W per channel into 8Ω and 4Ω (20Hz - 20kHz, at ≤0.003% THD)
Instantaneous Power: 250W per channel
Power Bandwidth: 20Hz - 20kHz (±0.1dB)

Distortion & Performance (General):
Total Harmonic Distortion (THD): <0.0015% (20Hz - 20kHz, at 1W)
Intermodulation Distortion (IMD): <0.002% (19kHz + 20kHz, SMPTE)
Frequency Response: 20Hz - 20kHz (±0.1dB)
Signal-to-Noise Ratio (S/N): >120dB (A-Weighted, ref. 1W)
Damping Factor: >800 (ref. 8Ω)

Line Input, Pre-Out Section (Typical Performance):
THD (20Hz – 20kHz): <0.0005% at 2V out
Signal-to-Noise Ratio: >110dB (IHF A-weighted, ref. 500 mV out)
Input Sensitivity: 300mV (ref. 500mV out, Volume maximum)
Input Impedance: 47 kΩ
Maximum Input Signal: >10Vrms (ref. 0.1% THD)
Output Impedance: 100 Ω

Phono Input Section (MM, with optional MDC module):
THD (20Hz – 20kHz): <0.03% at 2V out
Signal-to-Noise Ratio: >82dB (MM cartridge, IHF A-weighted, ref. 500mV out)
Input Sensitivity: 2.5mV (with MDC module)
Input Impedance: 47 kΩ, 220pF
Special Feature: Ultra-low-noise MM phono stage with infrasonic filtering circuitry

Line Input, Headphone Out Section:
THD (20Hz – 20kHz): <0.001% at 1V out
Signal-to-Noise Ratio: >110dB (IHF A-weighted, 32Ω loads, ref. 2V out)
Output Impedance: 2.35 Ω (6.35mm), <1 Ω (4.4mm Balanced)
Channel Separation: >75dB at 1kHz

Input Section:
Analog Inputs: 2 × Line Level (RCA, with low-noise buffer amplifiers), 1 × Moving Magnet (MM) Phono (RCA, optional via MDC)
Digital Inputs: 2 × Optical (Toslink), 2 × Coaxial (RCA), 1 × USB Type B (for Computer), 1 × HDMI-eARC
Bluetooth Input: 5.1 with aptX-HD (Two-way), AAC, LDAC, and SBC
Input Sensitivity (Line): 300mV
Input Impedance (Line): 47kΩ
Overload Margin (Line): >30dB

Output Section:
Pre-Out: 1 × Variable (RCA, fully balanced XLR optional via MDC)
Subwoofer Out: 2 × (RCA, independently configurable with adjustable crossover: 40Hz - 200Hz)
Headphone Output: 4.4mm Balanced & 6.35mm (1/4") Jack (on front panel, dedicated Class A headphone amplifier)
Speaker Outputs: 4mm Binding Posts (Speaker A/Speaker B outputs, two pairs)

DAC & Digital Engine:
DAC Type: ESS Sabre ES9028PRO 32-bit HyperStream DAC (Jitter-free 32-bit/384kHz)
Master Clock: Dual ultra-low jitter femtosecond-grade oscillators
Resolution: Up to 32-bit/768kHz PCM, DSD512 (via USB)
Digital Filter: 7 Selectable Filter Types

General Specifications:
Power Supply: Dual-Mono Custom Toroidal Transformer with separate regulation
Power Consumption: <0.5W Standby, 850W maximum
Dimensions (W×H×D): 435mm × 140mm × 400mm (including knobs and feet)
Weight: 16.5 kg
Finish: Brushed Aluminum Front Panel (Silver or Black)
Display: High-Resolution Full-Color IPS LCD Touchscreen

Included Accessories:
IR Remote Control, Power Cable (IEC), USB Cable, Factory Test Report, User Manual

Additional Features:
Dual MDC2 Slots: Two MDC2 ports for expanded functionality (e.g., BluOS-D, Phono, etc.)
Optional MDC2 BluOS-D Module: Adds BluOS multi-room streaming and Dirac Live room correction
NAD Link: For multi-room system control and integration
Trigger Input/Output: 12V DC (3.5mm Jack) for system automation
IR Input/Output: For custom remote control integration
RS-232 Serial Port: For control integration with home automation systems
Certified Integration: Control4, Crestron, RTI, URC, AMX, Savant, Elan certified
Auto Sense: Automatically powers on with signal detection
Tone Controls: Defeatable Bass and Treble controls, Loudness compensation