M66 vs Hegel H390
The H390's signal-to-noise is 100 dB against the M66's 105 dB and its thd 0.005% against 0.001%. Both share bit depth (32-bit) and max sample rate (384 kHz).
AI-generated product photo — not official manufacturer imagery.
The NAD M66 is a revolutionary high-fidelity streaming DAC and preamplifier that combines audiophile-grade digital-to-analog conversion with advanced multi-room streaming capabilities. It features a 7-inch touchscreen for intuitive control and supports over 20 streaming services including Amazon Music HD, Apple Music (AirPlay 2), Spotify Connect, Tidal Connect, and Qobuz. The M66 incorporates Dirac Live Room Correction and Dirac Live Bass Control for precise acoustic optimization, including seamless integration of up to four subwoofers with independent calibration. It uses flagship ESS Sabre ES9038PRO DAC and ES9822PRO ADC chips, and introduces NAD's Dynamic Digital Headroom (DDH) technology to eliminate digital inter-sample peak clipping distortion, enhancing the realism of percussion and cymbals. The unit offers a wide range of inputs including HDMI eARC, balanced XLR, RCA, optical, coaxial, AES/EBU digital inputs, and an ultra-quiet MM/MC phono stage with RIAA equalization. It supports both wired Ethernet and Wi-Fi (802.11ac) networking, Bluetooth 5.0 with aptX-HD and LDAC, and is Roon Ready. The M66 also features a high-precision resistor-ladder volume control circuit for minimal distortion and accurate channel matching, plus two MDC2 expansion slots for future upgrades. Its elegant aluminum chassis and comprehensive control options including Amazon Alexa and Apple Siri voice control make it a versatile and future-proof centerpiece for any high-end audio system.
DAC capabilities and digital audio processing
Analog signal output specifications
Phono stage specifications
Input and output connections
Supported streaming platforms and protocols
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Estimated price (community-sourced)
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Components that show up alongside the M66 in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The H390's signal-to-noise is 100 dB against the M66's 105 dB and its thd 0.005% against 0.001%. Both share bit depth (32-bit) and max sample rate (384 kHz).
The DAC501's signal-to-noise is 128 dB against the M66's 105 dB and its thd 0.000% against 0.001%. Both share bit depth (32-bit) and max sample rate (384 kHz).
The UD-701N's signal-to-noise is 110 dB against the M66's 105 dB and its thd 0.002% against 0.001%. Both share bit depth (32-bit) and max sample rate (384 kHz).
The D50's bit depth is 24-bit against the M66's 32-bit, its signal-to-noise 100 dB against 105 dB, and its thd 0.000% against 0.001%. Both share max sample rate (384 kHz).
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