Descrição
35-bit 844kHz DAC and Digital Preamplifier
One of our Masters Series’ finest components to date, the M51 Direct Digital™ DAC uses the same high precision digital processing as our groundbreaking M2Direct Digital Amplifier, but in a new format that easily interfaces with high performance analogue components, including our M22 Stereo Power Amplifier. With features such as extremely low noise, low distortion, wide dynamic range, superb linearity and exceptionally low digital jitter, the M51 will help bring your home theatre system to life. With the ability to accept PCM data rates up to 24 bit/192kHz, the M51 makes it perfect for listening to high resolution downloads, allowing you to hear your favourite songs in the best audio quality possible. Possessing two HDMI inputs and one output with video pass through, the M51 seamlessly becomes the heart of a video 2.0 system, further displaying the M51’s remarkable versatility and innovation.
How Direct Digital™ Operates
NAD’s technology uses a very powerful processing engine that operates at much higher speed and with much greater accuracy than typical DACs. Running at 108MHz, the M51 resamples the incoming pulse code modulated (PCM) signal and converts it to a pulse width modulation (PWM) signal with a sampling rate of 844kHz. Operating in a differential mode with double precision, the M51 has state-of-the-art specifications for low noise and freedom from distortion. The extreme headroom afforded by the 35-bit architecture allows for a DSP-based volume control that does not reduce resolution.
Pure Performance
The incredible precision of the M51’s processing engine gives music a vibrancy and transient accuracy that must be heard to be appreciated. The conversion process from PCM to PWM completely eliminates any jitter present on the incoming signal. Due to the very high clock speed and mathematical precision of our reconstruction filters, the resulting audio signal is totally free of digital artifacts. A Pure Class A analogue stage with very low output impedance provides the perfect interface to your favourite amplifier. Both balanced and single-ended outputs are available.
More than Just a DAC
M51 is a fully functional digital preamp with seven digital inputs and one of the world’s best volume controls. As a ‘preamp’ it is totally noise and distortion free because all switching and volume control is done in the digital domain. There are no analogue circuits except for the Class A buffer at the output of the DAC. While input selection is available from a front panel control, volume can only be selected via remote control. The supplied IR remote also features controls for NAD’s matching M50 Digital Music Player. Serial control is available via RS-232 IR and 12V trigger inputs allow the M51 to fully integrate with advanced automation systems.
The M51 introduces many ‘firsts’ for the DAC product category: first to support HDMI, first to support USB Audio Class 2 with support for 192kHz, the first to use digital error correction, and the first 35-bit architecture to be found in a DAC.
Whether you want to get into computer audio, ‘Home Cinema 2.0’ or just want to upgrade your CD player, the M51 Direct Digital DAC will get the best possible performance from every digital format. All this innovation, performance and flexibility come with NAD’s legendary sound quality and affordability.
Description: Remote-controlled digital-to-analog converter. Digital inputs: AES/EBU (XLR), S/PDIF coaxial & optical, 2 HDMI (stereo only), USB 2.0; all support up to 24-bit/192kHz. Digital output: HDMI. Analog outputs: left & right RCA (unbalanced), left & right XLR (balanced). Output impedance: 47 ohms (unbalanced), 110 ohms (balanced). Output level: 2V RMS. Frequency response: ±0.5dB (ref. 20Hz–96kHz at 192kHz sample rate. Signal/noise: >125dB (ref. 0dBFS 2V out). Channel separation: >115dB (ref. 0dBFS volume –1dB). AC supply: 100–240V, 50–60Hz. Power requirement: 16W.
Dimensions: 17″ (435mm) W by 3″ (78mm) H by 11.5″ (296mm) D. Weight: 12.8 lbs (5.8kg).
