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An incredibly flexible stand-alone digital-to-analogue converter, the Naim DAC converter has matured in recent years due to the increasing popularity in computer-based audio. With a growing number of digital users wishing to share feeds from computers, online and via MP3 players, DAC’s have more than come into their own.
There are a variety of inputs available for the Naim DAC, including four optical, two coaxial, two BNC and interestingly two USB terminals. With the use of a USB the Naim DAC has the potential to receive digital signals from MP3 players, and other digital devices, controlled with the use of a remote handset.
If exceptional music making is the first hallmark of the Naim DAC, the second is versatility. Versatility comes thanks to S/PDIF inputs that can accommodate either optical or coaxial connections and USB inputs that can accommodate memory sticks and iPod and iPhone models. It arises also from the numerous Naim system upgrades that the DAC makes possible. Simultaneously with its introduction, the CDX2 and CD5 XS CD players have gained S/PDIF outputs and can now benefit significantly from use with the DAC. With the addition of a DAC, existing preamplifiers can be incorporated into digital audio systems. The Naim DAC can be controlled by a Naim preamplifier remote control, seamlessly integrating analogue and digital inputs across the two units. The DAC becomes an extension of the preamplifier. And when a USB stick, iPod or iPhone is docked, the DAC front panel input buttons transform to operate as playback controls
Designing an external digital to analogue converter capable of offering the exceptional musical performance obligatory for a Naim product brings numerous technical challenges. In particular, the S/PDIF interface protocol for digital interconnection has significant jitter and noise problems.
Original solutions to these problems had to be conceived and developed. The Naim DAC has more in common with Naim CD players than with conventional external digital to analogue converters. It overcomes the jitter issues of S/PDIF by reading the data into a "rotating" data RAM buffer independently of its timing signal and reading it out again clocked by one of ten extremely low noise, fixed frequency crystal sine-wave oscillators.
In terms of system topology, the DAC's rotating memory is analogous to a rotating CD feeding raw data to be reclocked. The rate at which the memory fills and empties is controlled by the DAC automatically selecting the oscillator that matches the average incoming clock frequency. The data entering the downstream digital filtering and DAC chips is then completely isolated from the incoming S/PDIF jitter. Along with being a source of jitter, S/PDIF is a potential source of RF noise. The Naim DAC suppresses S/PDIF noise through electrical isolation of its DSP front end from the digital to analogue converter and analogue circuits. Each element is also run from separate power supplies.
The Naim DAC's digital filtering is handled by a powerful SHARC DSP chip running unique Naim authored code to create an ultra high precision 40-bit floating point filter. The filter over-samples by 16 times on 44.1kHz data and provides stop-band attenuation of 180dB on all data. Following the digital filter are the two mono Burr-Brown digital to analogue converter chips, as used in the CD555 CD player. Finally the Naim DAC features a very high performance, low noise, and low distortion fully discrete analogue output stage.
Ground breaking technology and digital audio engineering, however, are purely academic. Listening to the Naim DAC is something else entirely. Startling in its clarity, arresting in its detail, beguiling in its warmth and inspiring in its rhythm, the Naim DAC seduces from the first note.
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