512

Compact Disc Player

MASH Digital to Analogue converter.

Digital Output

DC coupled output

Low output impedance

Separate power regulators for analogue and digital sections

Remote control with direct track access

NAD-Link

Program (21 tracks), Repeat and Random functions

Over the years NAD has built up an enviable reputation for building fine CD players offering outstanding value for money. Developed from the highly acclaimed and award winning NAD Model 502, the latest model, the NAD 512 will further enhance that reputation.

As always, sonic performance is the first priority at NAD. Rather than adding many seldom used features or going for "overkill" on a single aspect of the design, the NAD engineers have concentrated on the design itself to offer the best performance possible at the price. Behind the deceptively modest front panel lies sophisticated circuitry.

Features and Circuitry

Up to 21 tracks can be programmed in any sequence in the NAD's 512 memory, both from the front panel and the supplied remote control. Repeat of the entire disc as well as any pre-selected track or the programmed disc adds to the flexibility. The display incorporates a new "calendar" type, which gives instant information on the number of tracks, time remaining or elapsed, and the track currently being played. The RANDOM function will play the whole disc in random order.

Not all digital outputs are the same. In the case of the NAD 512 careful attention has been paid so that best use can be made of the ever increasing number of products becoming available with digital inputs (DAT, DCC, MD recorders, outboard D to A converters, etc.). The output is buffered and isolated by a transformer from the converter itself and the output impedance has been carefully tailored to produce a precise 75 impedance to ensure perfect matching. With the use of correct cables effects such as reflections, overshoot and spurious signals will be eliminated the from NAD 512's digital output.

With advances in DAC technology coming so rapidly there is a tendency for manufacturers to copy the "application notes" circuitry supplied with the Digital to Analogue converter chips. The end result is a series of CD players of various brands differing only in the number of seldom used features bolted on. This is not the case with NAD CD players.

For the NAD 512 a MASH Digital-to-Analogue single bit converter chip was chosen for its excellent low level linearity. Instead of using a 4-pole filter in the analogue stage as is the norm with almost all other CD players utilising a MASH D to A, a 5 pole filter is used, removing spurious RF interference more effectively and keeping the audio band totally clean. Metal film resistors and polypropylene capacitors are used in key areas to ensure a highly accurate frequency response. Capacitors are not used in the signal path at the output (as this can degrade the sound quality).

The output impedance is very low at 120 , making the NAD 512 less sensitive to cables or the ancillary equipment it is partnered with. The output itself is DC coupled (no capacitors are present in the audio path). Any DC offset is canceled by servo circuitry constantly monitoring the output for any DC offset and re-regulating it back to zero if necessary.

Anyone interested in a high performance CD player without frills should put the NAD 512 at the top of their shortlist.

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NAD 512 manual Compact Disc Player, Features and Circuitry

512 specifications

NAD 512 is a well-regarded audio component in the world of hi-fi enthusiasts, known for its robust design and impressive audio performance. This model represents a noteworthy addition to the NAD lineup, cultivating a dedicated following for its blend of cutting-edge technology and classic audio fidelity.

At its core, NAD 512 is a digital disc player, optimized for handling various formats with precision and clarity. One of its main features is its support for high-resolution audio formats, which allows users to experience their music in fine detail. By utilizing advanced digital signal processing, the NAD 512 can upscale lower-resolution audio files, enhancing the listening experience across diverse media sources.

One of the standout technologies incorporated in the NAD 512 is the implementation of high-quality DACs (Digital-to-Analog Converters). These DACs play a critical role in a player’s ability to reproduce audio signals accurately, converting digital audio files into high-fidelity analog signals. As a result, the NAD 512 maintains a low signal-to-noise ratio, preserving the integrity of the sound and ensuring that every note is delivered with clarity.

The unit is also equipped with extensive connectivity options, catering to an array of modern audio setups. It features both optical and coaxial digital outputs alongside traditional analog outputs. This versatility means that users can easily integrate the NAD 512 into both contemporary and vintage audio systems. Moreover, it supports various input formats, expanding its compatibility with different devices, including computers, gaming consoles, and smartphones.

Another characteristic of the NAD 512 is its intuitive user interface. The front panel is elegantly designed, featuring a straightforward layout that allows users to navigate through different settings and functions with ease. Additionally, the remote control enhances usability, providing a tactile way to enjoy music from a distance.

In terms of build quality, the NAD 512 exudes a sense of durability and reliability. Constructed with premium materials, it is visually pleasing and capable of standing up to the rigors of daily use. The internal components are carefully engineered to minimize resonance and distortion, a testament to NAD's commitment to high-quality audio reproduction.

In summary, the NAD 512 combines advanced audio technologies, robust design, and user-friendly features, making it a preferred choice for audiophiles seeking a dependable digital disc player. With its ability to deliver high-resolution sound and its compatibility with various media formats, it stands as a remarkable asset in any audio system.