In a related review, John Atkinson spends some serious time with NAD's "Masters Series" combination of M50 Digital Music Player, M51 D/A processor, and M52 RAID array Media Store. Yes, this exquisitely engineered system sounded…

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Woo hoo!!!!
But the only living thing in this pack of once-proud beasts was the young man sitting at the kitchen table, slowly pecking at the keys of a rundown Bondwell laptop and blowing soap bubbles out of the antique ivory…
For instance, Lew Lipnick found the gap between the 855 and the original Theta DS…
Beginning with the multi-bit Rotel, the frequency response (fig.1) was virtually flat across the audible range, with only a small amount of ripple in the upper octaves—ripples characteristic of machines using Philips digital filters. The 1kHz squarewave in fig.2 is also typical of players using linear-phase digital filters, and although pre-emphasized CDs are in the distinct minority, the virtually flat de-emphasis response (not shown) guarantees that they will be properly balanced in playback.
Fig.1 Rotel RCD-955AX, frequency…
As in the RCD-955AX, the 1-bit Rotel had a rather typical Philips-chipset frequency response, with a trace more HF ripple than in the multi-bit player (fig.9). The ripple in both machines should be audibly insignificant, however, and the relative frequency responses of the two Rotels do not—at least in spectral terms—explain CG's relative reactions to the two players. The squarewave in fig.10 is a near-clone of that from the multi-bit Rotel, including the obvious presence (from the shape of the "ripple" on the horizontal portions of the waveform) of a…
Rotel RCD-955AX: 16-bit CD player. Output voltage: 2V RMS. Output impedance: 200 ohms.
Dimensions: 17.3" (440mm) W by 3.6" (92mm) H by 12.5" (316mm) D. Weight: 5.8kg.
Price: $449 (1992); no longer available (2014).
Rotel RCD-965BX: 1-bit CD player. Output voltage: 2V RMS. Output impedance: 200 ohms.
Dimensions: 17.3" (440mm) W by 3.6" (92mm) H by 12.5" (316mm) D. Weight: 5.8kg.
Price: $549 (1992); no longer available (2014).
Both: Approximate number of dealers: 200 (1992).
US distributor: Rotel of America, 54 Concord Street,…
A section of this biography, which documents the early life of the dazzling bebop saxophonist Charlie Parker, starts with a four-page meditation on "the truth and myth of railroads" in America: the figurative underground railroad that comprised a web of escape routes for slaves fleeing the South; the "black-smoke-puffing iron horse" that galloped into the West and "would eventually carry the brutal and legendary Apache chief Geronimo and his people . . . to…
I've been using NAD's Masters Series M51 Direct Digital D/A processor ($1999) as one of my references since summer 2013. Jon Iverson had enthused about the M51 in his July 2012 review, concluding that he preferred DACs "that reveal as much as possible about what was captured on the tape or in the digits, and couldn't care less about adding a rose-colored tint to dodgy digital sound. In this regard, the NAD M51 succeeds with a wonderfully detailed and revealing sound best described as honest, with a friendly smile." My own…