Even with upsampling, the Link II's linearity was superb, as shown in fig.4. Any level error remains below 1dB down to -115dBFS, with noise then revealing its presence as an increase in positive error. As a result, the unit's reproduction of an undithered 1kHz sinewave at -90.31dBFS (fig.5) was excellent, if not quite to the standard achieved by the Marantz SACD player
. Increasing the word depth to 24 bits gave a waveform more closely resembling a sinewave (fig.6), though now some DC offset, or perhaps very-low-frequency noise, makes an appearance.
Fig.4 MSB Link III, departure from linearity, 16-bit data (2dB/vertical div., right channel dashed).
Fig.5 MSB Link III, waveform of undithered 1kHz sinewave at -90.31dBFS, 16-bit data.
Fig.6 MSB Link III, waveform of undithered 1kHz sinewave at -90.31dBFS, 24-bit data.