Accuphase DP-75V CD player Measurements part 2
The linearity error with 16-bit data (fig.4) was negligible down to below -100dBFS, which is among the best we have measured. As a result of this superb linearity and the very low noise floor, the DP-75V's reproduction of an undithered 1kHz tone at -90.31dBFS (fig.5) was essentially perfect---the three discrete voltage steps can be clearly perceived. Increasing the word length to 24 bits gave a reasonable facsimile of a sinewave (fig.6).
Fig.4 Accuphase DP-75V, departure from linearity, 16-bit data (2dB/vertical div., right channel dashed).
Fig.5 Accuphase DP-75V, waveform of undithered 1kHz sinewave at -90.31dBFS, 16-bit data.
Fig.6 Accuphase DP-75V, waveform of undithered 1kHz sinewave at -90.31dBFS, 24-bit data.