LAB REPORT: dCS DEBUSSY(￡7499)

摘要

USB DACs have clearly come of age if the dCS Debussy is any guide. For all practical purposes, it processes 24-bit data at 48kHz and 96kHz no less transparently than the same information carried as LPCM over the S/PDIF interface. Differences are microscopic. Distortion at the peak (balanced) 6V output amounts to 0.0003% via USB and 0.00027% via S/PDIF at 1 kHz and 0.0011%/0.0009%, respectively, at 20kHz. The responses are the same - ostensibly ruler flat to within ±0.03dB over 20Hz-20kHz with 44.1kHz/48kHz inputs and -0.2dB/40kHz to -21.9dB/45kHz with 96kHz inputs. Higher 192kHz rates were not supported on this sample. Incidentally, dCS's 'filter' option extends its response with 24-bit/96kHz data out to -0.77dB/45kHz, trading a slightly poorer alias rejection for a superior transient performance.