dCS Rossini Transport/DAC v2 SACD Transport/DAC Lab Report

Lab Report

Comparisons with the fully integrated Vivaldi One [HFN Feb '18] reveal this two-box, and slightly more affordable, solution to be very, very close indeed in performance. For example the 6V analogue output option still has a fabulously low, cable-agnostic 760mohm source impedance (560ohm for the One) and offers a variable output up to 5.88V. The A-wtd S/N ratio is some 4dB lower than the One's at 113dB, however, and low-level resolution good to ±0.1dB at –100dBFs (and ±1.2dB to –120dBFs). Distortion is fractionally higher, but still vanishingly low: down to 0.00002% at –10dBFs and no higher than 0.0002% over the top 30dB of its dynamic range through bass and midrange. At 20kHz distortion falls between 0.00015-0.0004% over the top 30dBFs [see Graph 1, below, and note the Y scale now extended down to –140dBFs from –120dBFs].

The Rossini combination does improve on the Vivaldi One with respect to digital jitter at <30psec vs. <50psec with DSD64 and at all LPCM sample rates. Uncorrelated, noise-like, jitter is also reduced in the latest Rossini DAC. The Rossini's underlying code may run on a single FPGA, rather than a pair, but it is essentially unchanged, so frequency responses still depend on your choice of digital filter. Filters 1-4 and 6 are linear phase types delivering a ruler-flat ±0.02dB response (20Hz-20kHz) with CD, albeit with variable stopband attenuation (125dB, 35dB, 12dB, 6.1dB and 120dB respectively). Filter 5 is a minimum phase type with a –0.5dB/20kHz response and 125dB stopband rejection. Filters 5 and 6 are not available to 48kHz/96kHz files but reappear with 192kHz data – the responses with Filters 1-6 reaching out to –3dB points of 78kHz, 80kHz, 48kHz, 58kHz, 28kHz and 48kHz, respectively [see Graph 2, below]. PM


Distortion vs. digital signal level over a 120dB range (1kHz/24-bit, red; 1kHz/CD, black; 20kHz, blue)


Frequency responses with 192kHz data (Filter 1, black; 2, red; 3, cyan; 4, green; 5, grey; Filter 6, orange)

Maximum output level / Impedance 5.88Vrms / 760mohm (XLR)
A-wtd S/N ratio (LPCM / DSD) 113.1dB / 112.9dB
Distortion (1kHz, 0dBFs/–30dBFs) 0.00007% / 0.00018%
Distortion & Noise (20kHz, 0dBFs/–30dBFs) 0.00028% / 0.00042%
Freq. resp. (20Hz-20kHz/45kHz/90kHz) +0.0 to –0.0dB/–0.dB/–dB
Digital jitter (48kHz/96kHz / DSD) 15psec / 10psec / 30psec
Resolution @ –100dB/–120dB ±0.1dB / ±1.2dB
Power consumption (Transport/DAC) 15W/21W (14W/20W standby)
Dimensions (WHD) / Weight (Transport) 444x125x435mm / 15.6kg
Prices £16,500 (Transport)/£17,089 (DAC)
Data Conversion Systems Ltd
Supplied by: dCS Ltd
01954 233950