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dCS DACs oversample in several stages, eventually presenting the Ring DAC(TM) with 5-bit binary data at about 3MS/s. The Mapper decodes the data to a minimum of 32 digital signals, one corresponding to each binary state, then it scrambles the order of the signals. The Mapper randomises small matching errors in the Ring DAC core, converting what would be harmonic distortion to a small amount of extra noise.
Vivaldi DAC v2.00 offers a choice of 3 Mappers – the original 3MS/s design and two new Mapper algorithms that run at about 6MS/s.
DSD/128 is currently supported by the dCS Rossini Player & DAC (via Network, USB or Dual AES) and the Vivaldi DAC v2.00 onwards (via USB or Dual AES).
You will need a PC with a CD drive (it can be external), loaded with ripping software such as dBPowerAmp Ripper or JRiver Media Center. Run the ripping software and set the location of your music library (which can be a networked drive). Load the disc, wait while it is read. You may need to help the software identify the disc so that the metadata or artwork is picked up correctly. Select “Rip disc” and wait until the process is complete. If necessary, edit the tags and find the album art on the internet. Eject the disc. Job done!
The Rossini Clock’s front panel is deliberately simpler than our other Master Clocks, so there is limited scope for adding more features. At the time of writing, the current Clock software is v1.00 and this might not change. If new software becomes available (please check the Software History section), the update can be loaded by your dealer via the RS232 interface.
The Rossini Player and DAC are intended to be updated over the internet via the Network interface. Open the Rossini app, tap “Configure” for the device you want to update, then “Information > Version” and “Check for Updates”. Follow the instructions on screen.
For users who do not have internet access, the Main Software can be updated from a disc or file (please contact your distributor), but this does not update the Network firmware. Please see the update instructions for more information.
The Rossini Player in CD mode is compatible with Vivaldi, Scarlatti & Paganini Master Clocks, however it will only lock to word clock at 44.1kHz to match the CD sample rate. At other clock frequencies, the Master icon is displayed. The Player’s other inputs will of course lock to compatible word clock frequencies in the range 44.1-192kHz.
The Rossini Player reads RedBook CDs or the CD layer of hybrid discs only. We could not find an CD/SACD mechanism of sufficient quality to use in the Rossini Player.
It is possible to use the Rossini Clock with a Vivaldi DAC and Transport, or (in a limited way) a Vivaldi Upsampler and DAC. The Rossini Clock does not have enough outputs to synchronise 3 units.
The Rossini Player or DAC is designed to accept DSD data from SACDs played on a Vivaldi Transport, Scarlatti Transport (v1.11) or Paganini Transport (v1.11) via the Dual AES interface.
If the the system is set to lock to the Master Clock set to 176.4kHz, you will find that the Scarlatti Transport is not displaying “Sync” because it cannot lock to 176.4kHz word clock. Set the Master Clock Group driving the Transport (v1.11) to 44.1 or 88.2kHz .
The Vivaldi Transport will lock to 176.4kHz word clock.
This feature is for use with Vivaldi DAC v1.10 and Vivaldi Upsampler v1.10 onwards. Many computer audio libraries contain files at several different sample rates. Changing rates sometimes causes locking problems when the DAC is set to standard Master Mode. To avoid this, we have added Universal Master Mode – this sets the DAC’s Word Clock Output to generate 38.4kHz always. The Upsampler can lock both its crystal oscillators to this frequency, simplifying the locking sequence. If you have a Vivaldi Master Clock, use this instead – it gives better sonic performance. Our other products are not compatible with this feature at the time of writing.
The Vivaldi DAC and Vivaldi Upsampler loaded with software v1.10 onwards will accept 24/352.8 or 24/384 data via USB. For Windows PCs, the dCS USB Driver 2014 must be installed. Older products will not accept data at these rates directly over USB, so the streaming program should be set to down-sample to 192kS/s maximum.
Software version 1.10 onwards temporarily disables any inputs that are not connected and driven with digital data. This makes it easier to find the inputs you are actually using. Once you connect an input to an active source, you will be able to select it. (The Upsampler’s USB2, iPod and Network inputs do not have this feature.)
No. We have looked into this possibility before, but each time the practical problems of supplying such a kit world-wide prove insoluble. Please ask your dealer for cable recommendations.
JRiver for Mac appears to use the maximum word-length setting in the OSX CoreAudio system. Open the Audio MIDI Setup page and set the Output Format for the dCS device to “2ch – 24bit Integer” to correct this.
Hold down the Sleep button for about 2 seconds to set a dCS unit or a full stack to Sleep mode, then press the OFF button briefly if you want to switch off completely. This helps to prevent the system being set to Sleep mode or turned off by accident.
The most common cause of this is inserting the batteries the wrong way around. Press the flat (negative) end of each battery against the spiral spring and push the battery into the holder. You will find a picture of the correct battery orientation in the manual.
Rubidium Clocks are typically accurate to 0.1 parts per billion in the medium term (about 1000 times more accurate than a dCS Master Clock) but they generate some short-term jitter due to the way they operate. Our opinion is that stability (i.e. low jitter) is much more important than extreme accuracy, so we have steered our Master Clock development in that direction.
You can improve the accuracy of the timing in your system by slaving dCS Master Clocks (Vivaldi, Scarlatti, Paganini Plus) to the 10MHz output from a Rubidium reference generator.
To do this, connect the 10MHz output to the Master Clock’s Reference Input and set the Coupling menu page to AC. The Master Clock will take a few seconds to lock and then will display the “locked” icon.
Listening tests have shown that a dCS Master Clock is very effective at reducing atomic clock jitter and the combination gives improved sonic performance.
The short answer is you cannot and you would not like the result if you could!
The dCS Ring DAC (TM) is an oversampling design, filtering is necessary to remove aliases produced by the oversampling process and Nyquist images produced by the conversion to analogue. These artefacts appear as mirror images of the audio band at higher frequencies, they cause unpleasant intermodulation effects if they are not removed. The digital conversion in the Upsampler generates aliases also, so these must be filtered out for the same reason.