dCS Vivaldi DAC User Manual Software Issue 2.0x
November 2016
Vivaldi DAC Manual v2_0x Page 33 English version
USB Class
Set to Class 1, the USB interface will operate with Mac PCs running OSX 10.5 onwards
or Windows PCs at sample rates up to 96kS/s.
Set to Class 2, the USB interface will operate with Mac PCs running OSX 10.6 onwards
at sample rates up to 384kS/s. Class 2 operation with Windows PCs requires that the
dCS USB Class 2 Driver 2015 is loaded.
After selecting a different USB Class, wait for 10 seconds while the USB software is re-
loaded.
!
Note that the USB interface will not be detected by the computer if the unit is set to
Class 2 and a suitable driver is not available.
Buffer
Set to On, the digital data is delayed before being presented to the Ring DAC – this is
the usual setting. The delay is 0.72 seconds with 44.1kS/s data, falling to 0.16 seconds
with 192kS/s data. The delay gives the DAC time to detect changes in sample rate or
clock frequency and mute before the change causes audible clicks or other noises.
The extra delay is not a problem with music, but if the DAC is used with television or
video, it may cause the sound to be out of sync with the picture. To reduce the delay,
set the Buffer to Off.
EasyPlay
Set to On, if the Vivaldi DAC is connected to the Transport’s Dual AES output, the action
of loading a disc in the Vivaldi Transport causes the DAC to change input to match the
disc type.
If the disc is an SACD, the Dual AES input connected to the Vivaldi Transport is
selected.
If the disc is a CD, the data stream sourced from the Transport’s PCM outputs is
selected in the order:
1. The upsampled AES or Dual AES data from the Vivaldi Upsampler.
2. The upsampled Dual AES data direct from the Vivaldi Transport.
With EasyPlay set to Off, automatic input selection is disabled.
RS232 Mode
This page sets the RS232 interface to either Text mode for use with 3rd-party control
systems or…
…dCS production Binary mode, which is intended for factory use only.
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