dCS Puccini U-Clock
User Manual
Software Issue 1.0x
October 2008
Filename: Puccini U-Clock Manual v1_0x.doc
Page 6
English version
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This section guides you through setting up the unit for basic operation.
Preliminaries
For digital interfaces, use with cables designed for digital audio:
•
for Word Clock interfaces, use 75
Ω
coax cables fitted with BNC plugs.
•
for SPDIF RCA interfaces, use 75
Ω
coax cables fitted with RCA Phono plugs.
•
for the USB interface, use a screened USB type B cable.
Connect the power cable supplied to the power inlet on the rear panel, plug the other end into a
convenient power outlet. Set the rear panel switch on (the “
I
” position).
!
Please do not use an excessively heavy or inflexible power cable as this may damage
the power inlet connector.
The GOLDEN RULES for using a System Clock
•
The source equipment MUST be locked to the System Clock.
If it is not, you will either have locking difficulties or hear occasional clicks and the advantages of
using the Clock will be lost.
Most non-
dCS
CD transports, DAB radios and other equipment do not have a Word Clock Input and
so CANNOT be locked to a Master Clock. If you are using such equipment, make sure the DAC is
set to slave to the audio input, not to the system clock.
•
The clock frequency MUST match the sample rate(s) used in the system.
If it does not, the system cannot lock and the DAC may remain muted. Please check the manuals
for the equipment used in your system.
When the
Puccini U-Clock
is set to 44.1kHz, it may be used with DSD-based systems, CD systems
without an upsampler running at 44.1kS/s or CD systems upsampling to 88.2kS/s or 176.4kS/s
Dual AES.
When the
Puccini U-Clock
is set to 48kHz, it may be used with a DVD player or DAT recorder fitted
with a Word Clock Input running at 48kS/s, or upsampling to 96kS/s Dual AES or 192kS/s Dual
AES.
The
Scarlatti Upsampler
is an exception to this rule – we have designed a very flexible clocking
arrangement for the
Upsampler
to make it easier to use. It will lock to Word Clock at 32, 44.1, 48,
88.2 or 96kHz, regardless of the input and output sample rates.
To make best use of the
Puccini U-Clock,
all the digital audio units in the chain should be locked to it.
