Step 4 - Setting The Sync Source; Using The Usb Input In Master Mode; Using A Master Clock - DCS Scarlatti Upsampler User Manual

dCS Scarlatti Upsampler User Manual

STEP 4 - Setting the Sync Source

The system has been set up to lock to the clock generated by the source, (unless you are using the
input) and the
USB Sync
→
button once, then the
was reset at the start of this procedure, you should see the
This is the simplest arrangement, but it does not give the best sonic performance due to clock jitter.
You can improve the performance by adding a Master Clock to your system.

Using the USB input in Master Mode

Jitter from computer sources is typically very severe and can degrade the audio quality. To avoid this,
the Upsampler's USB interface runs in Asynchonous mode. The Upsampler does not lock to the
source clock, but uses the Upsampler's internal clock instead - this is called Master Mode - and
adjusts the source to the same clock frequency. To use the this mode:
• Connect the Upsampler's
• Use the Upsampler's
• Press the
button, press the
Menu
Settings menu, press the
button as necessary to change the setting to Master:
• Set the Upsampler's
use the DAC's
INPUT
The Upsampler will draw data from the source, but it is not locked to the source, so Sync is NOT
displayed. You can improve the performance by adding a Master Clock to your system.

Using a Master Clock

If you have a Scarlatti Clock (or other dedicated Clock) in your system, lock the source, the Upsampler
and the DAC to the Clock for the best performance. To do this:
• Connect the Clock's
and DAC.
• Set the Clock
Frequency
Upsampler set to output
with the Upsampler set to 24/192, the correct frequency is 48kHz.
• Select the required input on the Upsampler and DAC. This is important because these units store a
different Sync Source
• To set the Upsampler to lock to the Clock, press the
the button to display the
Menu
Source page and then press the
• The Scarlatti Upsampler will display Sync, provided the clock is recognised. If there is no signal at
the Word Clock In connector or it is not recognisable, the Upsampler will sync to audio and display
this icon to warn you:
• The Scarlatti Transport will automatically lock to the Clock and display Sync.
• Set the Scarlatti DAC to sync to Word Clock by pressing the
Filename: Scarlatti Upsampler Manual v1_1x.docx
icon should be displayed. To check this, press the
button again to display the
Menu
interface to a suitable source.
USB
button to select the
INPUT
→
button once, press the
→
button to select the
rate as you wish, connect the appropriate outputs to the DAC and
OUTPUT
button to select that input.
Outputs to the
Word Clock
to suit the source and DAC. For a CD Transport as source with the
or DSD, the correct frequency is 44.1kHz. For a 24/48 source
24/176.4
setting for each input.
Upsampler Settings
button as necessary to change the setting to WClk:
Menu
Page 12
Upsampler Settings
Sync Source –
interface.
USB
button to display the
Menu
Sync Source page and then press the
Inputs on the source, Upsampler
Word Clock
button, press the
Menu
→
menu, press the
button as necessary.
SYNC
Software Issue 1.1x
August 2011
button, press the
Menu
menu. If the Upsampler
Audio icon:
Upsampler
Menu
→
button once, press
button to select the
English version
Sync