User Guide

dCS Delius User Manual Manual for Software Issue 2.3x
dCS Ltd September 2004
Manual filename: Delius Manual v2.3x.doc Page 25 email: [e-mail]
English version web-site: www.dcsltd.co.uk
Dual AES
Dual AESDual AES
Dual AES – Dual AES Mode
The Dual AES interface was developed by dCS to allow 88.2 or 96kS/s data
streams to be recorded on equipment designed for 44.1 or 48kS/s operation. It
allows a stereo pair of 24/96 data to be recorded on a 4-track digital recorder.
Dual AES mode has become a de-facto standard, appearing on an ever
increasing array of products. Since then, we have developed the Dual AES
interface further to operate at up to 192kS/s, doubling the available audio
bandwidth a second time.
All dCS non-optical single-wire interfaces are capable of 24/96 operation, but
some of our audiophile customers have told us there are extra sonic
improvements to be gained from using Dual AES for 24/96 instead. The reason
for this is certainly not obvious – the digits appear to be the same, it is not
related to jitter.
For 24/192 operation there is no choice but Dual AES. Even our high-speed
single wire interfaces are not currently fast enough.
There are certain requirements for successful Dual AES operation. Obviously,
the source must generate a true Dual AES data stream, not two single AES
outputs. The two cables should be similar in length (less than 3m difference).
The two cables must be connected the right way around or the channels will be
swapped.
Changing inputs between single wire and Dual AES may cause the DAC to
default to single AES mode. To avoid this problem, the Dual AES page offers
the following four options:
Off Disables Dual AES mode for when no Dual AES capable
sources are in use.
On Allows Dual AES mode to be manually selected from the
front panel Input button (see page 36) or the Remote
Control, (see page 44).
Auto Delius detects single wire or Dual AES mode from the
message flags in the data stream and sets the mode
accordingly. If a Dual AES source is detected but only
one wire is connected, it will lock to the source as single
AES but flash either the AES1 or AES2 indicator to warn
you that one cable is missing.
Lock If both AES 1 and AES 2 are active, selecting either AES
input in this mode forces the unit into Dual AES mode. If
only one wire is connected, the unit warns you of this by
flashing the indicator for the missing wire. Lock mode is
particularly useful when using an Upsampler –
upsampling everything to 176.4 or 192kS/s Dual AES. In
this case, leave Delius set to Lock mode and select
inputs on the Upsampler.
IMPORTANT! Note that not all Dual AES capable equipment sets the message flags
correctly. If this is the case, do not use Auto mode. You can use it with
confidence on dCS equipment.
do this: To select the Dual AES mode you require, open the Function Menu and step
through until the display shows Dual AES.
do this: Press the
Select button repeatedly and the display will cycle through the
options. When you reach the one you want, wait for the menu to time out.