User Manual-for Windows

INSTALLING THE AUDIO EXPRESS HARDWARE
22
CONNECT AND SYNC S/PDIF DEVICES
DAT decks and other devices with S/PDIF digital
I/O will sync to the Audio Express via the
S/PDIF connection itself. Just connect it to the
Audio Express via the S/PDIF connectors. When
the device records a digital audio signal (from the
Audio Express), it will simply synchronize to the
clock provided by the digital audio input from the
Audio Express.
When recording digital audio into your host audio
software via the Audio Express’s S/PDIF input, you
can either resolve the external device to the Audio
Express, as described above, or you can resolve the
Audio Express to its S/PDIF input.
Figure 4-5: The setup for synchronizing a S/PDIF device with the
Audio Express. Sync is achieved via the digital I/O connection itself. In
this case, you have to choose S/PDIF as the Audio Express’s clock
source when resolving it to the other device.
POWER OPTIONS
The Audio Express can draw power from two
possible sources:
1. the computer via FireWire, or
2. a DC power supply.
If you use USB2 to connect to your computer, you
must also use the DC power supply included with
your Audio Express, as USB2 does not supply
enough power by itself.
Bus power requirements
The Audio Express draws all the power it needs
from the FireWire bus connection to the computer.
However, the FireWire connection to the computer
must meet all of the requirements discussed below.
6-pin FireWire connectors
The Audio Express can only draw power over the
FireWire bus from a 6-pin to 6-pin cable, or a 6-pin
to 9-pin (FireWire B) cable. It cannot draw power
from a FireWire cable with a 4-pin connector, as
shown below:
Figure 4-6: 4-pin FireWire connectors cannot be used for bus power.
When operating under bus power, daisy-chaining
is not recommended
The Audio Express can be daisy-chained with
other FireWire devices from a single FireWire
connection to the computer. However, if the Audio
Express is operating under bus power, this is not
recommended. If you need to daisy chain the
Audio Express with other devices on the same
FireWire bus, power the Audio Express with the
included power adapter. The other devices on the
chain should also have their own power supply. In
general, bus-powered FireWire devices should not
be daisy-chained.
FireWire adapter products must be powered
If you are using a FireWire adapter (a third-party
product that supplies one or more FireWire ports
to your computer), it must have direct access to a
power supply:
■
PCI FireWire cards
— If you plan to connect the
Audio Express to a PCI card and run the Audio
Express under bus power, the PCI card must have a
S/PDIF
S/PDIF device
Audio Express
Audio Express
Clock Source setting =
Internal (when resolving the other
device to the Audio Express)
Audio Express
Clock Source setting =
S/PDIF (when resolving the Audio
Express to the other device)
S/PDIF
6-pin FireWire
4-pin FireWire
✓
✗
YES
NO