Pc32 Connections; Word Clock Connection On Apogee Interfaces - Apogee Symphony 32 User Manual

Symphony 32 PCI card – User's Guide

PC32 Connections

It is possible to connect Apogee AD16X, DA16X, Rosetta 800 and Rosetta 200 interfaces to Symphony
PCI cards in a wide array of configurations, for a total of 32 channels of simultaneous input and output per
PCI card. Please consult the Interface Connections Chart on pages 28-31 for a complete list of all the possible
combinations of Apogee interfaces that may be connected per PCI card.
The Interface Connections Chart depicts important aspects of each possible combination, including:
1) The order in which interfaces should be connected. As shown in the example below of an AD16X
and DA16X in Standard routing, the computer should be connected to the AD16X's Main port, and the AD16X's
Thru port connected to the DA16X's Main port.
2) The connection between the interfaces's I/O and the Symphony driver's I/O. As shown in the
example below, the AD16X's 16 analog inputs are connected to Symphony inputs 1-16, and Symphony outputs
1-16 are connected to the DA16X's analog outputs. In this example, Symphony I/O 17-32 are unused, though
they still appear in your software I/O list.
Regardless of the Apogee hardware used, PC 32 cables should be connected as shown below, where the
Symphony PCI card is connected to the first unit's X-Symphony Main port, the first unit's Thru port is connected
to the second unit's Main port, and so on until all interfaces are connected.
INTERFACE SET
AD-16X & DA-16X
From Computer
M
T
M
T
(Symphony PCI card installed in computer)
(X-Symphony Cards installed in Apogee
APOGEE ELECTRONICS
CHANNELS IN USE
1-16 17-32
AD-16X #1
INPUT
DA-16X #1
OUTPUT
converters)
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Symphony 32 PCI card – User's Guide

Word Clock Connection on Apogee Interfaces

In the Symphony system the first interface serves as the clock master to the entire system, and may be set to
Internal or External clock in Apogee's Maestro application. All remaining interfaces must receive a word clock
signal synchronous with the first interface's clock source, whether Internal or External.
When a Symphony system is booted, the first interface will switch to the clock source specified in Maestro
(Internal or External) while the remaining interfaces will switch automatically to their external word clock source.
The two most common ways to accomplish the necessary word clock connections are depicted below.
Using a Master Clock (such as Apogee's Big Ben)
1 Connect a word clock cable between outputs
of the master clock and each interface's word
clock input, and terminate the input with a 75
ohm load.
2 Start your Mac, open the Maestro app, and
set Clock Source Select for the first interface
to External. All remaining interfaces should
switch to their external word clock source.
3 If interfaces aren't displayed in Maestro, select
Tools > Reset Symphony Clocking and click
on External Clock.
4 When opening CoreAudio applications,
ensure that the master clock is running at
the same sample rate as the session you're
opening.
Clocking to the first interface
1 Install BNC "T connectors on the word clock
inputs of the second, third and fourth interfaces
(if present). Connect a word clock cable from
the first interface's word clock output to the
BNC "T" connector on the next interface, from
that interface to the next, until all the word
clock inputs have been chained together, as
shown in figure 2. Terminate the word clock
input of the last interface with a 75 ohm load.
2 Start your Mac, open the Maestro app, and set
Clock Source Select for the first interface to
Internal. All remaining interfaces should switch
to their external word clock source.
3 When opening CoreAudio applications, the first interface should switch to the same sample rate as
the session you're opening, and all remaining interfaces should follow.
APOGEE ELECTRONICS
FIGURE 1
Big Ben
Interface 1
Interface 2
Interface 3
Interface 4
FIGURE 2
Interface 1
Interface 2
Interface 3
Interface 4
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