888/24 I/O
8
Setting Up Your Studio
The following diagram illustrates a typical
studio setup, with the 888/24 I/O con-
nected to a mixing console, effects and
other equipment.
The 888/24 I/O analog audio connectors
are balanced XLRs with pin 2 wired hot
(or “+”), pin 3 cold (or “–”), and pin 1
ground.
If you are connecting a balanced system,
pin 1 and shield should be connected at
the input only (not at the output). This will
prevent ground loops between the shield
and pin 1 conductor.
If you are connecting an unbalanced signal
to the 888/24 I/O inputs or outputs, con-
nect only pin 2 to the “+” signal, and pins
1 and 3 to ground at all inputs only.
Using the 888/24 I/O
Interface as Stand-Alone
Audio Converter
The 888/24 I/O can be used apart from
Pro Tools as a stand-alone 8-channel, 24-
bit, analog-to-digital or digital-to-analog
converter.
Before you use the 888/24 I/O in stand-
alone mode:
1
Turn off the 888/24 I/O.
2
Do not turn on your computer while the
888/24 I/O is in stand-alone mode. If you
do, the 888/24 I/O will stop functioning in
stand-alone mode.
To use the 888/24 I/O as a stand alone A/D
converter:
1
Turn off any digital devices that may
send a word clock signal to the 888/24 I/O
channel 1–2 digital input ports.
2
Turn on the 888/24 I/O. The 888/24 I/O
searches briefly for a word clock signal on
channels 1–2 of its digital input ports.
3
If the 888/24 I/O does not detect word
clock, it functions as a stand-alone A/D
converter using its internal clock. In this
mode you will use analog inputs 1–8 and
AES/EBU outputs 1–8.
✽
The default sample rate of the 888/24 I/O
in stand alone A/D mode is 44.1 kHz.To
change this default setting to 48 kHz, you
must open the 888/24 I/O and manually re-
set it by moving an internal jumper switch. See
“Changing the Default Sample Rate of the
888/24 I/O in A/D Stand-Alone Mode” on
A typical studio configuration
Power Amp
and Speakers
Digital Inputs/Outputs
Channel 1-2
To DAT Recorder
Digital Inputs/Outputs
Channel 3-4
To Digital Effects Devices
DAT Recorder
Instruments
Connected to Console
Analog
Audio
Inputs 5-8
Analog
Audio
Outputs 5-8
Effects Devices
Digital Effects Devices
(set to external sync)
Channel
Outputs 1-4
Tape Returns
or Inputs 1-4
Comp
uter 1
ANALO
G OUTP
UT
ANALO
G INPU
T
AES/EBU
OUTPUT
AES/EB
U INPU
T
S/PD
IF
IN
S/PD
IF
OUT
SLAV
E CLO
CK
IN
SLAV
E CLO
CK
OUT
7
8
5
6
3
4
1
2
7
8
5
6
3
4
1
2
5/6
7/8
1/2
3/4
5/6
7/8
1/2
3/4
