Installation guide

Chapter 4: Connecting Your Studio 25
8 Replace the four front panel screws using the
hex wrench.
9 Replace the top screws with a Phillips screw-
driver.
Making Signal Connections to
the 888/24 I/O
Depending on how you plan to use the
888/24 I/O, the way you connect it to your stu-
dio will vary.
Choosing between +4 dBu and
–10 dBV operation modes
The 888/24 I/O can be set to operate at +4 dBu
or –10 dBV input and output levels (see “Chang-
ing Operating Levels of Individual 888/24 I/O
Channels” on page 23). It is important that you
determine which line level mode is appropriate
for your studio. In +4 dBu operating mode, the
888/24 I/O is a 24-bit digital audio device capa-
ble of producing audio signals at or near
+26 dBu. Check the owner’s manual for your
mixer, power amplifier or effects processor to see
if it can handle this load. If it cannot, consider
setting the 888/24 I/O to operate at –10 dBV
line levels.
Consider the following when connecting a
mixer:
◆ If your mixer cannot handle more than 1.5 V
(RMS) inputs at +4 dBu, then you should set the
888/24 I/O to run at –10 dBV line level.
◆ If your mixer can handle up to 8.5 V (RMS) in-
puts, or has pads or attenuators on its inputs,
then you can use the +4 dBu setting on the
888/24 I/O.
Most manuals contain device input specifica-
tions, including whether or not there are pads or
attenuators. Consult the manufacturer of your
mixer or power amplifier for further informa-
tion.
Setting Up Your Studio
The following diagram illustrates a typical stu-
dio setup, with the 888/24 I/O connected to a
mixing console, effects and other equipment.
The 888/24 I/O analog audio connectors are bal-
anced 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 con-
ductor.
If you are connecting an unbalanced signal to
the 888/24 I/O inputs or outputs, connect only
pin 2 to the “+” signal, and pins 1 and 3 to
ground at all inputs only.
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
Computer 1
ANALOG OUTPUT
ANALOG INPUT AES/EBU OUTPUT AES/EBU INPUT
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TDM_Install.book Page 25 Saturday, January 13, 2001 9:35 PM