Chapter 5: Hardware Overview 33
Word Clock
The Word Clock In and Out ports let you con-
nect BNC cables to synchronize Pro Tools to in-
coming 1x Word clock, and synchronize other
devices to Pro Tools-generated Word clock.
Line Outputs (1–4)
These outputs let you send discrete Pro Tools
outputs to external headphone or cue systems,
remote speakers and similar devices. Line out-
puts 1–4 accept balanced TRS, or unbalanced TS,
1/4-inch cables.
Line Out (5–6)
This connector accepts a 1/4-inch cable, to sup-
ply two channels of unbalanced output to an ad-
ditional analog device. (Line Out 5 = Tip;
Line Out 6 = Ring.)
Footswitch
The footswitch connector on Mbox 2 Pro lets
you use a footswitch pedal to control either
playback start/stop or recording punch in/out.
Both QuickPunch audio punch-in and punch-
out and MIDI punch-in and punch-out record-
ing are supported.
The footswitch connector is designed specifi-
cally for instantaneous (momentary) on/off
pedals with a 1/4-inch TS connector. Continu-
ous on/continuous off pedals can also be used,
but may result in unexpected behavior.
S/PDIF Digital I/O
The S/PDIF in and out ports are unbalanced two-
conductor phono (RCA) connectors that utilize
a full 24-bit, two-channel digital data stream.
The Sony/Phillips Digital Interface Format
(S/PDIF) is used in many professional and con-
sumer CD recorders and DAT recorders. To
avoid RF interference, use 75-ohm coaxial cable
for S/PDIF transfers and keep the cable length to
a maximum of 10 meters.
In use, the S/PDIF input channels are available
in addition to the four channels of analog audio
input when S/PDIF is selected as the Pro Tools
Clock Source. This lets Mbox 2 Pro be used as a
6-in/8-out digital audio interface for
Pro Tools LE.
The S/PDIF output channels are always avail-
able, in all clock modes.
Mon Out (Monitor Output)
These outputs support balanced TRS, or unbal-
anced TS, 1/4-inch connections. To monitor
your mix, these outputs can be connected to a
mixing board, directly to a monitoring system
such as a stereo power amp, or another stereo
destination.
The Mon Out Left and Right play the audio that
is routed to analog outputs 1 and 2 from within
Pro Tools, respectively. These analog outputs
feature 24-bit digital-to-analog converters.
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