MOTU Track16 - Desktop Studio FireWire/USB 2.0 Interface - Manual (Page 27)

I N S T A L L I N G T H E T R A C K 1 6 H A R D W A R E
27
Line input trims
The line inputs are calibrated to accommodate
either +4 dB or -10 dB signals and are equipped
with digitally controlled analog trims that provide
-96 dB of cut and +22 dB of gain. You can use either
the main volume knob or the included CueMix FX
software to adjust the input trim. To adjust these
trims using CueMix FX, see “Input trim” on
page 63. To adjust the trims using the volume
knob:
1 Push the corresponding input button.
2 Turn the volume knob.
Use the level meters to observe the current gain.
Main outs and line outs
The stereo quarter-inch main outputs are balanced
line-level outputs that also accept an unbalanced
plug. The line outputs are unbalanced. All four
outputs are calibrated to produce a +4 dBu line
level output signal, according to the EBU-R68
specification, as follows:
In a standard studio configuration, the main outs
are intended for a pair of studio monitors, but they
can also be used as additional outputs for any
purpose.
Optical
The Track16 rear panel provides one set of ADAT
optical (“lightpipe”) connectors (Figure 4-1).
These optical in/out connectors can operate
independently and offer two different optical
formats: ADAT optical or TOSLink (optical
S/PDIF). For example, you could connect
8-channel ADAT optical input from your digital
mixer and stereo TOSLink output to an effects
processor.
Optical trim
The Track16 supplies +12dB of digital trim (boost)
for the optical input, which can be adjusted from
CueMix FX (“Input trim” on page 63).
Optical operation at 44.1 or 48 kHz
When configured for ADAT “lightpipe”, an optical
connector provides 8 channels at 44.1 and 48 kHz.
ADAT optical operation at 88.2 or 96 kHz
When configured for ADAT “lightpipe”, an optical
connector provides four channels at 88.2 or 96 kHz
(2x sample rates) using the industry standard
SMUX high-resolution optical format. If you are
connecting a MOTU interface with optical ports to
the Track16, use the
Type I SMUX setting in the
other MOTU interface. Refer to the documentation
for your other MOTU interface for details on how
to make this setting.
Below is a summary of optical formats:
Choosing a clock source for optical connections
When connecting an optical device, make sure that
its digital audio clock is phase-locked (in sync
with) the Track16. There are two ways to do this:
1. Resolve the optical device to the Track16
2. Resolve the Track16 to the optical device
For 1), choose Internal (or any other clock source
except ADAT optical ) as the clock source for the
Track16 in MOTU Audio Setup.
For 2), choose ADAT Optical as the Track16’s clock
source.
EBU-R68 measurement dBVU dBu dBFS
Meter alignment 0 0 -18
Peak level +8 +8 -10
Headroom 10 dB typical peak to clip
Format 44.1 or 48 kHz 88.2 or 96 kHz
ADAT optical 8 channels 4 channels of SMUX
TOSLink stereo stereo