M-Audio ProFire Lightbridge User Manual page 12

Macintosh
Sample Rate Detected
This window displays the incoming sample rate of the sync master source. This is an information-only display–the
incoming sample rate must be changed through your audio software (if the sync source is set to internal), or by
changing the sample rate output of the designated master device (if your sync source is set to any of the external
options).
Note: This window will show "mismatch" if the ProFire Lightbridge detects different sample rates on at least two of
its digital input ports. It is mandatory that all incoming digital audio streams are synchronized for proper operation.
See chapter 11 for more information on word clock synchronization
Adat S/MUX mode
The ADAT format carries eight channels of audio when operating at standard sampling rates of 44.1 or 48kHz, or
four channels when operating at high resolution sampling rates of 88.2 or 96kHz. This high resolution mode is
known as "S/MUX" and is enabled when an ADAT source toggles a special bit in its output stream. This bit tells the
destination device to switch to S/MUX mode in order to receive the high resolution signal correctly.
Unfortunately, some devices do not toggle the S/MUX bit and as a result, the ProFire Lightbridge may be unable to
automatically detect whether the incoming signal is standard resolution or high resolution. The "Auto-Detect" and
"Override" buttons allow you to resolve this issue:
Auto-Detect – This is the default setting and should work in most cases. When this mode is selected, ProFire
Lightbridge observes the S/MUX bit of an incoming signal and automatically switches between standard and
high resolution modes.
Override – This mode forces all of the ADAT ports of the ProFire Lightbridge to operate at high resolution.
You should only select this mode if ProFire Lightbridge is unable to detect a high resolution ADAT input signal
when Auto-Detect is selected.
ProFire Lightbridge User Guide
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