M-Audio ProFire Lightbridge User Guide
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6
Controls and Connectors
6
Front Panel
1.
Headphone Output
– Accepts a standard 1/4” stereo headphone connector. This output always mirrors
the analog line output. The headphone level is independent of the line output level, and is controlled by
the headphone level knob (2).
2.
Headphone Level
– Controls the volume level of the Headphone Output jack (1).
3.
Output Level
– Controls the output level of the rear panel analog Line Outputs (16).
4.
Sample Rate Indicator LEDs
– These LEDs display the sample rate of the current digital input signal,
showing 44.1kHz or 48kHz. When the Sample Rate Multiplier LED (5) is lit, the sample rate indicated by
these LEDs is doubled to 88.2kHz or 96kHz.
5.
Sample Rate Multiplier LED
– This LED is used in conjunction with the Sample Rate Indicator LEDs
(4) to display the sample rate of the current digital input signal. When the Sample Rate Multiplier LED is
lit, the sample rate shown by the Sample Rate Indicator LEDs (4) is doubled.
6.
Sync Source LEDs
– These LEDs light to indicate the master word clock synchronization source. The
available sources are: internal word clock, external word clock via BNC input, optical input, or S/PDIF
input. The associated LED will light steadily if the interface is receiving a valid clock signal, or it will flash
if the interface is receiving a faulty signal.
7.
MIDI Indicator LEDs
– These LEDs light to indicate activity at the MIDI input and output ports.
8.
Optical I/O Activity Indicator LEDs
– When lit, these LEDs indicate the presence of a valid digital
audio signal at the associated input or output.
9.
Power LED
– This LED illuminates when the unit is powered on.
10.
Power Switch
– Turns ProFire Lightbridge on and off.
