Avid HD OMNI Preamp, I/O, and Monitoring Pro Tools HD Series Interface - Manual (Page 55)

Chapter 5: SETUP Mode 51
Sample Rate Conversion
(SRC1–2)
In SETUP mode, the Sample Rate Conversion
(SRC1–2) control lets you enable (or disable)
Sample Rate Conversion for the selected Digital
1–2 Input Source.
At sample rates of 176.4 kHz and 192 kHz, Sam-
ple Rate Conversion is automatically enabled if
the Digital 1–2 Input Format is set to Optical
(S/PDIF) .
To enable (or disable) Sample Rate conversion for
the selected Digital 1–2 Input Source:
1 Enter SETUP mode. The SETUP LED lights
green.
2 Turn the MONITOR encoder until the display
shows “SRC1–2.”
3 Press the MONITOR encoder button to select
SRC1–2. The SETUP LED blinks on and off.
4 Turn MONITOR encoder until the display
shows ON (or OFF).
5 Press the MONITOR encoder button to enable
(or disable) Sample Rate Conversion for the cur-
rently selected Digital 1–2 Input Source.
6 Press SETUP button to exit SRC1–2 and return
to top level of SETUP Options menu. The SETUP
LED stops blinking and lights solid green.
7 Exit SETUP mode.
SPL Display Calibration
(SPLCAL)
In SETUP mode, the SPL Display Calibration
(SPLCAL) control lets you change the Monitor
display to read in SPL (Sound Pressure Level) in-
stead of the factory default dB values. Calibrat-
ing for SPL requires an SPL meter and is com-
mon in post-production environments where
monitoring standards are commonly observed
for greater portability, repeatability, and predict-
ability of mixed material.
HD OMNI lets you adjust the SPL Display Cali-
bration both for the MAIN and ALT Monitor
Paths.
The Digital 1–2 Input Source control is un-
available in SETUP mode when the Hard-
ware Setup dialog is open.
To properly calibrate the analog speaker
outputs, you will need to first use OUTRIM
mode and an SPL meter. After each speaker
output has been properly trimmed and cali-
brated to an SPL value, use the SPL Display
Calibration to set the SPL value to match
the level that was calibrated in OUTRIM
mode. For more information, see
Appendix B, “Sound Pressure Level Display
Calibration.”