Operating instructions

23
Controls
The front panel contains most of the user adjustable controls and indicators for the 2192. The only
controls located on the rear panel are the analog input and output line level trim controls (see
Analog Line Trims on page 19).
Important: Do not change any front panel knob or switch settings while audio conversion
or transcoding is in process. The signal is briefly interrupted when new settings are
applied.
LED Level Meters
Level metering for each of the stereo input and output channels is provided by its own 10-segment
LED display. Each channel has timed peak/hold digital clip/maximum output indicators.
All LED segments except CLIP are driven by the analog metering circuitry (the meters are tied to
the converters, not the analog trims). The red CLIP indicators are driven by the digital circuitry.
Analog Metering
The nine analog LED segments are calibrated to reflect digital signal levels. A value of 0dB on the
analog meter is equal to digital full scale code (0dBFS), which reflects an analog signal level of
+22dB (adjustable using the rear panel Analog Line Trims for each channel).
An analog signal level of +4dBu at 1kHz will illuminate the –18dB segment on the 2192 meters.
Please note that frequencies below 50Hz will flicker, and may not be reported correctly.
Digital Clip Indicators
When the red CLIP indicator illuminates, a full-scale digital signal has occurred.
CLIP uses a timed peak/hold-style indicator. When a signal at or over 0dBFS occurs, the CLIP
indicator will remain illuminated momentarily before being auto reset once the signal drops below
0dBFS.
Input Level Meters
This pair of LED level meters indicates the signal strength at the stereo analog inputs relative to the
calibrated 0dBFS level.
Output Level Meters
This pair of LED level meters indicates the signal strength at the stereo analog outputs relative to
the calibrated 0dBFS level. See also Output Level Meter Calibration on page 20.
Clock Source
The Clock knob specifies the 2192 master clock source. Note that the clock source can be
independent of the signal used for digital to analog conversions. For example, you could select
AES/SPDIF as the clock source but perform D/A conversion on the incoming ADAT optical signal
by setting the Digital Outputs Source (page 27) to ADAT.
The 2192 can be used for word clock distribution by connecting multiple clock sources to
the rear panel, then using the Clock knob to switch between them.