Sound Devices 702T - Manual (Page 19)

702T User Guide and Technical Information
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tion upon input two. Engaging or disengaging phantom power or the high pass filter on input two
causes no effect on input one.
If MS stereo linking is selected for inputs, program sent to tracks and headphones will be L/R stereo pro-
gram. To record discrete M and S signals, do not link for MS, but monitor the MS signal in headphones.
Things to consider when Linking Input 1,2 as MS:
• Digital Inputs cannot be linked as an MS pair.
• If linking Line Inputs as an MS pair, the Setup Menu option LINE INPUT 1,2: GAIN CTRL
must be set to Use Front Panel Knobs.
Digital Input – AES3
The 702T accepts AES3 (AES/EBU) balanced digital at the input 1 XLR connector. Digital input is
two-channel—AES3 signals on XLR-1 appear at inputs 1 and 2. To use the AES3 input, the input
mode-select switch must be set to AES/EBU. There is no level control for AES inputs.
The front panel digital input LEDs illuminate when digital signal is selected as input. If the
LED is flashing, digital input is selected but a no valid digital clock is being received.
Digital Input – AES3id (S/PDIF)
The 702T accepts AES3id and S/PDIF unbalanced digital signals on the BNC connector. The 702T
will auto detect the type of digital signal and adjust accordingly. Like AES3 signals, this is two chan-
nel input. There is no level control for AES3id inputs.
AES3id inputs override analog signals present at the XLR inputs. To use analog sources while using
the AES3id signal as a digital clock source, select analog in the input source menu selection.
When a digital signal is present, the 702T locks its sample rate to its source frequency. This lock is
indicated by a highlighted block on the main LCD display to the right of the bit depth and sample
rate indicators. Recording bit depth is independent of the external digital source.
When locking the 702T to an external digital signal, be certain the source is stable. Loss of digital sig-
nal will cause the 702T to revert to its internally set sample rate, even while recording. The portion
of the file recorded after the loss of signal may not play back properly. Once recording has begun,
unused digital inputs are muted, digital signals that appear on them after the record button has been
pressed will not be recorded or affect the sample rate of the 702T.
The 702T clocks itself to the first digital signal presented to it. If the 702T detects a digital signal on the
BNC inputs and locks to that signal, a digital signal applied to the XLR input will be ignored until the
first digital signal is removed.
Signal Presence and Peak Indicator
The signal presence and peak indicators show audio activity before input-to-track routing. In-
put signal presence LED’s illuminate when a –50 dBFS or greater signal is present. Input signal peak
LEDs illuminate when signal levels reach –3 dBFS or greater.
Input Delay
A digital delay is selectable on each channel of the 702T. Delay time per input is selectable in tenths
of a millisecond (0.1 msec) steps. The Rotary Switch and menu arrows are accelerated. The more you
press or spin, the faster the time setting will increase or decrease. Delay is not set until the Rotary