Sound Devices 664 - Manual (Page 26)

PFL (Channel Solo Monitor)
Slide the PFL switch left to activate, and again to deactivate. For momen-
tary action, hold the switch left for one second or longer.
PFL stands for “Pre-Fade Listen”. When any input’s PFL is activated, the
currently selected Monitor Source is replaced with the PFL mix program.
The PFL mix program is a mono mix of the pre-fade level of all inputs
with PFL enabled. PFL monitoring only affects the headphone monitor, it
does not affect audio sent to the outputs.
The selected input’s Activity LED flashes yellow when the input’s PFL is
engaged. When one input PFL is engaged, that input’s name will appear
in the lower right corner of the Main Screen. When multiple input PFL’s
are engaged, PFL MULT will appear in the lower right corner of the Main
Screen.
PFL Mode
By default, PFL signal to the headphones is pre-fader. This behavior can be altered so that PFL
signal follows the pre- or post-fader setting of the selected input. When Setup Menu option
INPUTS > PFL Mode is set to Follow ISOs, PFL signal will be pre-fader if the input is routed to its
track pre-fader and PFL signal will be post-fader if the input is routed to its ISO track post-fader.
RTN and COMM Monitoring
RTN A, RTN B, RTN C, and COM RTN inputs can be monitored quickly using the RTN Switch.
Primary Monitor Sources are monitored by sliding the RTN Switch left or right while Alternate
Monitor Sources are monitored by holding the Select Encoder then sliding the RTN Switch left or
right. The Primary and Alternate Monitor Sources can be changed from the Setup Menu options
COMMS/RETURNS > RTN Toggle Left and COMMS/RETURNS > RTN Toggle Right. To return to the
previous monitor selection, Slide the RTN Switch in the same direction of the active RTN.
RTN A, RTN B, and RTN C input levels can be metered and adjusted from the Main Screen. To adjust
the gain of a RTN input:
1. Press the Meters button until a Meter View which displays the RTN’s is visible. see Meter
Views
2. Turn the Select Encoder to highlight the RTN to be adjusted.
3. Press the Select Encoder to access gain adjustment mode for the selected RTN. The back-
ground color of the RTN label will become orange, and the input gain value (in dB) will ap-
pear in the lower right corner of the LCD.
4. Turn the Select Encoder to adjust the gain. RTN gain adjustment mode will exit automatically
after 3 seconds.
664 User Guide and Technical Information
v. 2.02 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
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Headphone Monit
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