Sound Devices 664 - Manual (Page 23)

Peak Hold
When Peak Metering is enabled (Peak Only or Peak + VU), peak hold displays the last high-
est peak value on the meter as a separate, individual meter segment. By default this meter
segment will remain visible for 1 second. This time can be adjusted from Setup Menu option
SYSTEM > Meter Peak Hold Time to 1, 2, 3, 4, or 5 seconds. The Infinity option will display the last
highest peak indefinitely until a higher peak is reached. The Off option will disable peak hold.
Input Activity LED
Each Input has its own Input Activity LED located just above the Input Fader.
The LED illuminates in various colors and intensities to represent the signal
level appearing at its respective input. Green = pre-fade signal activity, yellow
= pre- and post-fader limiter activity, red = pre- and post-fader signal overload
(peaking). Reduce the trim level control if the LEDs continuously illuminate
yellow or red. The Input Activity LED will flash yellow when the Input PFL is
latched. see PFL.
Headphone Peak LED
The Headphone Peak LED is located just left of the Headphone Encoder.
This LED will illuminate red to indicate clipping in the headphone amplifier.
Monitoring without a visual indication of headphone clipping can mislead the
sound mixer into thinking that the output or return feeds are distorted.
664 User Guide and Technical Information
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