Sound Devices MixPre-D - Manual (Page 10)

MixPre-D User Guide and Technical Information
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v1 .0 Features and specifications are subject to change . Visit www .sounddevices .com for the latest documentation .
The MixPre-D can drive headphones to dangerously high levels. Turn down the headphone gain before
selecting a headphone source to prevent accidental signal extremes.
Headphone Source Selection
The source of the headphone output can be selected by pressing the Headphone Controller.
The Headphone Source LED indicates what source program is present in the headphone
output.
Headphone Source LED Headphone Source
Off Main mixer output (Including Channel 3/4 input, if enabled)
Solid Blue Return signal
Flashing Blue Computer Audio (Only available in Interface Mode)
Metering
The MixPre-D features two large 16-segment LED output meters.
The meters use energy-efficient GaN LEDs, which are clearly vis-
ible in full sunlight. The MixPre-D output meters are unaffected
by shock, temperature, or humidity extremes.
The MixPre-D meters display input levels in a peak + VU format. The perceived loudness (VU) is
displayed on a bar graph, and the Peak signal on a dot above the VU. This metering format provides
the best of both VU and Peak metering by seeing the “loudness” of the signal while simultaneously
showing peaks.
To adjust the brightness of the meters (and other front panel LEDs) slide and hold the Slate Switch in
the Slate position and turn the Headphone Controller.
Tone Oscillator & Slate Microphone
A single, two-position switch controls both the slate microphone and the tone oscillator.
Slate Microphone
The built-in MixPre-D slate microphone is used to notate scenes from the mixer location. Its
audio performance is not suitable for critical recording applications; it should be used for
documenting scenes and for communication purposes only.
The slate mic uses the momentary right switch position. Hold the switch to the right to activate,
and release to turn off. Program audio is muted when the slate mic is active. The slate is sent to all
outputs.
Tone Oscillator
Tone is used to set gain between the MixPre-D and the next device in the signal path. The tone
oscillator uses the locking left position of the slide switch. Slide left to activate, and slide right
to deactivate.
The tone oscillator outputs a 1 kHz sine wave at 0 dBu to the outputs (when the outputs are set to
Line Level). Program audio is muted when tone is active. Tone is sent to all outputs. The MixPre-D
headphone outputs are attenuated when tone is activated.