Build 21 v21.4.1
FEBRUARY 23, 2010 © 2007-2010 RED.COM INC.
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Reference signal level for Line inputs is 0dBu / 0.775 volts RMS / -20dBFS when operating at 0dB Input
Level. The maximum input signal that can be applied before the onset of input signal clipping is +18dBu /
6.5 volts RMS / - 2dBFS. This provides a guaranteed minimum of 18dB of input signal headroom above
reference, in combination with maximum Signal to Noise Ratio for the resulting 24-bit digital recording.
Peak Level Meter response to 0dBu (-20dBFS) Reference Level
NOTE: If sending the camera a TAPE level line output (-10dBu), adjust the Input Level to +10dB.
MICROPHONE LEVEL AUDIO INPUTS
The 24-bit digital recording level of each Microphone Level input is affected by the sensitivity of the at-
tached microphone and the Input Level setting applied to each of the audio pre-amplifiers.
Pre-amplifier Input Level range is +36dB to +54dB, with a default value of +36dB.
Choose an Input Level that aligns the input signal to the reference line drawn vertically through the cam-
era’s PPM, which indicates 0dBu. This setting provides a guaranteed minimum of 18dB of input signal
headroom above reference, in combination with maximum Signal to Noise Ratio for the resulting 24-bit
digital recording.
NOTE: The above notes apply to cameras configured with Rev B audio hardware. Cameras shipped
prior to Sept 15 2008 (and not yet upgraded to Rev B) were supplied with Rev A audio hardware,
with the following operational restrictions.
- You should always use a RED DIGITAL CINEMA XLR to mini-XLR adaptor cable, which provides
a -4dB pad, to achieve an appropriate input signal level.
- The 48 V Phantom Power source is automatically disabled on each power cycle.
- Low sensitivity phantom powered microphones may exhibit excessive noise, so consider an ex-
ternal +48V phantom power source, or use a dynamic microphone.
- Input Level range for Microphone Inputs is +36dB to +54dB.
- Input Level for Line Level inputs may not be adjusted.
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