Microphone level audio inputs – RED ONE OPERATION GUIDE User Manual

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Build 31 v31.6.16

NOVEMBER 28, 2011

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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.