ARRI ALEXA 35 Body & PL Mount Set (LBUS) - Manual (Page 59)

Recording 59
12.7 Audio Recording
The camera supports to record up to 4 channels of linear PCM audio (24 bit, 48 kHz).
Audio Inputs
1
The AUDIO connector (1) is located on the right side of the
camera. It is a two channel +24 dBu line level audio input with
additional 12 V power output to supply microphone preampli-
fiers. This is the same 6-pin connector used on the ALEXA
Mini LF. Use the ALEXA Mini LF Audio connector with cable
(K2.0023988) to connect audio sources.
2 3
The dual gain internal microphones (2 = Internal Mic R, 3 = In-
ternal Mic L, seen from operator point of view) are located at the
camera front and can be used to record a reference track, some-
times called a “scratch track”. Some software tools can synchro-
nize the master sound with the image by using the reference
track. The gain of the internal microphones is fixed, with the left
microphone (3) having a gain of +18 dB and the right microphone
(2) a gain of 0 dB, to cover a wide audio level range.
1
2
The additionally available Audio Extension Module AEM-1 sup-
ports the use of either two balanced Mic/Line inputs (1) with
switchable +48 V phantom power, or one AES3 input (2). It is
docked directly to the rear interface of the camera. For more in-
formation please refer to the user manual of the module.
Audio Outputs
Active audio channels are embedded with a 1 to 1 channel mapping in the SDI stream and also output
via the headphone output of the MVF-2.
1
The headphones out (1) on the MVF-2 is a 3.5 mm TRS connec-
tor (headphone jack) which outputs all four audio channels with
a maximum power of 2.5 dBm. The camera's headphone routing
allows configuring which channels are output on the connector.