Soundfield MKV, User Manual

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SoundField MKV Issue 1.1 User Guide
Stereo Outputs
There are 2 stereo outputs from the control unit:
1 The main stereo output (left and right) from 2 x XLR 3 pin male sockets on the rear panel. These
signals are not subject to the monitor gain control.
2 A stereo jack socket on the front panel.
The stereo output circuits are fed with B-Format signals W, X and Y from the record amplifiers (and
hence the microphone) in the normal mode (Z, the height component, is not used in stereo except in
the SoundField circuits to effect elevation when required). If tape is pressed the circuits are
switched to the B-Format signals from the tape recorder via the B-Format play socket. On dub the
record level control may be introduced.
The main stereo output levels are approximately 0dBu programme level for 0dBu B-Format
programme inputs. Level adjustment is available in the dub mode. The monitor jack outputs may be
adjusted from off to +10dB relative to the main levels.
There are two further controls for when the unit is being used as a stereo microphone, or when
dubbing from the B-Format to Stereo, or (experimentally) when monitoring a B-Format recording in
stereo. These are polar patterns and angle, the latter allowing adjustment of the ‘angle of point’ of
the synthesised stereo pair of microphones.
Note 1
In standard B-Format the pressure-gradient signals X, Y (Z) are enhanced 3dB.
Examples of the inter-play of these controls and general polar pattern theory may be seen in
Figure 5
.
Note 2
The stereo output signals are in phase with the acoustic signals. That is, a pressure increase is
reproduced as a positive going omnidirectional component at the stereo outputs.
The B-Format signals are inverted. This has been done to retain compatibility with previous
SoundField microphones. This will only affect you if you wish to manipulate the B-Format signals
independently at the SoundField control unit.