The SoundField SPS422B
Issue 1.7
User Guide
Page 10
CONTROLS
FRONT PANEL
Gain
: sets the gain of the mic amplifier in 10dB switchable steps from -30 to 0dB.
Fine Gain
: used to continually fine tune the gain of the mic amplifier over a 10dB range once the switchable
Gain range has been set.
End
: when in, sets the microphone to end-fire operation. In end-fire mode, the Pattern and Width
controls operate exactly as they do in the side-fire mode. See diagram for correct orientation on
page 6.
Inv
: for use with the side-fire mode to allow the microphone to be physically inverted without this
causing the left and right output signals to be transposed. This switch should be in when the
microphone is suspended over a sound source to keep the left/right perspective accurate.
Meters
: monitor the LEFT/RIGHT output levels or the Mid and Side signals when in M/S mode.
Filters
: when in, activates a 18dB per octave low cut filter acting at 80Hz. This affects both outputs and,
in addition to helping attenuate unwanted low frequency noise, it may also be helpful when close-
miking vocals.
Mid/Side
: when in, the controller provides MS format outputs which will need to be decoded using a
suitable matrix system. When out, the outputs provide a conventional LEFT/RIGHT (XY) format.
Pattern
: sets the polar pattern of the array. In effect, the control unit decodes the capsule information into
two ‘virtual’ microphones which may be continually varied as a pair from omni, through cardioid,
to figure-of-eight patterns. In M/S mode, the Pattern control sets the polar pattern of the
equivalent XY pair.
Width
: adjusts the angle between the two ‘virtual’ microphones. When set fully anticlockwise, the
SPS422B produces a mono output from both output sockets.
Headphones
: sets the volume level of the adjacent headphone output socket. The output is a standard, stereo
quarter inch jack (TRS) and is for use with headphones having an impedance of 400 ohms or
greater. It should be noted that the headphone output is not to the same high specification as the
main outputs and is only intended for confidence monitoring.
Pattern
Position
Inv
End
10
Mid/Side
Gain
Output
Input
Headphones
Width
Fine Gain
M/S
(MONO)
0
(MONO)
0
5
Filter
80Hz
SOUNDFIELD SPS422 STUDIO SYSTEM
LEFT
MID
SIDE
RIGHT
0
+20 O/L
-10
+10
0
0dB
-10
-20
-30
SOUNDFIELD
