SoundField introduces its next level of microphone technology with the SoundField SP451 Surround Sound Processor. The SP451 expands the possibilities within the SoundField family to offer a complete 5.1 surround, stereo, mid/side and mono microphone package. The addition of the SP451 makes SoundField Microphones the lowest cost and most flexible multi-channel microphone systems available in the world.
- B-Format input metering with level control
- Front Width adjusts the angle of Front Left/Right mics by ±45 degrees
- Rear Width adjusts the angle of Rear Left/Right mics by ±45 degrees
- Rear Focus enables adjustment of the rear pair microphone polar patterns
This control adjusts the input level of all four B-Format channels simultaneously and is variable from full attenuation to a gain of +10dB. Normally this control should be used at or close to its 0dB position. Four 12-segment bargraph level meters are provided to monitor the levels of the W, X, Y and Z signals following the input gain control.
When the Front Width control is set to its CAL position, the angular positions of the Front Left and Right virtual microphones are at -45 and +45 degrees (relative to Centre) respectively. This control narrows or widens these angles symmetrically. The resulting range is from 0 degrees (Mono) to a very wide and exaggerated perspective of ±90 degrees relative to the Centre.
When the Rear Width control is set to its CAL position, the angular positions of the Rear Left and Right virtual microphones are at -135 and +135 degrees respectively. As above, this control narrows or widens these angles symmetrically, with a range from 180 degrees (a monophonic Rear Centre) to ±90 degrees relative to the Rear Centre position.
When set to its CAL position, the polar patterns of the virtual Rear microphone pair are as established by the MAP card. If the MAP card defines the rear mic positions as cardioids (default with the included card), the Focus control may be used to vary the patterns of these virtual mics from omni, through cardioid, to figure of eight. This degree of control can be very useful for adding additional spatial information to the rear surround channels, especially in ambient or freefield environments.