CSA is a method of increasing directivity at low frequencies without the need for very large arrays. The principle is the introduction of a second sound source at a defined distance behind the main source, which will cancel the sound energy radiated by it to the rear. Three, or multiples of three, subwoofers can be stacked with either the middle or bottom cabinet turned to face to the rear, creating an effective cardioid dispersion pattern. One of the D12 channels drives the reversed cabinet, usually the middle of the three, with the CSA function selected to achieve the desired phase and level for the rear-facing source.
This new functionality for the D12 is now available as a download from the website below, along with a white paper TI-330, which is published to provide more detailed CSA application information. Once again the Teutonic engine-at-the-back approach makes significant forward progress.
(Sarah Rushton-Read)
