I'm not a 100% sure, but it probably involves convolution processing, as is used in some professional speakers - particularly for room optimization[0][1]. [0]

I'm not a 100% sure, but it probably involves convolution processing, as is used in some professional speakers - particularly for room optimization[0][1]. [0] http://www.genelec.com/products/dsp-products/glm-software/ http://www.genelec.com/products/dsp-products/glm-software/ [1] http://www.youtube.com/watch?feature=player_embedded&v=kwKxptMKbn8 http://www.youtube.com/watch?feature=player_embedded&v=k...