I suspect that the 'proprietary' equalization for the IDS arrays is just that they have measured a few units and can match them to a desired curve to achieve their target response. Thus the response and EQ is known and they can replicate it on future units with the dedicated EQ unit supplied with the $20K system. With a general purpose equalizer a DIY'er can do the same thing when they measure their unit and work to achieve their desired response. All the DIY'er would need to do is to record their set-up to have a 'proprietary' EQ response.