When considering sub bass loudspeakers, should they be flown or ground stacked? If flown, should they be located right next to the mains, behind the mains, or somewhere between the main and side arrays? Should a cardioid configuration be implemented?
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Cardioid arrays fascinate me: they seem like they shouldn’t work. I mean sure, as soon as anyone gets active noise cancelling explained to them, they think, ‘why can’t this be implemented in larger spaces?’ But they also usually then very quickly run in to the wall which is that larger spaces have more listening points (more pairs of ears), and unless you have a one to one relationship between your audio sources and your listening points, its very difficult to implement active cancellation. And yet, cardioid sub arrays are reasonably effective in limiting low frequencies on stage without causing too much of a distortion problem for the audience. They’re not a perfect solution, of course, but I still find it miraculous how much they can cancel without muddying in a complex, open air environment. I think I also heard that BMW or maybe Mercedes is releasing active noise canceling in some of their cars as well. A car is hardly a thousand seat theatre, of course, but even that is impressive. It seems to me like it should be almost impossible, but I guess it’s just math. If someone who’s a better mathematician than me can figure it out, I’m happy to use their techniques.
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