Yes, but I think that's why you're confused. The distance between the individual speakers would be d, not N*d. Because your original comment was about this spac

Yes, but I think that's why you're confused. The distance between the individual speakers would be d, not N*d. Because your original comment was about this spacing, that's what I addressed in my answer. Obviously a larger effective aperture (either physical or synthetic) would be more effective at beam steering.