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So would it be considered a throatless design? Do you know the negative angle?

Diffraction I would say like Cappelen says......though like I said I don't see how what they show is possible. Also, if they are rotating about a common axis (in this case I'll assume the horn throat...

I'm not sure I believe those measurements........there's no way a single 15 is going to have that kind of directivity from 150-500hz. Maybe there's a secret no one told me :o:

Cappelen - could you...