Quote Originally Posted by Altec Best View Post
All the cells for each horn are identical
OK, I misread, I thought you were implying that all horns had the same mouth size.
Quote Originally Posted by alancohen View Post
A picture looking squarely down (or up) from at least 6' away with a "normal" 50mm lens (so as not to distort) would do the trick. That would give the curve. That photo can then be printed on a program like TilePrint BlackFlight Models and scaled to any length. Patterns can be made off that. A bit of length would have to be added to account for the upward curve. Calculus guys can figure that out. I would wing it.
I would rather do a plot and have you draw it rather than try to photo and transfer. I know over at diyAudio Pano and someone else did a plot for the 1505 but I can't find it and besides that won't really help for the 1803 now would it?

This has to be done tomorrow as I don't seem to have a tape measure here but I will bring one tomorrow. I will also do lots of photos as mentioned.