Thanks, Wayne. I saw a picture of a line array someone had built using an array of inexpensive vertically positioned 2X5" piezo horns ($0.95 ea from Parts Express) and was thinking either they know something I don't know or that array is going to have some lobing issues. As I suspected, it's the latter, in addition to the questionable sound quality of a bunch of 95 cent piezo tweeters.Too bad. That means you still have to spend a bunch of money on drivers, especially the tweeter arrays, to build a good sounding pair of line arrays. Maybe we should all find a less expensive hobby, like restoring vintage automobiles or motorcycling:)