@erik_squires
I've read all Meyer Sound's white papers on their line arrays and heard many line arrays from JBL, Nexo, and Meyer Sound. I'm familiar with the principles by which they operate. Virtually all the makers of HiFi line arrays use some sort of point-source type of dynamic driver, typical of an inch in size. Since these tweeters have frames of some sort, you're doing real good to mount them 1.5" on center. That distance dictates how well they're going to coherently couple and behave according to line arrays theory. At 1.5" centers they fall apart at 9kHz. Many don't even achieve spacing that close. PA rigs dodge than bullet by using complicated horns that attempt to emulate a ribbon. If the centers are 2" on center, the drivers decouple at just 6500Hz. That is NOT a line arrays. That's just a bunch of discombobulated drivers acting as a line of Independent, incoherent point sources. Golden Ear AMT type drivers suffer the measurable artifacts of their frame aperatures which cause each opening to behave as an individual source at their top ends. There's no way a pillar of any size domes can behave as a real line array throughout their passband.
I've read all Meyer Sound's white papers on their line arrays and heard many line arrays from JBL, Nexo, and Meyer Sound. I'm familiar with the principles by which they operate. Virtually all the makers of HiFi line arrays use some sort of point-source type of dynamic driver, typical of an inch in size. Since these tweeters have frames of some sort, you're doing real good to mount them 1.5" on center. That distance dictates how well they're going to coherently couple and behave according to line arrays theory. At 1.5" centers they fall apart at 9kHz. Many don't even achieve spacing that close. PA rigs dodge than bullet by using complicated horns that attempt to emulate a ribbon. If the centers are 2" on center, the drivers decouple at just 6500Hz. That is NOT a line arrays. That's just a bunch of discombobulated drivers acting as a line of Independent, incoherent point sources. Golden Ear AMT type drivers suffer the measurable artifacts of their frame aperatures which cause each opening to behave as an individual source at their top ends. There's no way a pillar of any size domes can behave as a real line array throughout their passband.

