Another view of the third midhorn:
I will modify the horn a bit to make the mouth 3.5" x 3.5" vice the standard 4.5" x 4.5" because I am going to use a new JBL Pro 2169H 8" mid driver for the center channel speaker. This driver was designed for a 4" mouth horn. A 4" circular opening is essentially the same area as a 3.5" x 3.5" mouth. I doubt the 2169H driver will reach 300 Hz, but if it can get to 350 Hz I will be happy.
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