The JBL family of acoustical lenses was originally designed for stereophonic audio systems for motion picture theater applicatio
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![JBL midrange horns with acoustic lenses were popular with custom speaker makers. | Horns, Jbl, Audio design JBL midrange horns with acoustic lenses were popular with custom speaker makers. | Horns, Jbl, Audio design](https://i.pinimg.com/736x/ee/b8/7d/eeb87d1d590fe561b68036a36417b03c.jpg)