Acoustic Lens

This is an acoustic lens designed to be placed in front of a midrange or tweeter speaker driver. It spreads the sound more evenly in the room eliminating most of the on-axis beaming effect. It does this by reshaping the planar wave front into a spherical one. I published a paper with the details here:
http://www.aes.org/e-lib/browse.cfm?elib=19881
I have uploaded both round and square flange versions. You can scale them and drill holes as needed to fit your driver. These were designed for